Tensile Damage Research Articles

Research on Particle Size and Energy Consumption Law of Hard Coal Crushing under Impact Load Based on SHPB Test

To study the particle size distribution and energy variation law of hard coal under a load, an impact compression test of hard coal specimens under different impact loading conditions was carried out using a Φ50 mm diameter Separate Hopkinson Press Bar (SHPB) test system. We implemented the theory of dynamic impact energy of rock to establish the calculation expression of hard coal impact crushing energy dissipation, and we established the Weibull distribution model of a crushing body to analyze the impact velocity in relation to the particle size distribution of hard coal crushing and crushing energy consumption. The results demonstrate that due to the different original states of the specimens, the damage to the specimens under static action is in the mode of conjugate plane shear damage, single bevel shear damage, and tensile damage. The damage process of the specimen under impact load loading is divided into three stages: elastic deformation, elastic–plastic deformation, and plastic softening, while the increase in the strain rate caused the peak stress of the specimen to increase. The Weibull distribution can characterize the impact crushing size distribution of hard coal specimens very well. The parameter of coal rock crushing degree is a power function that is influenced by the impact velocity; the greater the impact velocity, the higher the coal rock crushing degree, but the characteristic index of coal rock crushing fluctuates with the increase in impact velocity. As the impact velocity increases, the incident energy and reflected energy increase linearly, while the transmitted energy increases first and then decreases. The dissipation energy of coal rock crushing also increases linearly with the impact velocity. There is no obvious regular change between the energy dissipation rate of coal rock and impact velocity during impact damage, and the dissipated energy of macroscopic crushing only accounts for 10~20% of the incident energy; most of the energy is used for damping loss and damage loss.

Experimental Study of Dynamic Responses of Special Tunnel Sections under Near-Fault Ground Motion

Data surveys show that near-fault ground motion does great damage to tunnel structures, especially the portal section and fault zone. In this paper, a series of shaking table model tests of near-fault tunnels were conducted and the surrounding-rock fault-zone-lining model of the near-fault tunnel was established. Accelerometers and strain gauges were arranged at specific locations, and the experimental process of earthquake occurrence was simulated by inputting seismic waves of different working conditions, which obtained the characteristics of stress, damage and deformation of the tunnel model. The tested results showed that the acceleration response of the tunnel portal section was close to the wave shape of the inputted seismic wave, and the acceleration response of the arch shoulder, arch waist and arch foot was more prominent. The internal force of lining at the arch shoulder and arch foot was greater than that at the arch crown, and the peak internal force appeared at the arch foot. The internal force and the maximum or minimum principal stress of the lining under impulse ground motion were larger than those under non-impulse ground motion. Additionally, the surrounding rock had a filtering effect on the high-frequency band of seismic waves. Meanwhile, when the geological characteristics of the fault zone were poor, and the tensile damage first appeared at the arch foot, the compressive damage appeared at the junction of the surrounding rock and fault zone. This study will offer a practical guidance for tunnel engineering earthquake damage.

Blast Performance and Damage Evaluation of High Arch Dams Subjected to Far-Field Underwater Explosions: Consideration of Joints

The blast performance of 300-m-high arch dams is an important subject which has been studied widely over the years. An arch dam is convex on the upstream face, and the load is transmitted along the arch axis to the abutments at the ends of the dam. However, the integrity of arch dams is affected by the transverse contraction joints. The blast resistance performance of a 300-m-high arch dam subjected to far-field underwater explosion was investigated considering contraction joints. The acoustic–structural method was employed to model the underwater explosion loads and the interactions among the dam–reservoir–foundation system. To verify the reliability of the acoustic–structural method, a 1∶200-scale model of an arch dam subjected to far-field underwater explosion was tested. A zero-thickness cohesive element was employed to model the mechanical behavior of contraction joints with grouting. Nonlinear dynamic response and damage progress of the high arch dam with transverse contraction joints to the far-field underwater explosion were investigated in terms of peak displacement, velocity, and damage modes. The tensile damage mechanism of the arch dam subjected to the far-field underwater explosion was discussed. The damage modes and deformation mechanism of high arch dams at the different positions of initiation point were presented. A damage index based on the damaged area in the downstream face and foundation face is proposed to evaluate the blast performance of high arch dams subjected to far-field underwater explosions. The results show that the contraction joints have a certain influence on the nonlinear dynamic and damage modes of high arch dams subjected to the far-field underwater explosion. The damage is larger with explosive charges near the one-quarter arch ring in the weak stiffness bank due to the asymmetry of the arch dam.

