Lower Impact Forces Research Articles

Porous Magnetic Soft Grippers for Fast and Gentle Grasping of Delicate Living Objects.

Magnetic soft grippers have attracted intensive interest due to their untethered controllability, rapid response, and biological safety. However, manipulating living objects requires a simultaneous increase in shape adaptability and gripping force, which are typically mutually exclusive. Increasing the magnetic particle content enhances the magnetic strength but also increases the elastic modulus, leading to low adaptability and high impact force. Here, a porous magnetic soft gripper (PMSG) is developed by integrating a porous structure into a magnetic silicone elastomer. The design of porous hard magnetic composite is characterized by high magnetization, low modulus, and rough surface. It offers the PMSG good compliance, high gripping force, and low impact force at fast gripping. The PMSG is capable of performing a variety of tasks, including the fast and gentle grasping of delicate living objects. The study provides insight into the design of novel magnetic grippers and may offer a promising outlook for biomedical or scientific applications in the manipulation of delicate organisms.

Experimental and numerical investigations of the impact resistance of socket and pocket connections for precast bridge columns

This study investigates the dynamic performance of precast bridge columns under pendulum impact testing, including socket connection, pocket connection, and cast-in-place (CIP) columns. The study focuses on comparing the impact behavior of CIP and precast columns regarding failure modes, impact force-time, and deflection-time histories. Furthermore, the mechanism by which the socket or pocket connection configurations affect the impact resistance of the precast columns is discussed. The results indicate that the development of cracks in the precast and CIP columns is consistent under the same impact conditions. Notably, the shear resistance mechanisms and failure modes vary significantly at the bottom of the two columns. For the precast specimens, substantial local damage occurs at the connections with consecutive impacts. Specifically, punching shear failure is observed at the pocket connections, whereas the connection sections of the socket columns may pull out from the grooves. Local damage to the column-footing connections reduces the global stiffness of precast columns, leading to higher deformation, greater residual displacements, and lower impact forces than those of CIP columns. A simplified finite element modelling method is proposed to simulate the characteristics of precast column connections, and its accuracy is verified using the test results. The numerical findings show that increasing the friction coefficient at the connection interface promotes the formation of diagonal compression struts within the connection, effectively resisting impact loads and preventing excessive shear stress produced by sliding at the interface. Furthermore, amplifying the minimum embedment depth of the socket-connected precast column to 1.0 D is recommended to ensure safe performance under impact loading.

Pillar height regulated droplet impact dynamics on pillared superhydrophobic surfaces

Superhydrophobic surfaces that promote rapid droplet detachment have many significant engineering applications including self-cleaning, anti-icing, drag reduction. Adding macrotextures to superhydrophobic materials can markedly modify the dynamics of water impacting them, either by triggering a non-axisymmetric, center-assisted recoil or inducing pancake-like bouncing. However, the effect of pillar heights on superhydrophobic surfaces has received limited attention. Here, we have systematically investigated the role of the size ratio of pillar height-to-droplet radius (Q) on bouncing dynamics, including spreading, penetrating depth, contact time, bubble entrapment, impact pressure, and impact force, through numerical simulations. We show that droplet impact on superhydrophobic surfaces can generate two modes of bubble entrapment: one is an impinging cavity bubble, and the other is a recoiling cavity bubble, depending on Q. Furthermore, for low Weber number (We), droplet impacts may generate three peaks of impact force for superhydrophobic surfaces with high Q. For high We, only two peaks of impact force are generated during a droplet striking the superhydrophobic surface. However, the secondary peak in the impact force will weaken or may even disappear completely as Q increases, which was hitherto unknown. Interestingly, we also observe that despite lower impact force during droplet recoil compared to droplet impact, higher penetration depths are more easily achieved during the recoil stage. These findings shed light on the role of pillar heights in droplet impact dynamics, offering valuable insights for designing superhydrophobic surfaces.

