Motion Grip Research Articles

Examining the changes in strength and mechanical property of dynamic stabilizers of the medial elbow joint through repetitive pitching

The flexor-pronator muscles (FPM) and their common tendon (CT) are essential in protecting the medial ulnar collateral ligament against elbow valgus stress during pitching. This study aimed to investigate the effect of repetitive pitching on FPM strength and CT stiffness. Fifteen healthy males (mean age: 21.8 ± 1.3-years-old) with over 5 years of baseball experience performed a series of 100 full-effort fastball pitches. We measured grip and isolated digital flexion strength of the second, third, and fourth digits before and after the pitching task. The decline in muscle strength was determined using the rate of change in muscle strength after pitching relative to that before. CT stiffness was measured using a hand-held myotonometer device at rest and during grip motion at 50% maximum voluntary contraction. The increase in CT stiffness during grip motion relative to rest was calculated as the augmentation rate of CT stiffness. Statistical analyses were performed to compare the changes in grip strength, digital flexion strength, and CT stiffness due to pitching. Additionally, the reduction rate of muscle strength was compared among various strength variables. Correlation coefficients were used to evaluate the relationships between the augmentation rate of CT stiffness after pitching and the reduction rate in any muscle strength. Grip and isolated digital flexion strengths decreased significantly after pitching (P < 0.01). The decline in muscle strength was significantly higher for all isolated digital strengths than that for grip strength (P < 0.05). CT stiffness was augmented with grip motion compared to that at rest pre- and post-pitching (P < 0.001). However, no change in CT stiffness due to pitching was observed, regardless of the grip motion (P > 0.05). Additionally, a lower augmentation rate of CT stiffness after pitching was moderately associated with the greater reduction rate of the second digital flexion strength (r = 0.607, P = 0.016) without other relationships. This study found reduced grip and digital flexion strength after pitching; with no change in CT stiffness. However, given the consequences of correlation analyses, individuals with a more prominent reduction in second digital flexion strength due to pitching were impaired in CT stiffness augmentation after pitching. Digital flexion strength represents the strength of the flexor digitorum superficial; therefore, this study suggests that forearm FPM, particularly the second digit of the flexor digitorum superficial, is an important factor for enhancing CT stiffness.

Reduction in motor error by presenting subthreshold somatosensory information during visuomotor tracking tasks

Weak sensory noise acts on the nervous system and promotes sensory and motor functions. This phenomenon is called stochastic resonance and is expected to be applied for improving biological functions. This study investigated the effect of electrical stimulation on grip force adjustment ability. The coefficient of variation and absolute motor error in grip force was measured during a visuomotor tracking task under different intensities of somatosensory noise. Depending on the style of force exertion, the grip movement used in the visuomotor tracking task consisted of force generation (FG), force relaxation (FR), and constant contraction (Constant) phases. The subthreshold condition resulted in significantly lower coefficient of variation in the Constant phase and motor errors in the FG and Constant phases than the no-noise condition. However, the differences among the other conditions were insignificant. Additionally, we examined the correlation between the motor error in the condition without electrical stimulation and the change in motor error induced by subthreshold electrical stimulation. Significant negative correlations were observed in all FG, FR, and Constant phases. These results indicated that somatosensory noise had a strong effect on subjects with large motor errors and enhanced the grip force adjustment ability. By contrast, subjects with small motor errors had weak improvement in motor control. Although the effect of subthreshold noise varies depending on the individual differences, stochastic resonance is effective in improving motor control ability.