Numerical assessment of the influences of uplift pressure in joints on the seismic response of an arch dam having a jointed foundation

Joints, which are usually located in the abutments of dams, play a vital role in the seismic stability evaluation of arch dams. This paper presents a comprehensive numerical investigation of the influence of uplift pressure in joints on the seismic response of an arch dam, with a focus on the interaction between the dam and the rock wedges. For this study, the Bakhtiari arch dam, having one rock wedge at each abutment, was chosen as a case study, and three distinct finite element models of the dam were developed. Three components of El Centro were applied to the dam's foundation, and the influences of dam-rock wedge interaction on the crest displacement time history and tensile damage of the arch dam were investigated. Four different scenarios were taken into account. The results indicated that taking uplift pressure in joints into account has important effects on the dam responsesWedge;Arch dam.

Seismic Response and Damage Analysis of Shield Tunnel with Lateral Karst Cavity under Oblique SV Waves

The dynamic effects of the lateral karst cavity on the shield tunnels under different incident angles of seismic waves are investigated by numerical analysis in this paper, based on the Dalian Metro Line 5 project. The viscous-spring artificial boundary is applied and verified to guarantee the accuracy of seismic input. A simplified finite element model of shield tunnel is established based on the equivalent bending stiffness model. This paper compares the seismic response characteristics and damage states of the tunnel under different incident angles by analyzing the axial deformation, stress distribution, and damage severity, respectively. A new damage state classification criterion is proposed by introducing the relationship between cracks and tensile damage. The results show that the tunnel’s affected scope by the lateral karst cavity is twice the cavity diameter. As the incident angle increases, the tunnel’s displacement and stress increase and show the structural spatial difference, and the tunnel’s damage state is increasingly severe. The displacement and stress reach the max values when the incident angle is 30°. The cracks along the axial direction extend on the outer surface of the vault and bottom, and the crack width is greater than 0.2 mm, as that angle is 30°. The damage severity at the tunnel’s central zone is minimum along axial directions during seismic action, while the damage concentration occurs on the bottom at the end of seismic. The lateral karst cavity plays an energy dissipation and vibration reduction role to a certain extent, but it also aggravates the local damage. This paper can serve as a reference for the seismic design of tunnels in karst regions.

Analysis of Bottomhole Rock Stress in Deep-Well Drilling Considering Thermal-Hydro-Mechanical Coupling

Drilling is a key step in the exploitation of deep oil and gas resources. In order to clarify the stress state of the rocks and the mechanism of rock breakage in deep-well drilling, a thermal-hydro-mechanical coupling model for deep-well drilling was established, and the effects of drilling on the temperature, pressure, and stress in the formation were studied. Furthermore, the effects of the formation parameters and wellbore parameters on the bottomhole stress were analyzed. The results revealed that after the formation was drilled, the temperatures in different horizontal in situ stress directions were not significantly different, but the difference in the pore pressure between the maximum and minimum horizontal stress directions was large. The average effective stress at the bottom of the hole was the smallest, and in some areas, it was tensile stress. For deep-well drilling, as the formation pressure increased, the in situ stress increased, and the permeability decreased, leading to greater average effective stress of the bottomhole rock. As a result, it was harder to break the rock, and the drilling efficiency decreased. Reducing the wellbore pressure and wellbore temperature is conducive to forming tensile stress near the borehole axis in the bottomhole, causing tensile damage. The average effective stress of the formation near the shoulder of the drill bit was compressive stress, and it is advisable to take advantage of the rock shear failure characteristics to improve the drilling efficiency in this area. The results of this study can help us to understand the stress state of the bottomhole rocks and the mechanism of rock breakage and can provide a reference for the optimization of drilling tools and drilling parameters in deep-well drilling.

