Stress And Strain Research Articles

Study and application on the size effect and end effect of red sandstone mechanical properties

Based on the size effect, end effect, and burst tendency of rocks, this paper designs and conducts a series of uniaxial compression laboratory experiments and numerical simulation experiments to explore the influence of these factors on the mechanical properties of rocks. Dense, hard, and brittle red sandstone was used in the experiments, and specimens with different heights, cross-sectional areas, and cubic volumes were prepared. By measuring stress–strain curves, uniaxial compressive strength, and other physical and mechanical parameters, the effects of size effect on rock strength and failure modes were analyzed. Additionally, the paper discusses the influence of different-sized specimens on the rock burst tendency, introducing a parameter K to evaluate this tendency. The results indicate that the rock burst tendency of different-sized specimens remains stable around 2, with the K value of H150 specimens potentially being higher due to structural instability. Furthermore, numerical simulations using RFPA3D software were conducted to further validate the experimental results and delve into the mechanism of the end effect on the mechanical properties of rock specimens. The results indicate that the compressive strength of specimens increases with their size, and specimens of different sizes exhibit notable differences in failure modes. This paper also designs a novel "enhance strength and reduce rockburst" negative Poisson’s ratio material pad based on the "cyclo-hoop effect" induced by the end effect, aiming to improve the strength of compressed components and reduce the intensity of energy release during failure. This study provides essential insights into understanding rock mechanical properties and their applications in engineering.

Analysis of Deformation Mechanism Behaviors of Ti-5Mo-1Fe Alloy under Quasi-static and Dynamic Deformation

To evaluate the deformation mechanisms of Ti-5Mo-1Fe alloy, compression tests were performed at strain rates ranging from 10<sup>-3</sup>/sec to 3×10<sup>3</sup>/sec at room temperature. The results showed that Ti-5Mo-1Fe alloy exhibited different deformation mechanisms depending on the strain rate. Under quasi-static strain rates, the Stress-Induced Martensitic (SIM) transformation from the metastable β phase (BCC) to the α" phase was observed through the double yield phenomenon in the stress-strain curve. This contributed to enhanced compressive strength, work hardening, and ductility by absorbing and dispersing deformation energy. Shear bands (SB) were observed near the fracture zone under quasi-static conditions, since the SIM transformation acts as an obstacle to dislocation movement. In contrast, a dynamic strain rate generated adiabatic shear bands (ASB) due to localized heating, leading to coarsened grains near the fracture zone. With increasing strain rates, significant temperature rises were detected in the specimens, leading to increased β phase stability and a reduced chemical driving force for the α" transformation, thereby suppressing the SIM transformation. Consequently, dislocation slip became the dominant deformation mechanism at high strain rates. This study provides insights into the strain rate sensitivity of metastable β-titanium alloys, offering fundamental information for the development of advanced Ti alloys with high strength, good ductility, and impact resistance.

Machine learning insights into the strain-stress behavior of nitinol alloys at low temperatures: Utilizing the orange data mining tool

This study entails a new technique, based on machine learning algorithms, for predicting the strain-stress behavior of Nitinol alloys. The study utilizes Orange data mining software to determine if algorithms like Linear Regression, Random Forest, k-nearest neighbors, and decision tree are related to the effectiveness. The nitinol-based alloy, which has both shape memory and superelasticity, is used in a wide range of biomedical devices, aerospace constructions, and automated apparatus. Temperature variation is a main factor affecting the Nitinol behavior. It is therefore required to carry out an in-depth analysis of strain-stress patterns. Employing machine learning algorithms along with data mining tools allows the exact prediction of the Nitinol alloy performance under any given condition. The research is purposed to establish the relationship between temperature and mechanical strength of Nitinol by analyzing strain-stress curves that were obtained from tensile tests carried out at different temperatures. Looking at overall results, kNN has the highest accuracy of the models upon comparing MSE and RMSE, and has higher R² and, therefore stands as the model of high reliability. Results show that machine learning algorithms successfully forecast the mechanical responses of Nitinol under temperature variations, which assists in determining their formability properties and hence, advancing Nitinol applications in various fields. This research demonstrates machine learning uses in developing materials science and engineering knowledge by showing the ability to predict Nitinol alloy behavior, which includes strain-stress characteristics at low temperatures. Furthermore, the research's significance lies in addressing ethical considerations and practical issues, such as the necessity of implementing an organized approach to achieve environmental benefits.