Application of Stereo Vision to Control the Movement of the Robot Arm Towards the Position of Red Chilies

The trend of decreasing young workers in the agricultural sector needs to be anticipated by developing intelligent machines known as agricultural robots. This research aims to apply a stereo vision system to control the movement of the robot's grip towards the 3D position of the red chili fruit. The stereo vision system installed on the robot waist (joint-2) is used to capture plant images and process them using HSV masking filters and triangulation principal to obtain the 3D center point position of the fruit. The robot joint movement is calculated using geometric based inverse kinematics. The research results show that the average accuracy of the stereo vision system is 93.9 %. The average grip positioning accuracy is 95.6 % to the actual chili fruit position and 98.5 % to the stereo vision calculation value. The average stability of the stereo vision values is 99.5 %, while the average positioning stability of the robot's grip is 99.6 %. Time consumption for image processing is 0.053 s while time consumption for robot grip movement is 9 s. Therefore, the stereo vision system can be used to control robot's grip movement with a good accuracy. Keywords: Red chili fruit, Robot arm, Stereo vision, Three-dimensional position.

Ultrasound-guided fasciotomy in forearm chronic exertional compartment syndrome: Preliminary results in 12 cases

IntroductionForearm chronic exertional compartment syndrome is a rare condition in athletes and musicians who perform repeated prolonged forced gripping movements. It mainly affects young men, and presents with cramp-like pain, beginning on the anteromedial side of the forearm and progressively extending to the entire circumference, and may be associated with muscle weakness and neurologic symptoms. The objective of this study was to report preliminary results of ultrasound-guided fasciotomy in the treatment of forearm chronic exertional compartment syndrome. Material and methodsA single-center retrospective observational study was conducted. Forearm chronic exertional compartment syndrome was diagnosed on clinical presentation and pathological intramuscular pressure measurement, defined as >30 mmHg at 1 min after effort. The series comprised 7 men, with bilateral involvement. Mean age was 30 years. All patients were motorcyclists. The mean preoperative intramuscular pressure at 1 min after effort was 60.75 mmHg (range: 30−81 mmHg). The main study endpoint was change in pain on visual analogic scale. Secondary endpoints comprised patient satisfaction, change in competitive sports level, and time to return to sport. Complications were noted. ResultsSix patients (12 forearms) were evaluated. Mean follow-up was 22.5 months (range: 3–48 months). Mean pain rating was 7.3/10 (range: 6–9) preoperatively, and 0/10 postoperatively. All patients were satisfied with the procedure. Mean time to return to sports was 25.5 days (range: 21–30 days). No patients decreased their competitive sports level after the procedure. One patient presented a postoperative hematoma, not requiring surgery. ConclusionUltrasound-guided fasciotomy in the treatment of Forearm chronic exertional compartment syndrome is an innovative technique with promising preliminary results. Level of EvidenceIV; retrospective cohort.

Exploring Kinematic Bifurcations and Hinge Compliance for In‐Hand Manipulation: How Could Thick‐Panel Origami Contribute?

Origami‐inspired mechanisms have found significant applications in end effector design. So far, the exploration of thick‐panel origami has been relatively limited, but it is worth noting that the incorporation of rigid thick panels can introduce unique mechanical properties, showcasing great potential in addressing manipulation challenges. Our previous work has developed a gripper from thick‐panel waterbomb origami, which can pick up a variety of daily objects. Based on the same prototype, this article extends the gripper's function from grasping to in‐hand manipulation, which is attributed to the kinematic bifurcations and compliance of thick‐panel origami. A kinematic study is carried out to investigate the gripper's bifurcated motion modes. The hinge compliance is also taken into account to enhance the gripper's motion dexterity. Theoretical analysis and experiments are conducted to demonstrate both features, thereby paving the foundation for achieving dexterous motions with a simplified control strategy. Aided by a differential mechanism, the gripper can effectively interact with objects with the actuation inputs from only two motors. Objects including balls, cuboids, and cones are explored for in‐hand manipulation under different motion modes, showing varied trajectories. With the integration of tactile sensors at the fingertips, we have also revealed the gripper's potential for classification tasks.