Cell Design in Crash Box to Increase the Energy Absorption Efficiency

Researchers have completed many methods to increase the ability of thin tubes to absorb impact energy. Various methods are proposed covering the use of different materials, including new designs, which are expected to improve their performance. This study aims to obtain an Impact Energy Absorber (IEA), which has a low peak impact force and has better crash force efficiency (CFE), energy absorption (EA), and specific energy absorption (SEA). This study made a design change from an empty square tube to a square tube with a cell structure inside. A thin-walled box in the form of a box with a base size of 50 mm x 50 mm without a lid and a height of 150 mm with a thickness of 2 mm was used in this study. A load strikes the tube from the axial direction with a speed of 100 m/s while the other end is supported by fixed support. Deformation, impact force, and absorbed energy were recorded in all types of specimens. The results showed an increase in the reaction force between boxes that were given cells compared to empty ones. While the addition of cell variations from 1 to 2 did not experience a significant change in the impact force. The maximum deformation decreases with the number of cells, while the energy absorbed per unit length increases. The deformation pattern changes due to cells in the box because there is an obstacle when it is deformed towards the outside of the tube. The results of this study are considered in manufacturing high-speed crash boxes.

Dynamic responses of steady-state transition structures under impact loading

Advancements in materials science and mechanical system have spurred widespread investigation into non-traditional structures. In particular, engineers have shown interest in steady-state transition structures with phase transition properties. In this paper, a three-dimensional steady-state transition structure was established using the genetic algorithm and three-dimensional expansion, on which the low-velocity impact tests were carried out. Force response and energy absorption of the steady-state transition structures under impact were studied. From the force response and energy absorption curves, it can be seen that the steady-state transition structures absorb and store portion of impact energy temporarily, gradually releasing it after impact peak. This unique energy behavior results in a steady state transition structure with a long impact response time and a low peak impact force under impact. In addition, investigation into energy transfer within these structures reveals that energy oscillations occur among multilayered bistable surfaces during steady-state transitions, further improving the energy dissipation. Further, the dynamic response and damage modes of the honeycomb structure and the steady state transition structure were compared, showing that the damage mode of the steady state transition structure under the impact is an overall damage, in contrast to the penetration damage of the honeycomb structure. Notably, the steady-state transition structures showcase a higher proportion of elastic strain energy during impacts, effectively delaying structural damage onset, and dispersing impact energy, thus enhancing impact resistance. In light of these findings, the demonstrated behavior of steady-state transition structures in absorbing and dissipating impact energy showcases their potential as promising avenues for the development of more effective impact protection strategies.

1042-P: Qualitative Study—Provider Awareness and Attitudes towards Type 1 Diabetes Antibody Screening

Background: This study explores awareness and attitudes of endocrinology providers toward type 1 diabetes (T1D) autoantibody screening and identifies perceived benefits and barriers to screening. Methods: Three focus groups were conducted with thirteen eligible endocrinology providers recruited from the T1D Exchange Quality Improvement Collaborative. Focus groups were transcribed, coded, and analyzed using NVivo qualitative software. A force field analysis was conducted, analyzing high, medium, and low impact forces that were identified in the study. Results: All providers considered themselves “pro-screening” and comfortable discussing autoantibody screening with patients. High impact driving forces included early diabetes management, DKA prevention at diagnosis, and clinical guidance and diagnosing abilities. Medium and low impact forces included awareness and clarity of diagnosis, opportunity to get involved in research, and results for insurance approval. High impact restraining forces included anxiety of diagnosis for patients and family members, cost of screening, and staffing or clinic limitations. Medium and low impact forces included time and coordination for patients and families, mildly invasive procedure, and insurance coverage. Conclusion: Findings highlight perceived benefits and barriers to autoantibody screening, illustrating provider insight and awareness. Disclosure E.L.Ospelt: None. K.Obrynba: None. O.Ebekozien: Advisory Panel; Medtronic, Research Support; Eli Lilly and Company, Dexcom, Inc. H.Hardison: None. N.Rioles: None. N.Noor: None. G.Nelson: None. C.J.Levy: Advisory Panel; Dexcom, Inc., Research Support; Abbott Diabetes, Dexcom, Inc., Insulet Corporation, Tandem Diabetes Care, Inc., T1D Exchange. A.M.Mckee: Advisory Panel; Medtronic, Novo Nordisk. Z.Antal: None. J.C.Wong: Research Support; Dexcom, Inc., Tandem Diabetes Care, Inc.

Increased hip flexion gait as an exercise modality for individuals with obesity.

