Dynamic Damage Research Articles

The Research on the Dynamic Damage Constitutive Model Parameters of the Novel TiZrNbVAl Refractory High-Entropy Alloy under Impact Conditions

The Research on the Dynamic Damage Constitutive Model Parameters of the Novel TiZrNbVAl Refractory High-Entropy Alloy under Impact Conditions

Investigation on Dynamic deformation and Damage of Steel Ribbon Wound Vessel for Hydrogen Storage Under Fragment Impact Loading

Investigation on Dynamic deformation and Damage of Steel Ribbon Wound Vessel for Hydrogen Storage Under Fragment Impact Loading

Dynamic Response Mechanisms and Damage Analysis of Slopes Via Wave Theory and Rainfall Shaking Table Tests

Dynamic Response Mechanisms and Damage Analysis of Slopes Via Wave Theory and Rainfall Shaking Table Tests

Dynamic Compressive Damage Constitutive Correction of Concrete Under Freeze-Thaw Cycle

In order to investigate the uniaxial dynamic compression constitutive model for concrete under freeze-thaw conditions, a finite element analysis was employed to model the temperature field of the concrete. The resulting data were subsequently integrated into the thermal stress field as a predefined parameter for a sequentially coupled thermal stress analysis. Following this, a numerical simulation was performed to assess concrete damage progression during a dynamic compression test in a freeze-thaw setting. The constitutive model was developed by adjusting the parameters that govern the development of concrete damage within the uniaxial stress-strain relationship, as specified in the Code for Design of Concrete Structures. The uniaxial compression behavior of concrete subjected to freeze-thaw was simulated utilizing both the modified intrinsic model and the damage plasticity model available in the software while accounting for the effects of the damage factor. The findings indicate that the modified constitutive model aligns closely with the actual experimental results. These research outcomes have potential applications in numerical simulations and various engineering practices related to concrete.

Modeling and validation of dual-impact behavior of fault in cylindrical bearing raceway considering defect evolution

Abstract Characterization of the dual-impact phenomenon is an effective way to evaluate the extent of damage in a cylindrical bearing, and thus the bearing’s remaining life. Therefore, it is of great importance to conduct in-depth research and achieve through understanding on the impact behaviors during the defect development process throughout the life cycle of the bearing. In this paper, a nonlinear dynamic model considering defect evolution is established for cylindrical bearings. The model integrates non-penetrating and penetrating damage models to simulate the continuous evolution of inner and outer raceway damages, overcoming the limitations of traditional single-damage modes. Its automatic switching mechanism ensures uninterrupted simulation across multiple damage modes, enabling dynamic damage propagation analysis. The size and severity of raceway defects during the bearing’s life cycle can be accurately inferred by analyzing the timing of vibration responses with defect estimation methods. This enables precise assessment of the bearing’s health status. To validate this, fault bearings with varying damage types and sizes were manufactured and tested. The vibration signal analysis results have shown a good simulation-experiment agreement. The developed model provides a good candidate for digital twin modeling for the roller bearing condition monitoring.

Dynamic impact mechanical damage analysis and tomato robotic post-picking crating optimization based on multiscale finite element model

Dynamic impact mechanical damage analysis and tomato robotic post-picking crating optimization based on multiscale finite element model

Dynamic response and damage assessment of AAC masonry walls reinforced by spraying polyurea under blast load

Dynamic response and damage assessment of AAC masonry walls reinforced by spraying polyurea under blast load

Study of dynamic characteristics and damage mechanism of pile–net composite roadbeds in high-speed railways under seismic action

Study of dynamic characteristics and damage mechanism of pile–net composite roadbeds in high-speed railways under seismic action

Dynamic response and damage constitutive model of freeze-thawed sandstone with or without filling materials in prefabricated flaws

Dynamic response and damage constitutive model of freeze-thawed sandstone with or without filling materials in prefabricated flaws

Dynamic direct tensile mechanical response characteristics and damage fracture mechanism of water-saturated frozen sandstone

Dynamic direct tensile mechanical response characteristics and damage fracture mechanism of water-saturated frozen sandstone

A Microplane Model That Considers Dynamic Fatigue Damage and Its Applications in Concrete Infrastructure

A Microplane Model That Considers Dynamic Fatigue Damage and Its Applications in Concrete Infrastructure

Evaluating the dynamic response and damage resistance of a cable-stayed prestressed concrete bridge under above-deck blast