Arduino Based Pickup and Drop Robot

A robotic arm is designed using Arduino to pick and place the objects via user commands. It will pick and place an object from source to destination safely. The soft catching gripper used in the arm will not apply any extra pressure on the objects. The robot is controlled using android based smartphones through Bluetooth. Based on the commands given by the user the robot moves accordingly. At the receiver end there are four motors interfaced with the micro controller. Two for the vehicle movement and the remaining two are for arm and gripper movement. Blue control application is used for the controlling of robot Keywords: Six Axis, Bluetooth Module, Micro-controller, Stepper Motor.

Structural and dynamical aspect of DNA motif sequence specific binding of AP-1 transcription factor.

Activator protein-1 (AP-1) comprises one of the largest and most evolutionary conserved families of ubiquitous eukaryotic transcription factors that act as a pioneer factor. Diversity in DNA binding interaction of AP-1 through a conserved basic-zipper (bZIP) domain directs in-depth understanding of how AP-1 achieves its DNA binding selectivity and consequently gene regulation specificity. Here, we address the structural and dynamical aspects of the DNA target recognition process of AP-1 using microsecond-long atomistic simulations based on the structure of the human AP-1 FosB/JunD bZIP-DNA complex. Our results show the unique role of DNA shape features in selective base specific interactions, characteristic ion population, and solvation properties of DNA grooves to form the motif sequence specific AP-1-DNA complex. The TpG step at the two terminals of the AP-1 site plays an important role in the structural adjustment of DNA by modifying the helical twist in the AP-1 bound state. We addressed the role of intrinsic motion of the bZIP domain in terms of opening and closing gripper motions of DNA binding helices, in target site recognition and binding of AP-1 factors. Our observations suggest that binding to the cognate motif in DNA is mainly accompanied with the precise adjustment of closing gripper motion of DNA binding helices of the bZIP domain.

Correlation of Body Mass Index and Work Profile on Hand Grip Strength and Endurance in Healthy Adults

Background and need of research: Hand Grip Strength (HGS) is an integral part of performing precise and refined fine motor activities. Many professions necessitate lifting and holding heavy loads with a proportionately static grip or repetitive or forceful gripping movements. Hence it is important to consider measurement of handgrip endurance (HGE) as an important component of assessment of physical performance. Most of studies have shown that HGS and BMI is associated with mortality and cardiovascular disease. So, need of this study is to fulfill the lacunae of literature. Method: A cross-sectional study-conducted on 80 healthy adults(age:18-40) after obtaining Institutional Ethical Committee clearance. Participants who met with the inclusion criteria were invited for study. BMI was calculated using the formula weight(kg)/height(m)2.HGS and HGE were measured in office worker and labourer using hand grip dynamometer. Results: Mean age, BMI, strength and endurance of office worker is (32.78+5.96), (26.15+5.36), (29.04+9.34), (44.63+28.53) and labourer is (32.47+4.46), (25.35+3.33), (37.26+8.57), (32.82+29.44) respectively. Spearman correlation test was used for analysis. Significant negative correlation (r=-0.507, p&lt;0.05) is found between labourer BMI and HSG and very weak correlation found between BMI and HGE (r=-0.010, p&gt;0.05). Weak and very weak correlation found between office worker’s BMI, HGS and HGE (r=-0.274, p&gt;0.05 and r=0.110, p&gt;0.05) respectively. Conclusion and clinical implication: There is significant negative correlation found between BMI and grip strength in labour group. This result supports that HGS can be effective tool for predicting physical fitness. Moreover, through normative value of HGS, clinician can detect low level of physical fitness at early stage in order to prevent future health problems. Keywords: BMI, hand grip strength, hand grip endurance, work profile