Exercise is a critical element for the management of body weight and improvement of quality of life of individuals with obesity. Due to its convenience and accessibility, running is a commonly used exercise modality to meet exercise guidelines. However, the weight-bearing component during high impacts of this exercise modality might limit the participation in exercise and reduce the effectiveness of running-based exercise interventions in individuals with obesity. The hip flexion feedback system (HFFS) assists participants in meeting specific exercise intensities by giving the participant specific increased hip flexion targets while walking on a treadmill. The resulting activity involves walking with increased hip flexion which removes the high impacts of running. The purpose of this study was to compare physiological and biomechanical parameters during an HFFS session and an independent treadmill walking/running session (IND). Heart rate, oxygen consumption (VO2), heart rate error, and tibia peak positive accelerations (PPA) were investigated for each condition at 40% and 60% of heart rate reserve exercise intensities. VO2 was higher for IND despite no differences in heart rate. Tibia PPAs were reduced during the HFFS session. Heart rate error was reduced for HFFS during non-steady state exercise. While demanding lower energy consumption compared to running, HFFS exercise results in lower tibia PPAs and more accurate monitoring of exercise intensity. HFFS might be a valid exercise alternative for individuals with obesity or individuals that require low-impact forces at the lower limbs.

Numerical investigation on the dynamic behavior of UHPFRC strengthened rocking concrete bridge piers subjected to vehicle collision

The nonlinear dynamic responses of UHPFRC-strengthened monolithic and rocking concrete bridge piers with different configurations including the rocking monolithic pier (RMono), rocking segmental piers with four (RSeg4), and eight (RSeg8) are numerically investigated in this study. Different rocking piers subjected to vehicle collisions with variations of the UHPFRC cover thickness (tU), length (LU), and its strengthening scheme are investigated using finite element (FE) simulations in LS-DYNA. From the evaluation of the piers constructed with normal concrete (NC) under different Vimp, it was found that the segmental piers experience higher recoverability and lower peak impact and internal forces compared to the Mono and RMono piers, however, they suffered more severe concrete spalling at the corners and edges of the segments due to the segment’s slippage. Also, the RMono pier demonstrates better impact resistance with a displacement recoverability of 55% against a high-velocity vehicle impact with Vimp = 140 km/h and withstands collapse compared to the total collapse of the Mono and segmental piers. In addition, it is found that the increase of tU from 80 mm to 160 mm had a more positive effect on the impact resistance and damage mitigation of the Mono and the RMono piers than its effect on the performances of segmental piers. As a result, the residual displacement of the RMono pier decreased by 60% while enhancing its residual shear force by 33%, and the residual bending moment by 64%. Also, the residual displacements of the RSeg4 and RSeg8 piers decreased by 75% and 80%. The Mono pier with Scheme-2 and a UHFRC cover of 80 mm resulted in lower impact force by 42%, lateral displacement by 43%, peak shear force by 22.5%, and bending moment by 31% than those of Scheme-1. Besides, the use of UHPFRC cover for the column-footing and column cap-beam connections in addition to the whole height of the RMono pier (Scheme-3) significantly reduces the concrete spalling damage level at the column base. Moreover, it is found that the use of UHPFRC for all the edges of the column segments in addition to the bottom zone of the RSeg4 and RSeg8 piers (Scheme-4) considerably mitigates the spalling damages and enhances the recoverability of the segmental piers by 67% and 63%, respectively compared to performances of these piers when using Scheme-1 and Scheme-2.

Research on cleaning technology and damage assessment of single-stage compressor rotating blades with dry ice as agent

Numerical investigations based on the Euler-Lagrange approach were carried out first to verify the efficiency of the on-wing cleaning of the compressor blades of aero engines by taking dry ice instead of aqueous solvents as agent. The coupling between particles and the gas phase as well as the interaction between particles and blades were considered by means of comprehensive simulations of the movement of dry ice in the blasting device and the rotating blade channel of the single-stage compressor. Then, the factors that influence dry ice cleaning efficiency were verified and analyzed through dry ice cleaning test on single-stage compressor rotating blades. Finally, the damage assessment of the blade surface and coating under low temperature and impact force was completed. According to the results, the erosion rate cloud map obtained by simulation calculations and the cleaning effect image obtained by the test both showed that the interaction between particles and blades was mainly in the area near the leading edge of the blade. The main variables that affected the cleaning efficiency were the blade rotating speed, the dry ice mass flow rate and the cleaning angle. Furthermore, the highest cleaning efficiency was acquired when the blade rotational speed was 2500 r/min, the dry ice mass flow rate was 6 kg/min and the cleaning angle was 90°. Under these conditions, the blade surface and the coating are not damaged. Dry ice cleaning is a feasible technology in terms of on-wing aero engines, which has broad prospects of applications.