Interfacial cohesive zone model based on atomic potential energy for CFRP

Carbon-fiber-reinforced polymer (CFRP) composites are utilized extensively in aero-engine casings, due to the superior specific mechanical properties and well-developed manufacturing techniques. The interface plays a key role in the macromechanical properties of CFRP. In this paper, an interfacial cohesive zone model (ICZM) of CFRP based on atomic potential energy is proposed, which can accurately characterize the interfacial mechanical behavior of CFRP. Then ICZM is applied to the unit cell model to predict the transverse mechanical behavior and damage evolution of CFRP, and verified by experimental results. The simulation results of the transverse modulus, strength, and ultimate strain for ICZM are 9.62 GPa, 66.87 MPa, and 0.78, respectively. The simulation errors of the transverse modulus, strength, and ultimate strain are all less than 3%, and the simulated damage evolution aligns with the experimental result, validating the precision of ICZM. The research shows that: for the infinite carbon atom layer and epoxy, the shear cohesive stress is zero; for the finite carbon atom layer and epoxy, the shear cohesive stress is much smaller than the tensile cohesive stress; the carbon fiber radius has little effect on cohesive energy; the simulated stress–strain curve for ICZM aligns with experiments, which means that ICZM can reflect the nonlinearity of CFRP. The research result can provide a calculating tool for the structural design of the aero-engine casing.

Ab-initio trained machine learning potential for MAX compound Ti2AlC: construction, validation, and study of non linear elasticity

Abstract One of the intriguing features exhibited by the layered MAX phase compounds, is the nonlinear elastic behaviour. Since the experimental observation of this curious behaviour, the underlying micro-mechanism has been discussed to interpret experimental observations. However, the theoretical investigation remained a challenge due to the associated length and time scales of the phenomena. In the present work, we adopt a data driven approach to develop a machine learned interatomic potential for the MAX compound Ti2AlC following the moment tensor potential protocol. The constructed potential is validated in lattice constant, formation energy, elastic constant, and stacking fault energies. Finally, applying machine learned potential in classical molecular dynamics provides a faithful representation of the experimentally observed nonlinear elasticity for Ti2AlC. The generated atomic configurations confirm the proposal of formation of ripplocations which allow atomic layers to glide relative to each other without breaking the in-plane bonds. We find common defects, like Al vacancy, strongly influence the hysteresis properties of the stress–strain curve, paving the route to defect-engineered nonlinear elasticity.

An Integrated 3D DEM Modeling Process for Bimrocks Considering Post‐Peak Behavior and Block Breakage

ABSTRACTBimrocks, a complex rock mass commonly found in geotechnical engineering, are often analyzed through the discrete element method (DEM) to understand their mechanical behavior from both macro and micro perspectives. However, there is limited research addressing the post‐peak behavior of bimrocks, particularly in terms of the uniaxial compression stress–strain curve and failure characteristics, with many studies overlooking the complex nature of their post‐peak behavior. This study proposes a comprehensive method for constructing three‐dimensional (3D) numerical samples of bimrocks and selecting appropriate parameters, focusing on accurately capturing both the post‐peak curve shape and failure characteristics. By combining laboratory tests with CT scanning techniques, numerical samples with structures matching those of the physical samples are created, addressing the issue of block stone breakage in traditional discrete element simulations. The study introduces the selection criteria for matrix and block stone parameters and analyzes the microscopic factors influencing the post‐peak curve and failure characteristics. Results indicate that the damping coefficient and loading rate are crucial in shaping the post‐peak curve, with complex curves requiring multiple damping coefficients. Additionally, the radius multiplier influences crack propagation direction, while the strength ratio affects crack penetration and secondary cracking, with these factors being dependent on the matrix strength.