Pick and Place Robotic Arms Movement Controlled by Android Wirelessly

Abstract: The paper describes the design and implementation of pick and place arm Robot and its movement Control by realization of the mobile application for the Android operating system which is focused on using wireless Bluetooth technology. Prototype of a mobile robot is necessary for the development of the application. In this paper, Graphical user Interface based touch screen operation in the Android Application acts as a transmitter and sends commands to the receiver to control the movement of the robot either to move forward, backward and left or right. We can also operate the Robotic arm like holding, releasing an object and movement of robot hand upwards and downwards etc. Here also in this application we have a interfaced an android phone as a prototype for wireless camera so that the person controlling it can view operation of the arm and gripper remotely. Four motors are interfaced to the microcontroller where two motors are used for arm and gripper movement of the robot while the other two motors are used for the body movement. The receiver end Bluetooth device is fed to the Arduino to drive DC motors via motor driver IC

ON COMPETING PROCESSES AT THE INCLUSION – MATRIX BOUNDARIES DURING STEEL ROLLING

Purpose of the work – to study of the processes that determine the interaction of non-metallic inclusions and the steel matrix during steel rolling. Methods. The behavior of inclusions was studied during hot rolling of steels 08Yu, 08T, 08kp, NB-57, 08GSYUTF in the temperature range of 1 200...900 °C and cold rolling with degrees of deformation of 35...75 %. The study of hot slipping along the boundaries of the inclusion − matrix was observed during high-temperature (900...1 200 °C) deformation by stretching in a vacuum on the IMASH-5S installation with a gripper movement speed of 1 680 mm/min. According to the study of slipping, steel samples were stretched in a vacuum at temperatures of 25...900 °С on the IMASH-5S installation with a gripper movement speed of 2 000 mm/min. On the surface of the samples, using the PMT-3 device, reference points were applied near the 0° and 90° inclusion poles on both sides of the inclusion − matrix boundary. Research methods are given in works [10; 11]. Identification of inclusions was carried out by metallographic (Neophot-31), petrographic and micro-X-ray spectral (MS-46 Cameca) methods. Results. It is shown that during plastic deformation, there is an interaction between non-metallic inclusions and the steel matrix, which determines their joint plastic shape change and is associated with the development of competing processes at the inclusion − matrix interphase boundaries: interphase friction and slipping (hot or cold depending on the deformation temperature). The mechanisms of these processes are determined depending on the deformation conditions and the level of plasticity of non-metallic inclusions and the steel matrix. Scientific novelty. The peculiarities of interphase friction and hot and cold slipping along the inclusion − matrix interphase boundaries of steel under different conditions of plastic deformation have been established. It is shown that the mechanisms of each of these processes depend on the temperature regime of deformation, the level of plasticity of the inclusions and the steel matrix, as well as on the structure of the inclusion − matrix boundaries, which determines the possibilities of movement and interaction of interfacial defects. It is shown that the specified processes determine the level of plasticity of the inclusion − matrix boundaries and significantly affect the nature of the change in shape of the inclusions and their redistribution in the steel matrix during steel rolling, which inevitably affects the technological plasticity of steels. Practical significance. The use of the results obtained will make it possible to develop technologies for producing steels with regulated types of nonmetallic inclusions, which will significantly increase their technological characteristics, as well as prevent the formation of various kinds of defects during the processing of steels by pressure of products.

Comparison of Data Classification Results in Serious Gaming for Rehabilitation of Rheumatoid Arthritis.

Rheumatoid arthritis is a common disease which affects the joints of the wrist, fingers, feet and in the end the daily activities. Nowadays, gestures and virtual reality are used in many activities supporting recovery, games, learning as technology is present more and more in different fields. This paper presents results related to the grip movement detected by a Leap Motion device using binary classification and machine learning algorithms. We used 2 models to compare the results: Naïve Bayes and Random Forest Classifier. The metrics for comparison were: accuracy, precision, recall and f1-score. Also, we create a confusion matrix for a clear visualization of the results. We used 5000 data to train the algorithm and 1500 data to test. The accuracy and the precision were bigger than 97% in all the cases.

Ion trap and release dynamics enables nonintrusive tactile augmentation in monolithic sensory neuron.