This paper details the outcomes of a dynamic analysis and performance evaluation conducted on an existing cable-stayed prestressed concrete bridge subjected to the above-deck blast loading. Utilising the load blast enhanced method, a comprehensive finite-element model was developed to assess both the global and local responses of the bridge structure, determine component damage, and evaluate the bridge’s resilience against the above-deck blast scenarios. The analysis of damage and performance evaluation of the bridge’s girder and pylons across four different scenarios, including symmetric and asymmetric blast loading above deck of midspan of both main span and south side span, indicates that a well-designed and constructed bridge predominantly maintains elastic behavior, with localised deck damage not posing a significant risk to progressive collapse. Furthermore, the investigation into the bridge pylon’s blast resistance determines a safe scaled standoff distance for a typical reinforced concrete tower. Notably, in the case where the explosive is detonated near the cable anchorage region, significant anchorage damage is observed, highlighting a considerable risk of cable failure. It underscores the importance of thoroughly assessing anchorage behavior during a blast event and integrating blast-resistant design principles.

Seismic Vulnerability Evaluation of Metro Station Complex Structures in TOD Mode Based on IDA Method

In order to further study the dynamic response and damage status of the subway station structure and promote the development of the TOD (transit-oriented development) mode structure system, this paper proposes a calibration method for the seismic performance index limit of the subway station complex structure in TOD mode. Taking a practical project in the Beijing city sub-center station integrated transport hub as the research background, the nonlinear analysis model of soil–structure interaction under different site types is established. Firstly, the limit value of the interstory drift ratio is determined by the pushover loading method of the inverted triangular distributed load for the three-dimensional numerical model. Secondly, different types of seismic waves are selected to analyze the seismic vulnerability of the simplified two-dimensional numerical model, and the exceedance probability of different damage states of the structure is quantitatively analyzed. By analyzing the pushover curve, the maximum interstory drift ratio limits corresponding to the five damage states of the subway station complex structure are 0.14%, 0.32%, 0.66%, and 1.12%, respectively. Under different site types and different types of seismic waves, the seismic response law of subway station structures in TOD mode is different. Using different types of ground motion as the input, the mean and discreteness of different IDA curve clusters are quite different. The near-field pulse-type ground motion has a greater impact on the ground motion of the structural system under the Class II site, and the far-field long-period ground motion has a greater impact on the structure under the Class III site. Damage decreases with the increase in the equivalent shear wave velocity of the site, that is, the harder the site’s soil is, the less susceptible the structural system is to damage by underground motion. The established seismic vulnerability curve and seismic damage probability table can effectively evaluate the seismic performance of subway station complex structure in TOD mode. The research results can provide a valuable reference for the seismic performance evaluation of similar underground structures.

Dynamic response and damage collapse of bridge subjected to debris flow impacts using coupled Eulerian Lagrangian method

The coupled Eulerian Lagrangian (CEL) fluid–structure interaction method was employed to study the bridge’s dynamic behaviour under debris flow. The accuracy of the numerical simulations using the CEL method was confirmed by comparing them with small-scale experimental results for debris flow impacting bridge piers. For a real continuous girder bridge susceptible to debris-flow disasters, a detailed finite-element model of the bridge was established, with an emphasis on the precise modelling of hollow thin-walled variable-section piers. Utilising the CEL method, the study explored the effects of debris flow with varying burst frequencies on the bridge. The process of debris flow impacting bridge pier can be summarized into four stages: ‘contact’, ‘flow around’, ‘closure’, and ‘stabilisation’. Prior to reaching the stabilisation stage, the stress near the flow-passing surface at the bottom of the pier gradually increases. The erosion effect of debris flow on the pier was further taken into consideration, distinguishing it from the simplified method of direct impact, as recommended in the standard. The CEL method provides a more precise representation of local damage and structural response in bridges under debris flow impact compared to the simplified method. During the impact under once-in-100-year debris-flow, the lower part of the pier experienced concrete damage and exposed steel bars, yet still maintained normal functionality. The study not only elucidated the effects of debris flow on the flow field distribution, stress, impact, displacement, and overall damage to the bridge but also highlighted vulnerable points within the bridge. The bridge appeared to meet operational requirements for a design lifespan of 100 years, but it may potentially collapse during once-in-200-year debris-flow. Under the once-in-200-year working condition, the weak point at the bottom of the pier, that is, the hollow solid conversion place, is first damaged, and further expands under the impact and erosion of the debris flow, resulting in the complete failure of the foundation support of the pier and the collapse of the bridge.