Impact of Water Saturation on the Anisotropic Elastic Moduli of a Gas Shale

Abstract How water saturation affects elastic properties is particularly important for analyses of gas shales in unconventional reservoirs, but experimental data in defined partially saturated conditions are rare. We show that the elastic moduli of a gas shale vary significantly with water saturation whereas the static anisotropy does not. A series of repeated hydrostatic compression were carried out on a gas shale specimen at various water saturation states to determine the elastic moduli ( $${E}_{\text{v}}$$ E v and $${E}_{\text{h}}$$ E h ) as a function of degree of saturation ( $${S}_{\text{r}}$$ S r ). The elastic moduli were calculated from the reversible stress–strain curves after repeating confining pressure cycles. We found that, while water saturation increases, the elastic moduli peak at intermediate degree of saturation and then decreases to the minimum value at quasi-saturation. This evolution of the elastic moduli with degree of saturation may be explained by unifying two water retention mechanisms, adsorption and capillarity, that have overall competing effects on the stiffness. It is believed that adsorption softens the gas shale by reducing the friction of the load-bearing clay matrix, while capillary menisci stiffen the gas shale by providing stabilizing forces. The Young’s modulus anisotropy ( $${E}_{\text{h}}/{E}_{\text{v}}$$ E h / E v ) did not show appreciable change with degree of saturation. Confining pressure seems to be a more important control on changes in the static anisotropy. Analyzing the volumetric behavior of gas shales in unconventional reservoirs should take into account the degree of saturation dependency. Extrapolating the experimental results to in-situ conditions must be done with great care.

Abstract TP366: Impact of Neutrophil Extracellular Traps on Stroke Clot Mechanics, Radiomics, and Histology

Introduction: In stroke clots, neutrophil extracellular traps (NETs) promote thrombosis, enhance clot stability, and decrease clot amenability to thrombectomy and thrombolysis. Objective: We examine the relationship between NET enrichment and clot mechanical characteristics, radiomics, and histological microstructure. Methods: White blood cells (WBCs) were concentrated from human donor whole blood. Platelet-rich plasma and red blood cells (RBCs) were isolated by centrifugation and mixed with WBCs to produce 0%, 20%, and 40% RBC clot analogs. Lipopolysaccharide (LPS) was added (0μL, 2μL, 6μL into 1mL dH2O) to enrich clots with varying NET amounts. CaCl2 induced clotting. Clots were incubated while rotating at 37°C. Clot analogs were assessed mechanically by uniaxial stretch tester and stress-strain curves, radiomically through high-resolution microCT and radiomic feature analysis, and histologically through whole-slide imaging of H&E-stained tissue and immunofluorescence (Citrullinated Histone Antibody and DAPI counterstain) to quantify NETs. Statistical analysis assessed what mechanical, radiomic, and histological features were significantly different among clots of various NET enrichment. unsupervised clustering was performed on radiomic and histological features to identify signatures unique to NET-enriched clots. Results: LPS addition produced clots with increasing NET enrichment and microstructural complexity. For fibrin-platelet rich clots (0% RBC), NET enrichment produced significant increase in mechanical stiffness, measured by breaking strength (max load) and Young’s Modulus. For each percent composition, radiomic and histomic profiling clustered clot analogs well by NET-enrichment, with NET-enriched clots demonstrating distinct radiomic and histological feature trends. See Figure 1. Conclusion: NET enrichment produces mechanically stiffer clot analogs with distinct microstructure, radiomic, and histological profiles.

Flow stress-strain curves and dynamic recrystallization behavior of high carbon low alloy steels during hot deformation

Flow stress-strain curves and dynamic recrystallization behavior of high carbon low alloy steels during hot deformation

Assessment of dwell-fatigue properties of nickel-based superalloy coated with a multi-layered thermal and environmental barrier coating

A three-layered experimental thermal and environmental barrier coating (TEBC) was deposited using air plasma spraying technology on cylindrical specimens of nickel-based superalloy MAR-M247. TEBC consists of mullite (Al6Si2O13) and hexacelsian (BaAl2Si2O8) upper layer, Y2O3 stabilised ZrO2 interlayer and CoNiCrAlY bond coat deposited on the grit-blasted surface of MAR-M247. The cyclic plastic response and damage mechanisms in uncoated and TEBC-coated MAR-M247 have been studied in isothermal dwell-fatigue tests conducted under strain control with constant strain amplitude at 900 °C. In each cycle, 5-minute dwells were introduced in both tensile and compression peaks of the hysteresis loop. Fatigue hardening/softening curves, stress relaxation curves, cyclic stress-strain curves and fatigue life curves are reported. Ceaseless mild softening has been found in both uncoated and TEBC-coated MAR-M247. TEBC-coated MAR-M247 showed an improved lifetime in the whole range of tested strain amplitudes. Data obtained from stress relaxation curves were used to assess the fraction of creep damage. The generalised damage accumulation rule was used to evaluate damage due to fatigue-creep-environment interaction. A study of the surface relief and internal microstructure using SEM and TEM helped to interpret the specifics of fatigue behaviour of uncoated and TEBC-coated material. The effectiveness of this newly developed TEBC, together with the dwell sensitivity of MAR-M247, were discussed from the perspective relevant to dwell-fatigue cyclic straining.