Investigation on early-age cracking resistance of basalt-polypropylene fiber reinforced concrete in restrained ring tests

The restrained shrinkage deformation of concrete structures at an early age is the main reason for cracking. Basalt-polypropylene fiber can reduce the shrinkage strain and cracking potential of concrete effectively. Investigation on cracking resistance of basalt-polypropylene fiber reinforced concrete (BPFRC) at early age by restrained ring test remain lacking. This study conducted free shrinkage test and restrained shrinkage test to analysis the early-age cracking resistance of BPFRC. The experimental results showed that incorporating basalt fiber and polypropylene fiber into concrete could decrease the free shrinkage and restrained shrinkage of concrete matrix and reduce the maximum theoretical elastic stress, actual maximum residual stress and relaxed stress, among which, the better positive effect was achieved when basalt fiber and polypropylene fiber hybridized. A numerical finite element simulation model was successfully carried out to predict the time-dependent maximum tensile stress in the concrete ring. Importantly, the damage evaluation of restrained shrinkage concrete ring was investigated based on the relations of the compressive (dc) and tensile (dt) damage factors with inelastic strains of BPFRC proposed in this paper, and a good agreement between simulation and experimental test had been observed. The findings in this study would promote the development and application of BPFRC.

Effect of oblique bolt arrangement on flexural behavior of segmental joint for shield tunnel

As the width of segments increases, segmental joints containing three oblique bolts are increasingly used while their flexural behavior is still not clear. Therefore, this paper presents a comprehensive investigation on the flexural behavior of such joints; and the effects of bolt arrangement are also highlighted. A series of full-scale experiments and numerical simulations are first performed to reveal the typical flexural behavior and failure characteristics of the joint with one single oblique bolt. Then, the verified numerical model is extended to investigate the influence of different oblique bolt arrangements (i.e. number and direction) on the joint flexural behavior under different axial forces. Five bearing stages can be identified during the whole loading process of joints, and they are separated by the bolts tension, concrete severe damage, contact of the segment top, and joint failure. Under small axial force, the joint failure under the positive moment is dominated by the tensile damage of concrete around bolt holes; while the compressive damage of concrete at the same position controls the joint failure under the negative moment. The concrete damage area changes to the compression zone as the axial force increases. The oblique bolt arrangement has little effect on the identification of five-stage bearing process of such segmental joints, but increasing the number of bolts can improve the flexural stiffness and ultimate bearing capacity of joints. Moreover, the joint containing three cross oblique bolts has a stronger flexural capacity than that containing three parallel bolts under small axial forces, which is because the change of the bolt direction avoids the connection of tensile damage zones around the bolt holes. However, these effects of bolt arrangement fade away as the axial force increases.