An iontronic-based artificial tactile nerve is a promising technology for emulating the tactile recognition and learning of human skin with low power consumption. However, its weak tactile memory and complex integration structure remain challenging. We present an ion trap and release dynamics (iTRD)-driven, neuro-inspired monolithic artificial tactile neuron (NeuroMAT) that can achieve tactile perception and memory consolidation in a single device. Through the tactile-driven release of ions initially trapped within iTRD-iongel, NeuroMAT only generates nonintrusive synaptic memory signals when mechanical stress is applied under voltage stimulation. The induced tactile memory is augmented by auxiliary voltage pulses independent of tactile sensing signals. We integrate NeuroMAT with an anthropomorphic robotic hand system to imitate memory-based human motion; the robust tactile memory of NeuroMAT enables the hand to consistently perform reliable gripping motion.

Development of a wearable cybernic glove that enables object grasping and gripping force measurement with open finger pad

Patients with hand paralysis have motor and sensory dysfunction of their hands. They can neither flex/extend their fingers nor feel the gripping force. To enable the gripping motion with sensory information, sensory information has to be acquired simultaneously as the fingers are assisted. Since the skin plays a role in increasing friction with the grasped object in addition to acquiring sensory information, it is important for the skin to be in direct contact with the object. Therefore, it is necessary to enable gripping motion and measure the gripping force with an open finger pad. In this study, a wearable system was developed to enable gripping motion and gripping force measurements with an open finger pad. A tendon-driven finger-assist glove assisted the flexion/extension of the fingers and adduction/abduction of the thumb; moreover, a sensor was developed to estimate the fingertip force by measuring the lateral expansion force of the finger tissue. We conducted an evaluation experiment for the developed sensor and object grasping experiments for the developed wearable system with the sensor. The root mean square error (RMSE) in force estimation was approximately 0.2 N. In addition, the system could assist the motions of the thumb/index/middle finger in grasping objects.

Android Based Vehicle with Robotic Arm

Abstract: We have seen that workers are facing various problems when working in mass production factories, most famously in the manufacturing of cars and many more applications. So that we came up with the solution to tackled these problems. Witha robotic arm and a gripper technology is used to pick and place things. It can be used for the selection and placement of objects according on the situation. Wireless operation of this arm is mounted on the top of the vehicle using with an Android smartphone. The android phone acts as the controller and is used to transfer Bluetooth signals. The vehicle can be moved forward, backward, left, and right using these commands. Two motors are employed at the receiver, which are used to move the vehicle and the Servo motors are used to handle the arm and gripper movements. The android phone acts as a remote to control the vehicle. With the help of Bluetooth technology communications can be established with the vehicle &amp; a robotic arm via Arduino. T the driver IC are used to control the required motors after receiving the commands from Android application. Any Android device will be able to control the vehicle remotely. This device with robotic device may help industries and can used in domestic application such that it will reduce human effort

Athletes in sporting events with upper-body gripping movements have greater handgrip strength than those in sporting events that prioritize the lower body.

Evidence suggests that acquiring a high level of handgrip strength early in life and maintaining that strength throughout life may be important for health. In addition, it is thought that sports activities performed during the developmental period are effective in improving handgrip strength, but it is unknown what types of sports are more effective. As a first step, we conducted a cross-sectional study to compare handgrip strength across different sports (upper-body gripping sports vs. lower body) in early adulthood. We used the Juntendo Fitness Plus Study data from 1973 to 2018 and selected two types of sporting events with matching physiques (soccer, baseball, and kendo) but different degrees of gripping. Data on 7344 male first-year sports university students included 1127 soccer, 297 Kendo, and 698 baseball players. Those in the lower body-only (soccer) sports had -3.78 (95% CI: -4.27, -3.29) kg lower handgrip strength than those in the lower + upper (kendo and baseball). Comparing each individual sport found that each sport was different from each other with Kendo > Baseball > Soccer (between each sport, p < .001). In addition, the difference between sports has become greater across time. In early adulthood, handgrip strength is greatest in those participating in sports with upper-body movements compared to those participating in sports that mainly involved lower-body movements. The three sports we selected are natural activities that do not directly train handgrip strength. Therefore, sport may be one potential method to improve low handgrip strength in children/adolescents during the developmental period.