Performance Assessment in a “Lane Departure” Scenario of Impending Collision for an ADAS Logic Based on Injury Risk Minimisation

The current prioritisation of road safety enhancement in the automotive sector is leading toward the near future implementation of Advanced Driver Assistance Systems (ADASs), aiming at the simultaneous intervention of braking and steering for impact avoidance in case of an impending collision. However, it is partially unclear how new technologies for controlling the steering will actually behave in the case of inevitable collision states; the need consequently emerges to propose and tune efficient ADAS strategies to handle the complexity of critical road scenarios. An adaptive intervention logic on braking and steering for highly automated vehicles is applied in the context of a “lane departure”, two-vehicle critical road scenario; the ADAS implementing the logic activates to minimise the injury risk for the ego vehicle’s occupants at each time step, adapting to the eventual scenario evolution consequent to actions by other road users. The performance of the adaptive logic is investigated by a software-in-the-loop approach, varying the mutual position of the involved vehicles at the beginning of the criticality and comparing the injury risk outcomes of the eventual impacts with those connected to the Autonomous Emergency Braking (AEB). The results highlight a twofold benefit from the adaptive logic application in terms of road safety: (1) it decreases the frequency of impacts compared to the AEB function; (2) in inevitable collision states, it decreases injury risk for the vehicles’ occupants down to 40% compared to the AEB. This latter condition is achieved thanks to the possibility of reaching highly eccentric impact conditions (low impact forces and occupants’ injury risk as a consequence). The obtained highlights expand the literature regarding the adaptive logic by considering a diverse critical road scenario and investigating how fine variations on the vehicles’ mutual position at the beginning of the criticality reflect on the injury outcomes for different types of intervention logic.

Crashworthiness and energy absorption of UHPFRC-steel composite sandwich structures under impact loading

This study aims to explore the dynamic crushing behaviors of a series of sandwich structures with varying configurations, which are composed of ultra-high performance fiber reinforced concrete (UHPFRC) face sheets and cores of steel and polyurethane (PU) foam. Drop-hammer impact tests were performed on 12 sandwich structure specimens, including four types (traditional frame (TF), ectopic frame (EF), corrugated plate (CP), and horizontal tube (HT)). The force profiles of EF type and HT type, compared with the other types, possessed low peak impact force (PIF) and high plateau force under the same impact energy. Test results indicated that the polyurea sprayed on the UHPFRC face did not affect the crashworthiness. Increases in core thickness can improve mean crushing force (MCF). The crashworthiness of the sandwich structure without the UHPFRC face sheet was weakened. The values of peak crushing force (PCF), MCF, energy absorption (EA), and specific energy absorption (SEA) under dynamic loading were greater than those in quasi-static loading. Finite element (FE) models were developed, validated, used to explore the energy absorption behavior in detail, and proved that EF-type and HT-type structures possess strong energy absorption stability. The multi-objective optimization showed that the HT-F structure is more suitable for practical applications.

Flow-type landslides Impacting V-shaped Diversions: Physical Modelling

In rural and sparsely populated areas, government issued pamphlets often recommend the construction of V-shaped diversions to protect personal property from flow-type landslides hazards, including debris flows. V-shaped diversions are advantageous because they attract low impact forces and runup heights due to their oblique impact angle. However, current design approaches are empirical, so it is unclear what resisting forces and wall heights are required. In this extended abstract, details of a new experimental setup and some preliminary results are presented. It is envisioned that findings from this study will help to shed light on scientific-based recommendations to design V-shaped diversions to enhance the resiliency of mountain communities globally.

Improving light-cured intermediate resin for hard and space mouthguard using a glass fiber.

A light-cured intermediate material is useful for fabricating a hard insert and a buffer space mouthguard (H&SMG). However, it requires improvement in its mechanical properties and shock-absorbing capacity. The aim of this study was to evaluate the mechanical properties of two prototype light-cured intermediate materials reinforced with glass fibers, and the impact absorption capacity and durability of H&SMGs made with the prototype intermediate materials. Two prototype materials containing long and microlength glass fibers in a light-cured intermediate material, Innerframe LC®, for H&SMG, were fabricated and tested. A three-point bending test was performed for evaluation of the mechanical properties. In addition, a shock absorption test was conducted using a customized pendulum impact testing machine to evaluate the H&SMGs' impact absorption capacity and durability. Long and microlength glass fibers significantly improved flexural modulus and strength. H&SMGs made with these two glass fiber-containing materials had high impact absorption capacity against both low and high impact forces, while the mouthguards made with long glass fiber materials had the best results. Long and microlength glass fibers with the prototype materials improved the mechanical properties of Innerframe LC® and the impact absorption capacity and durability of H&SMGs. H&SMGs made with the long glass fiber prototype materials had the best performance.