Extracting mechanical properties and uniaxial stress-strain relation of materials from dual conical indentation by machine learning

Extracting mechanical properties and uniaxial stress-strain relation of materials from dual conical indentation by machine learning

Research on the multiscale mechanical properties of paleosols based on the freeze‒thaw cycle

ABSTRACT To study the failure mechanism of paleosol landslides, taking the paleosol of a landslide body in Yan'an as an example, scanning electron microscopy (SEM), nuclear magnetic resonance (NMR), and conventional triaxial tests were used to obtain particle composition, microstructure scanning results, T2 spectral distribution, and stress-strain curves under different freeze-thaw cycles. The results showed that with the increase of freeze-thaw cycles, the number of micropores in paleosol increased to 70.5% and stabilized, while the number of micropores decreased to 18.4%, mesopores decreased to 7.5%, macropores decreased to 3.6%, and eventually stabilized. The fractal dimension of pore shape distribution in paleosol increases along a convex curve to 1.42. The T2 spectrum presents three stepped small peaks, with the peak spectral area of relaxation time ranging from 0.01 ms to 3.16 ms being the largest, indicating that small pores dominate. As the number of freeze-thaw cycles increases, the peak area of smaller relaxation times expands, indicating that freeze-thaw cycles have destroyed the structure of paleosols and generated a large number of tiny pores. Under conditions of higher confining pressure and lower moisture content, when there are fewer freeze-thaw cycles, the strain corresponds to higher stress. The freeze-thaw cycle makes the stress-strain curve of paleosol harder, indicating that the original structure is damaged and the new structure appears as disordered particles.

Application of mean maximum Young's modulus value as a new parameter for differential diagnosis of prostate diseases.

Transrectal shear wave elastography (T-SWE) can be used non-invasively to diagnose prostate cancer (PCa) and benign prostatic hyperplasia (BPH). The prostate tissue can be viewed as an ellipsoidal sphere with viscoelastic characterization. Linear elastic model has been used to characterize soft tissues, and the simplification of partial characterization provides incomplete information. This retrospective study included 144 suspected prostate disease patients who had completed T-SWE from our hospital. The mean maximum Young's modulus value (m-Emax) of the maximum transverse section of prostate was obtained by calculating the mean of 12 measured maximum Young's modulus value (Emax) in the four quadrants. M-Emax was statistically correlated with and good discriminability for PCa and BPH. There was a nonlinear dose-response relationship between m-Emax and PCa risk, as well as between m-Emax and BPH risk. The relationship between m-Emax and prostate disease was consistent with the nonlinear effect showed by tissues as an elastic model in normal physiological activity areas. When stiffness increasing, the stress-strain relationship was approximates linear. M-Emax can be used as an innovative parameter of Young's modulus value, which represents the stiffness of prostate tissue in T-SWE, and has a good effect in the differential diagnosis of prostate diseases.

Development of Local Ductile Failure Assessment Method and Its Application to Four Alloys—Part I: Stress–Strain Relation and Analysis Without the Effect of Lode Angle

Abstract In evaluating the margin against fracture under various loadings, resistance against initiation and propagation of fracture needs to be evaluated. Elastic-plastic finite element (FE) analysis serves as a powerful tool for such assessment but prediction of plastic deformation and stress state in structures needs stress–strain relations to be implemented in the analysis. For avoiding the necessity of testing and processing the data each time, true stress–strain relations whose constants can be determined from fundamental properties such as yield or proof stress, tensile strength, rupture elongation, and reduction of area were developed based on the results of uniaxial tensile tests on many kinds of alloys used in nuclear power plants. Tensile tests were also conducted on notched round bar and grooved plate specimens made from four representative materials at various temperatures below the creep regime. Conventional large strain elastic-plastic analyses were performed on these specimens to elucidate the necessity of incorporation of the effect of damage on deformation in addition to a failure criterion. Then the calculation of damage based on equivalent plastic strain rate and stress triaxiality factor was introduced with an aim of predicting failure and the gradual decrease in deformation resistance. It was found that, although the predictions became more realistic, the behavior of some of the specimens could not be predicted with a sufficient accuracy when the effects of the stress triaxiality factor were calibrated based on the analyses of other types of specimens, suggesting the necessity of introducing another parameter which will be addressed in a subsequent paper.