Study on Damage Evolution of Tunnel Lining under Strike-Slip Fault Movements

For the purpose of investigating the damage mechanism and failure characteristics of tunnel lining under the strike-slip fault movements, a three-dimensional elastoplastic finite element model was established in the present study including a railway tunnel across an active strike-slip fault. With the assistance of this numerical model, the tensile and compressive damage, plastic strain development process, and shear failure of the secondary lining at different fault plane positions were analyzed, and further, the damage laws of the secondary lining at different fault displacement and tunnel-fault intersection angles were summarized. The simulation results showed that when the maximum imposed fault displacement is 30 cm, the most unfavorable fault plane appears at the junction between the moving block and the fracture zone, and serious tensile cracks and shear failures occur on each fault rupture plane. Besides, the maximum plastic strain and compressive damage are distributed in the vault and invert. In addition, with the increase of the fault displacement, the axial strain of the secondary lining increases as well, of which the main part shows the tensile strain. Interestingly, with the decrease of the crossing angle, the axial strain gradually changes from the tensile strain to the compressive strain, which is consistent with the direction of the fault angle. Furthermore, the tensile and compressive damage of the secondary lining increases with the increase of movement distance. At the same time, the tensile damage along the tunnel ring develops, and the compressive damage propagates mainly in tunnel vault and invert. With the decrease of the crossing angle, the degree of the tensile damage in the lining reduces, as well as its range. The compressive damage area of the lining develops from the vault and inverted arch to the tunnel wall on both sides, which has a trend of penetrating the side walls on both sides. The distribution area and maximum value of the overall lining damage indices in tensile (OLDT) and overall lining damage indices in compressive (OLDC) increase with the increase of fault movement distance. With the decrease of the crossing angle, the distribution range and maximum value of OLDT decrease, and the distribution range of OLDC increases, while the maximum value basically remains the same. The research results of the present work can provide reference for the antidislocation design of railway tunnels crossing strike-slip faults.

A novel dynamic constitutive model for UHPC under projectile impact

Aimed at numerically predicting the impact resistance and damage pattern of ultra-high performance concrete (UHPC) under projectile impact, this study established a novel dynamic constitutive model for UHPC based on an improved Karagozian & Case concrete (KCC) model newly proposed by authors. Firstly, the established model is introduced, which considers the complex dynamic mechanical properties of UHPC, including the Lode-dependence, strain rate effect, compressive strain hardening and softening, tensile strain softening, volumetric compaction, and shear dilation. Particularly, a four-stage strain softening tensile damage model is adopted for UHPC. Then, the established model is embedded in the commercial hydrocode LS-DYNA as a user defined material model. According to the existing test data of UHPC, the failure surface, strain rate effect, equation of state, and damage model parameters are calibrated for the established model. For comparison, the parameters of the KCC model are also calibrated accordingly. To verify the calibrated material model parameters, single element tests are conducted under tensile and compressive loadings. Finally, the high velocity impact tests performed on both the semi-infinite targets and finite-depth panels with varying striking velocity are simulated, where the established model and the KCC model are respectively adopted for UHPC. It demonstrates that the established model reproduced the impact resistance and damage pattern of UHPC under projectile impact accurately, while the KCC model cannot reflect the dynamic response of UHPC satisfactorily.

A New Uniaxial Tensile Model for Foam Metal/Epoxy Interpenetrated Phase Composites

Foam metal/epoxy interpenetrating phase composite is a new type of composite material with interpenetrating continuity in composition, which exhibits different intrinsic relationships under different stress states in tension and compression, and it is necessary to study the intrinsic relationships in the tensile state in depth. A mesoscopic damage-based tensile intrinsic model is developed, and the elasto-plastic tensile intrinsic equations of the representative volume element are derived based on small deformation theory and total strain theory, as well as the assumptions of equal stress and equal strain. The tensile strengths of nickel-iron foam/epoxy interpenetrated phase composites in three different sizes and their constituent phases were measured, and it was shown in the results that the composite of three-dimensional network interpenetration with high-strength foam metal and epoxy resin formed a weak surface inside the material, and did not significantly improve the tensile strength of the composites. The tensile instantonal equations and damage instantonal equations of nickel-iron foam/epoxy interpenetrated phase composites were predicted by the method of inversion, and the applicability and high accuracy of the tensile intrinsic model were verified in comparison with the measured results.