Математическая модель, алгоритм формирования вектора состояния и техническая реализация многокоординатного задающего органа внутрикамерных манипуляторов

The purpose of the study is a development of a mathematical model and an algorithm for the calculation of the state vector of a multi-axes delta-type control joystick for moving special purposes arm manipulators by a human operator in the loop. Research methods. The paper considers the existing methods of remote control of intrachambers special purpose arm manipulators with a human operator in the control loop, identifies the advantages and disadvantages of existing solutions. The task of synthesizing the optimal control stick to ensure driving of the manipulator in 3D-space was set. Today, nuclear industry enterprises widely use hermetic chambers in which copy-type electromechanical manipulators are installed. The manipulation system includes an arm manipulator installed directly in a sealed chamber, and its kinematically similar control arm. The operator manually moves the control arm, the trajectory of which is repeated inside the chamber by the arm manipulator. Taking into account moral and physical obsolescence, the introduction of modern approaches to the human-machine interaction is required. The paper proposes a mathematical model for calculation the state vector (linear and angular coordinates) of a delta-type control stick from measured information about the relative angular position in its rotational kinematic pairs. Results of the study. An algorithm for calculating the coordinates of the handle of the control stick is synthesized based on a priori information about the relative position of the elements in the delta-mechanism. Taking into account the additional discrete and proportional controls located on the handle of the control stick, the proposed algorithm and its practical implementation make it possible to introduce effective manipulator control modes. Conclusion. The main results of the work include a mathematical model and an algorithm for generating the state vector of the delta-type control stick, which allows the operator to form the linear and angular velocity vectors of the arm manipulator and its gripper movement by one hand. The technical implementation of the control stick and algorithm, as well as its test operation with a dual arm manipulator system, showed the high efficiency of the proposed solutions.

Development of lifting-type robot hand and automation of rotor gripping motion

Development of lifting-type robot hand and automation of rotor gripping motion

A hydraulic soft microgripper for biological studies

We have developed a microscale hydraulic soft gripper and demonstrated the handling of an insect without damage. This gripper is built on Polydimethylsiloxane (PDMS) with the soft material casting technique to form three finger-like columns, which are placed on a circular membrane. The fingers have a length of 1.5mm and a diameter of 300µm each; the distance between the two fingers is 600µm of center-to-center distance. A membrane as a 150µm soft film is built on top of a cylindrical hollow space. Applying pressure to the interior space can bend the membrane. Bending the membrane causes the motion of opening/closing of the gripper, and as a result, the three fingers can grip an object or release it. The PDMS was characterized, and the experimental results were used later in Abaqus software to simulate the gripping motion. The range of deformation of the gripper was investigated by simulation and experiment. The result of the simulation agrees with the experiments. The maximum 543 µN force was measured for this microfluidic-compatible microgripper and it could lift a ball that weighs 168.4mg and has a 0.5mm diameter. Using this microgripper, an ant was manipulated successfully without any damage. Results showed fabricated device has great a potential as micro/bio manipulator.