Quantifying Real-Time Dynamic Responses and Damage Mechanics of Human Tympanic Membranes Exposed to Blast Waves

Quantifying Real-Time Dynamic Responses and Damage Mechanics of Human Tympanic Membranes Exposed to Blast Waves

Dynamic Damage Distribution in Inclined Shafts under High Geostress During Blasting Excavation

Dynamic Damage Distribution in Inclined Shafts under High Geostress During Blasting Excavation

Dynamic response and damage mechanism of reinforced concrete beam bridges under rockfall impacts

In the first phase, this study references previous beam impact tests and uses Abaqus to create a finite element model for beams. Then the feasibility and accuracy of the concrete plastic damage model in analyzing the response of reinforced concrete structures under impact loads were validated. In the second phase, a detailed numerical model was developed using Abaqus to examine the dynamic response and damage mechanism of prestressed concrete simply supported box girder bridge with a 30 m span and high piers. The analysis considered a single rockfall impacting the pier at various heights and multiple rockfalls of varying radius and velocities hitting the bridge successively. Results showed that under a single rockfall, both the peak bending moment and shear force occurred at the point of impact. The shear force at the upper section of the impacted pier was significantly higher than at the lower section. For multiple rockfalls, the maximum bending moment occurred at the first impact location, followed by the second, with nearly identical shear force peaks for both. When comparing single and multiple rockfall impacts, the first impact influenced the second’s peak period, but the second did not affect the first. Bridge damage analysis revealed severe compressive damage at the impact site in both scenarios, with concrete failure and exposed reinforcement observed on the inner side of the impact points. Tensile damage was more pronounced under multiple rockfall impacts. Parametric analysis showed that while impact height had little effect on the peak impact force, the peak bending moment and shear force varied significantly with height. The peak impact force, horizontal displacement, bending moment, and shear force increased with rockfall velocity and radius in multiple impacts. The analysis results indicate that the dynamic response and the damage of beam bridges under rockfall impacts are highly related to the connection joints, which must be given special attention during bridges design. Damage assessment methods indicated minor damage when the pier was impacted by rockfalls with a 0.5 m radius, but severe damage occurred at a velocity of 40 m/s, with moderate damage in other cases. Finally, some analysis results can provide important references for the bridges of the same type. Meanwhile, this study can also provide a useful reference in design and restoration of reinforced concrete beam bridges located in areas prone to frequent geological disasters.

Dynamic response and fatigue damage analysis of offshore wind turbines supported by four-pile jacket in clays under typhoons

Dynamic response and fatigue damage analysis of offshore wind turbines supported by four-pile jacket in clays under typhoons

Finite Element Modeling of Dynamic Response of RPC Columns and Frames Under Coupled Fire and Explosion

Reactive powder concrete (RPC) is widely used in ultra-high-rise buildings, hydropower stations, bridges, and other important infrastructures. To study the dynamic response and damage characteristics of RPC columns and frames considering coupled fire and explosions, an analytical model of RPC columns and frames with coupled fire and explosions was established by using ABAQUS (2021) finite element software. The dynamic response and damage degree of RPC columns under coupled fire and explosions were investigated to reveal the influence laws of parameters such as cross-section size, axial compression ratio, reinforcement rate, and fire duration on the dynamic response of RPC columns at high temperatures. The dynamic response of the frame structure was analyzed when the explosion load was applied to the bottom corner columns, side columns, and top beams, respectively. The results show that the fire severely weakened the blast resistance of RPC columns; the maximum mid-span deformation and residual deformation of RPC columns decreased with the increase in cross-section size and longitudinal bar reinforcement ratio and increased with the increase in fire duration and axial compression ratio. When the explosion load was applied to the corner columns of the bottom floor of the frame, the bottom corner columns were almost completely destroyed, and there was a significant risk of the structure collapsing. Based on the results of the data analysis, a method to enhance the explosion resistance of RC frame structures using RPC materials at high temperatures is proposed.

Response and Damage Characteristics of Roadway Wall Under Impact Load Action of Methane Explosion

In order to solve the wall damage problem of roadways with deep and high stress in methane explosion accidents, mathematical-physical analysis models for the dynamic response damage of roadway walls were established by LS-Dyna software in this paper, and the models were validated to be effective. The roadway wall displacement, stress, and deformation characteristics under the methane explosion impact load were numerical simulated and the response and damage evolution process of the roadway wall was studied. The results indicate that the model established in this study can reflect the dynamic response damage characteristics of the roadway wall. The damage of the roadway wall caused by the methane explosion impact load was mainly concentrated in the methane accumulation section, but the maximum principal stress of the roadway wall near the methane accumulation section was still high, and the damage possibility was also high. The dynamic response damage of the roadway wall decreased with the increase in the distance from the initiation explosion point. The stress response of the curved part of the roadway roof was the most severe, and the stress response of the side part was second to that of the roof. The stress changes at the corners were significant, but the deformation was small. The bottom plate was minimally affected by the methane explosion impact loads. The arch top and two sides of the roadway were first subjected to significant impact, resulting in a high-pressure zone. The peak pressure of the side part was relatively high, and the difference in peak pressure between the corner and the bottom plate was not significant.