Mechanical properties and piecewise constitutive model of fine sandstone in mining area of western China

Owing to the differences in sedimentary environments in the mining areas of western China, the mechanical properties of rocks in this region are significantly different from those in the central and eastern regions. Therefore, uniaxial cyclic loading-unloading tests were conducted on fine sandstone found in many roof rocks to study the evolution laws of mechanical properties, deformation characteristics, acoustic emission (AE) parameters, and energy under cyclic loading and unloading conditions. The accumulated residual strain, dissipative energy, acoustic emission cumulative ringing counts, and cumulative energy were introduced to characterize the degree of rock damage. Based on this, a piecewise constitutive model was established for fine sandstone. The results indicate that (1) the cumulative ringing counts and cumulative energy of the AE increase in a stepwise manner with an increase in the cyclic loading and unloading times. Still, there is a sudden increase in the plastic failure and post-peak failure stages. (2) The fine sandstone specimens’ input energy, elastic energy, and dissipative energy density increased nonlinearly during the cyclic loading tests. Owing to the closure of the primary pores in the microfracture compaction stage, dominant matrix deformation in the elastic deformation stage, and development and expansion of cracks in the plastic failure stage, with an increase in the cyclic loading and unloading times, the dissipative energy ratio first decreased and then increased. (3) Based on the tangential modulus, residual strain, and Felicity ratio, fine sandstone’s cyclic loading and unloading stress-strain curves were divided into microfracture compaction, elastic deformation, and plastic failure stages. The piecewise constitutive model of fine sandstone constructed with accumulated AE energy was the closest to the real stress-strain curve of the rock, and the deviations of the peak stress and peak strain from the actual situation were 0.52% and 0.84%, respectively. The research results can provide theoretical support for identifying the degree of rock damage in western mining areas and ensure the safe and efficient development of coal resources.

Development of Local Ductile Failure Assessment Method and Its Application to Four Alloys—Part II: Incorporation of the Effect of Lode Angle

Abstract In order to guarantee the presence of adequate margin against ultimate fracture, it is essential to establish a reliable methodology for estimating ductile fracture behavior of structures. Following the development of equations for describing true stress–strain relation and their application to notched bar and grooved plate specimens made of four materials used in nuclear power plants without or with the effects of damage depending on stress triaxiality factor, incorporation of the effect of the Lode angle was explored for improving the consistency with the test results. Dependency of true rupture strain on the Lode angle as well as on the stress triaxiality factor was introduced in the new approach. Damage calculated by summing a ratio of equivalent plastic strain increment to the true rupture strain was used for determining failure point and reduction of preceding deformation resistance. Furthermore the effect of the Lode angle on the resistance against plastic deformation was introduced in a separate way to address some situation. After examining the behavior of these parameters in each specimen type, related material constants for each combination of material and temperature were determined by iterating calculations with different constants and comparisons of predicted load–displacement relations with experimental ones. Although constants needed to be adjusted according to materials and temperatures, reasonable agreements were achieved eventually between the experimental and predicted load–displacement curves for all the specimen types investigated. In particular, the maximum load and the displacement at failure could be predicted within an error of about 5% and 10%, respectively, providing compelling evidence for the soundness of the approach.

Sexual Dimorphism in the Downregulation of Extracellular Matrix Genes Contribute to Aortic Structural Stiffness in Female Mice.

The contribution of sex hormones to cardiovascular disease, including arterial stiffness, is established; however, the role of sex chromosome interaction with sex hormones, particularly in women, is lagging. Arterial structural stiffness depends on the intrinsic properties and transmural wall geometry that comprise a network of cells and extracellular matrix (ECM) proteins expressed in a sex-dependent manner. In this study, we used four-core genotype (FCG) mice to determine the relative contribution of sex hormones versus sex chromosomes or their interaction with arterial structural stiffness. Gonadal intact FCG mice included females (F) and males (M) with either XX or XY sex chromosomes (n=9-11/group). We isolated the thoracic aorta, and a tissue puller was used to assess structural resistance to changes in shape under control, collagenase, or elastase conditions. We determined histological collagen area fraction and evaluated aortic ECM genes by PCR microarrays followed by RT-qPCR. Stress-strain curves showed higher elastic modulus (P<0.001), denoting decreased extensibility in XXF compared to XYF aortas, which were significantly reversed by collagenase and elastase treatments (P<0.01). Aortic gene expression analysis indicated a significant reduction in Emilin1, Thbs2, and Icam1 in the XXF versus XYF aorta (P<0.05). Uniaxial stretching of XXF aortic vascular smooth muscle cells indicated decreased Thbs2, Ctnna1, and Ecm1 genes. We observed a significant (P<0.05) reduction in Masson's trichrome staining in collagenase but not elastase-treated aortic rings compared to the control. The increased aortic elastic modulus in XXF compared to XYF mice suggests a decrease in aortic extensibility mediated by a reduction in ECM genes.