FEATURES OF THE CRACKS’ FORMATION IN HETEROPHASE INCLUSIONS OF THE “EUTECTICS OF INCLUSION – MATRIX” TYPE

The purpose of the article − to study of crack nucleation features in heterophase inclusions of the “eutectic of inclusion-matrix” type during steel deformation. Methods. The research was conducted after deformation for a number of different grades steel samples in the temperature range of 20...1 200 °С on Instron-1195 and IMASH-5C with special grippers, with a gripper movement speed of 1 680 mm/min. Research methods were used: petrography, micro-X-ray spectral analysis (Cameca MS-4, Nanolab-7), optical microscopy (Neophot-21). Results. It is found that the variety of phases composing the heterophase inclusions of the "eutectic of inclusion-matrix" type leads to their different behaviour under conditions of plastic deformation. It is shown that the nucleation of brittle or viscous microcracks occurs along the internal interfacial boundaries between the metal matrix and the second phase of the eutectic. It is defined that the cracks’ nature is determined by the plasticity level of the inclusion phases and the deformation temperature. It is shown that the critical degrees of samples’ deformation, at which appreciable microcracks along the internal interphase boundaries appeared, depend on the temperature and the nature of the inclusion phase “eutectic of inclusion – matrix”. It is found that the values of deformation critical degrees determine the level of cohesive strength for internal interphase boundaries in heterophase inclusions “eutectic of inclusion – matrix”. Scientific novelty. The features of microcracks nucleation in heterophase inclusions of the “eutectic of inclusion − matrix” type are determined. It is shown that the nature of the microcracks formed along the interphase boundaries depends on the temperature, plasticity level and combination conditions of brittle and plastic phases in inclusions of the “eutectic of inclusion − matrix” type as well as on the deformation temperature. It is shown that the critical degrees of steels deformation, when microcracks appeared along the internal interphase boundaries, determine the cohesive strength of these boundaries and depend on the temperature and the nature of the inclusion phase “eutectic of inclusion − matrix” type. Practical value. The use of the obtained results will make it possible to develop technologies for producing steels with regulated types of non-metallic heterophase inclusions that will allow to increase considerably their technological and operational characteristics, and also to prevent the formation of various defects during steel pressure treatment and product operation.

FEATURES OF THE CRACKS’ FORMATION IN HETEROPHASE INCLUSIONS OF THE “DISPERSED PHASES IN A NON-METALLIC MATRIX” TYPE

The purpose of the article − to study of crack nucleation features in heterophase inclusions of the “dispersed phases in a non-metallic matrix” type under the conditions of steels’ plastic deformation. Methods. The research was conducted after deformation for a number of different grades steel samples in the temperature range of 20...1 200 °С on Instron-1195 and IMASH-5C with special grippers, with a gripper movement speed of 1 680 mm/min. Research methods were used: petrography, micro-X-ray spectral analysis (Cameca MS-4, Nanolab-7), optical microscopy (Neophot-21). Results. It is shown that the variety of phases composing the heterophase inclusions "dispersed phases in non-metallic matrix" leads to their different behaviour under plastic deformation conditions. At the same time, the nucleation of brittle or viscous microcracks occurs along the internal interphase boundaries between the "non-metallic" matrix and the dispersed particles of the second phase. The cracks’ character near the inclusions determined by the plasticity level of “matri” and dispersed phases of inclusions and the deformation temperature are revealed. The determined critical degrees of samples’ deformation, upon reaching which appreciable microcracks along the internal interphase boundaries occurred, were depend on temperature and the nature of the “dispersed phases in a non-metallic matrix” inclusions. Scientific novelty. The features of microcracks nucleation associated with heterophase inclusions of the “dispersed phases in non-metallic matrix” type with different combination of brittle and plastic phases during steels’ deformation are determined. The types of microcracks occurring in inclusions of the “dispersed phases in the non-metallic matrix” type and the locations of their formation have been determined. It is shown that the values of the deformation critical degrees determine the level of cohesive strength for internal interphase boundaries in heterophase inclusions “dispersed phases in a non-metallic matrix” at different deformation temperatures. Practical value. The use of the obtained results will make it possible to develop technologies for producing steels with regulated types of non-metallic heterophase inclusions that will allow to increase significantly their technological and operational characteristics, and also to prevent the formation of various defects in the steels' treatment by pressure and the operation of products.