Trunk Kinematics of Experienced Riders and Novice Riders During Rising Trot on a Riding Simulator

Asymmetry of horses and humans is widely acknowledged, but the influence of one upon the other during horse riding is poorly understood. Riding simulators are popular for education of beginners and analysis of rider biomechanics. This study compares trunk kinematics and saddle forces of 10 experienced riders (ER) and 10 novice riders (NR) performing rising trot on a simulator. Markers were placed on the 4th lumbar (L4) and 7th cervical (C7) spinous processes, and both acromion processes. Displacements in three axes of motion were tracked using 10 high-speed video cameras sampling at 240 Hz. Displacement trajectories at L4 and C7 were similar between both groups, displaying an asymmetrical butterfly pattern in the frontal plane, which reversed when changing diagonal. Comparison between groups, NR displayed greater vertical displacement and higher saddle impact forces at L4 (P = .034), greater amplitude of medio-lateral displacement on the right diagonal between C7 and L4, and on the right diagonal while seated they rotated left (acromion processes) while the ER rotated right. Within group comparison demonstrated that on the right diagonal both groups produced significantly greater medio-lateral displacement at L4, and NR displayed significantly greater medio-lateral displacement between C7 and L4. On the left diagonal NR produced significantly greater vertical displacement and higher saddle impact forces.The findings of this study suggest that ER were more stable, symmetrical, and had lower impact force on the saddle. These issues could be addressed in beginners using a simulator to avoid unnecessary stresses on horses.

Crashworthiness investigation of draw bead in aluminum tubes under axial loading condition

This study aims to investigate the effects of the draw beads on the crashworthiness of the aluminum tubes under axial quasi-static loading. Based on this design philosophy, a total of 12 beading tube designs with various configurations were developed. Within each design, the effect of arrangement bead form on the crashworthiness performance was also analyzed. A finite element model, validated using experimental tests, was used to study the crashworthiness performance and progressive deformation of the tubes. Based on the results, a multi-criteria decision-making method known as Technique of Order Preference by Similarity to Ideal Solution was employed to determine the most suitable tube that features high energy absorption and low impact force. The best tube with a high score was selected to investigate the effect of bead formed direction on aluminum tubes. Consequently, the study identified a bead shape tubes configuration that exhibits superior crashworthiness and low impact force. The beading tube design methodology presented in this study allows the exploitation of variable shapes geometries for the development of high-efficiency energy-absorbing structures and their crushing behaviors.

Impact Abrasive Wear Resistance of CrN and CrAlN Coatings

The impact wear resistance of the hard coating is very important in the high-temperature environment of the nuclear power plant. CrN and CrAlN coatings were prepared using multi-arc ion plating. The impact abrasive wear resistance of the coatings was investigated at varied temperatures through a controlled kinetic energy impact wear rig, and their impact mechanism was elucidated. No extensive spalling was found on the surface of the CrN and CrAlN coatings after 104 impacts under the no-sand condition. The excellent antioxidant properties of the CrN and CrAlN coatings can protect the substrate from oxidation under the no-sand condition at 500 °C. The impact mechanism of the two coatings was plastic deformation under the no-sand condition, and it was mainly material removal under the sand condition. The depth and width of wear scar were larger under the sand condition than under the no-sand condition. The impact wear region was divided into a mixed impact zone and a sand impact zone. Compared with the CrN coating, the CrAlN coating had lower impact force and shallower impact wear scar, proving that it has better anti-impact wear properties.

Lower impact forces but greater burden for the musculoskeletal system in running shoes with greater cushioning stiffness