Representation of stress strain curve for compression behavior of concrete using trigonometric function model

Representation of stress strain curve for compression behavior of concrete using trigonometric function model

Study on short-term mechanical properties of multi-reinforced steel-plastic composite pipe under internal pressure

A multiple-reinforced steel-plastic composite pipe (MRSPCP) is a new type of composite pipe developed in China recent years. The MRSPCP is composed of high-density polyethylene (HDPE) matrix, steel-wire mesh, and steel strip. It is an improved version of the traditional structural wall pipe, and it is able to carry both external and internal pressures. Nowadays, it has been employed in many projects that require large diameter and high flow media transportation, such as water distribution systems, drainage systems, agricultural irrigation systems. As the MRSPCP is newly developed, its mechanical properties and failure mechanism are not clear, and its design method lacks theoretical basis, so this paper carries out the experimental, theoretical and simulated research to investigate the short-term mechanical properties of the MRSPCP. Firstly, uniaxial tensile tests are carried out to acquire the mechanical properties of the constituents. As the steel wire is curly and it is hard to get the stress-strain relationship directly, an inverse identification method was applied to determine the mechanical parameters of a bilinear model representing the steel-wire mechanical behavior. Moreover, short-term burst tests of the MRSPCP are carried out to assess its mechanical performance and provide data for the verification of the theoretical and simulated research. Secondly, a theoretical model is established to calculate the failure pressure by constructing force equilibrium relationship along the axial and hoop directions of the MRSPCP respectively, based on elastic mechanics. In the end, a finite element model of MRSPCP is established, considering the nonlinear mechanical property of the materials. Both the theoretical and the simulated results agrees well with the burst test result, with the relative error of only −13.18% and −4.41% respectively. As the finite element model not only provides more accurate result, but also it can demonstrate contour plots of different constituents inside the MRSPCP, the model is used to study the effects of the pipe thickness, composite strip winding angle and steel-wire diameter on the mechanical properties of MRSPCP. This study might be a guide for the design and safe application of the MRSPCP and similar composite pipes.

Mechanical Properties and Constitutive Model of High-Mass-Fraction Pressed Tungsten Powder/Polytetrafluoroethylene-Based Composites

Heavy metal powders driven by explosions can enhance the near-field lethality of explosive warheads by forming a quasi-pressure field while reducing collateral damage at medium and long ranges. Incorporating polymers into high-content metal powders prevents powder sintering under explosive high pressure, enhancing dispersion uniformity and making them promising for controllable warhead applications. To describe the mechanical behavior of materials under impact loading, this paper investigates the dynamic and static mechanical properties and constitutive modeling of tungsten powder/polytetrafluoroethylene (PTFE) composites. Quasi-static compression tests and split Hopkinson pressure bar (SHPB) dynamic tests were conducted on composites with varying tungsten contents (0 wt%, 70 wt%, 80 wt%, and 90 wt%) and particle sizes (200 μm, 400 μm, and 600 μm), obtaining compressive stress–strain curves over a strain rate range of 0.001 to 3610 s−1. The compressive strength of the composites slightly decreased with increasing tungsten particle size but increased with higher tungsten content. Under quasi-static compression, the compressive strength of the composites with 70 wt% and 80 wt% tungsten was lower than that of pure PTFE. This was due to the bonding strength between the tungsten particles and the resin being weaker than the cohesion within the resin. Additionally, the random distribution of the tungsten particles in the matrix led to shear cracks propagating along the phase interfaces, reducing the compressive strength. The compressive strength of the composites with 90 wt% tungsten exceeded that of pure PTFE, as the packed arrangement of the tungsten particles increased the material strength through particle extrusion and friction during compression. Under dynamic impact, the compressive strength of the composites was higher than that of pure PTFE, primarily due to particle extrusion and friction effects. The composites exhibited significant strain rate sensitivity, with both the compressive strength and critical strain increasing quasi-linearly with the strain rate. Based on the experimental data, a damage-modified Zhu–Wang–Tang (ZWT) viscoelastic model was employed to fit the data, effectively characterizing the uniaxial compressive constitutive behavior of tungsten powder/PTFE composites.