ABSTRACT In a recent randomised trial investigating running shoe cushioning, injury risk was greater in recreational runners who trained in the shoe version with greater cushioning stiffness (Stiff) compared to those using the Soft version. However, vertical impact peak force (VIPF) was lower in the Stiff version. To investigate further the mechanisms involved in the protective effect of greater cushioning, the present study used an intra-subject design and analysed the differences in running kinematics and kinetics between the Stiff and Soft shoe versions on a subsample of 41 runners from the previous trial. Data were recorded in the two shoe conditions using an instrumented treadmill at 10 km.h−1. VIPF was confirmed to be lower in the Stiff version compared to the Soft version (1.39 ± 0.25 vs. 1.50 ± 0.25 BW, respectively; p = 0.009, d = 0.42), but not difference was observed in vertical loading rate (p = 0.255 and 0.897 for vertical average and instantaneous loading rate, respectively). Ankle eversion maximal velocity was not different (p = 0.099), but the Stiff version induced greater ankle negative work (−0.55 ± 0.09 vs. −0.52 ± 0.10 J.kg−1; p = 0.009, d = 0.32), maximal ankle negative power (−7.21 ± 1.90 vs. −6.96 ± 1.92 W.kg−1; p = 0.037, d = 0.13) and maximal hip extension moment (1.25 ± 0.32 vs.1.18 ± 0.30 N.m.kg−1; p = 0.009, d = 0.22). Our results suggest that the Stiff shoe version is related to increased mechanical burden for the musculoskeletal system, especially around the ankle joint. Trial registration: ClinicalTrials.gov identifier: NCT03115437.

Force attenuation capacity of weft-knitted spacer fabric in low-velocity impact

PurposeThis study aimed to determine the peak impact force and force attenuation capacity of weft-knitted spacer fabrics intended for padding that can be used for human body protection against impact.Design/methodology/approachA total of five weft-knitted spacer fabrics were fabricated with four different diameters of nylon monofilament yarns and one doubled monofilament yarns, respectively. The impact performances of the weft-knitted spacer fabrics were tested using a drop test method with a customized test rig to simulate falling. Impact tests were conducted on single- and multilayered experimental spacer fabrics to investigate the peak impact force and force attenuation capacity.FindingsIt was found that weft-knitted spacer fabric with a coarser or larger diameter of monofilament spacer yarn generated lower impact force and higher force attenuation capacity, thus resulting in better impact performance. Greater force attenuation can be achieved by utilizing a higher number of spacer fabric layers. However, the increase in thickness must be considered with the spacer fabric end use.Originality/valueThis study employed relatively coarse nylon monofilament yarn as spacer yarns to gain knowledge on the impact performance of weft-knitted spacer fabrics compared to warp-knitted spacer fabrics which are more common. The results showed that the diameter of spacer yarn significantly influenced the impact performance of the experimental weft-knitted spacer fabrics. These results could be useful for designing and engineering textile-based impact protectors.

Update on Minimalist Running Shoes.

This article provides updated information comparing minimalist running shoes (MRS) to conventional running shoes (CRS). Our previous review found that, compared with running in CRS, transitioning to MRS resulted in lower energy cost and less ground contact occurring at the forefoot, resulting in lower impact forces. There was some increased risk of injury with MRS, although data were conflicting. A more recent 26-week study involved 30 trained runners using CRS and 31 using MRS. The proportion of training time in the assigned shoes increased by 5% each week. After the first 6 weeks of transition (35% of training time in the assigned shoe), energy cost was lower and 5-km running time faster in MRS compared with CRS. No further improvement occurred from weeks 6 to 26. There were no significant differences in injury incidence in the two groups (CRS = 37%, MRS = 52%; p = .24). Running-related pain was higher in the MRS group in the knee, shin, calf, and ankle and increased at these locations as running mileage increased. Risk of injury in MRS increased as participant body weight increased. These more recent data suggest that MRS can improve performance, but most runners should limit running in MRS to 35% of training time and in situations where optimal performance is desired (e.g., races, fitness tests).

Fatigue behaviour of Plasma Sprayed Titania and Chromia Coatings

Cr2O3 and TiO2 powders were deposited by atmospheric plasma spray (APS) on steel substrates. Microstructural analysis of the coatings showed typical lamellar structure with good coating quality. Fatigue strength was studied by using cyclic testing (measuring with an inhouse-built apparatus the strength of the coated systems under a wide range of impact cycles) and static loading tests (Vickers tests standards with 600N and 1500N) measuring the adhesion properties of the coatings. In low cycles (1x103) Titania coatings exhibited better strength, while at intermediate (4.5x105) and high (1x106) number of impact cycles, both Chromia and Titania coatings exhibited quite similar strength characteristics. At low impact force the thickness of the coatings plays critical role with better performance obtained by Chromia coatings. During static loading both coatings exhibited similar characteristics at the crater diameter but with larger crater depth for Titania. Chromia coatings exhibited higher strength resistance than Titania coatings with better mechanical properties and coating structure.