Early properties and modeling of cemented superfine tailings backfill containing sodium dodecyl sulfate: Microstructure, mechanics, and acoustics

Primary microcracks exist within brittle materials such as cemented superfine tailings backfill (CSTB), and these microcracks control the damage mechanism and determine the structural strength of the brittle material. The early damage evolution mechanism and the constitutive model of CSTB under the consideration of initial defects are analyzed and discussed from macroscopic and microscopic viewpoints by using acoustic emission (AE), scanning electron microscopy (SEM), and nuclear magnetic resonance (NMR) techniques. It is demonstrated that AEA inclusion can slow the hydration reaction inside the CSTB, reducing the number of hydration products and hence the density of the CSTB's internal structure. The amount of AEA incorporated was correlated with the elastic modulus, and the initial damage to the CSTB was quantified as a result. As the initial damage increases, the effective contact area inside the CSTB decreases, and the damage form of the CSTB changes from predominantly tensile damage to predominantly flaking areas in patches, accompanied by a weakening of the AE signal. Analyzed from the perspective of the AE energy rate, the incorporation of AEA reduces the energy storage capacity of CSTB, and with the increase in AEA content, it further leads to a sharp decrease in the energy released from CSTB. The early damage constitutive model of CSTB with different initial damage proposed in this paper agrees well with the experimental data and can provide a reference for the design of CSTB in structural filling.

The Fatigue-Creep Coupling Effect of Asphalt-Mixture Damage Model under Different Loading Frequencies

To evaluate the fatigue-creep damage coupling effect of asphalt mixture under different loading frequencies, three tests—tension-compression fatigue, direct tensile fatigue, and static creep—were carried out with haversine cyclic loading at four loading frequencies of 5, 10, 20, and 50 Hz, respectively. In this research, the elastic modulus was selected as a damage variable for evaluation, and the evolution of fatigue damage and creep damage was analyzed by the Chaboche model and the Kachanov model, respectively. Then, based on haversine fatigue stress decomposition, tension-compression fatigue damage, direct tension fatigue damage, and creep damage under four loading frequencies were compared, and the fatigue-creep damage coupling model under those loading frequencies was established. The results indicated that, with the increase in loading frequency, the corresponding damage under the same standardized coordinate decreased, the growth rate of the damage evolution curve decreased, and the damage increased more rapidly when the asphalt mixture was damaged. It was found that the direct tensile fatigue damage of the asphalt mixture under repeated loads was not the direct superposition of pure fatigue and pure creep damage, but a coupling effect of fatigue-creep damage. In the direct tensile fatigue tests, the fatigue-creep damage coupling effect was negative and during the coupling effect the creep effect was more obvious. The model proposed in this result can better characterize the fatigue-creep damage coupling effect and damage evolution process of asphalt mixtures under different loading frequencies.

A hierarchical coupled multiscale analysis for the tensile damage behavior of notched 3D woven composites

A hierarchical coupled multiscale analysis for the tensile damage behavior of notched 3D woven composites

Numerical Study of Composite Percussive Drilling With Consideration of Heat Transfer Between Drilling Fluid and Bottom-Hole Rock in Geothermal Drilling

Abstract This article conducted a numerical study of composite percussive drilling with consideration of heat transfer between drilling fluid and bottom-hole rock in geothermal drilling, and analyzed influences of temperature, impact parameters, and heat transfer on rock fragmentation characteristics and energy transfer patterns. In this article, a model for a percussive drilling system based on the coupling of composite percussion and heat transfer was built. The rock fragmentation mechanism and energy transfer efficiency under the coupling of composite percussion and thermal exchange were studied. The main study results are as follows. As the temperature enhances, the total energy transfer efficiency declines, and the tensile damage area shrinks, while the outward extension of tensile cracks enhances. The total energy transfer efficiency enhances with the increase of the heat flux. The thermal load of the rock caused by heat transfer is essentially tensile stress. As the heat flux enhances, the tensile damage areas of the rock gradually expand and interconnect. Under the couplings of composite percussion and heat transfer, the heat transfer can intensify the rock breakage by tensile stress and enhance the energy transfer efficiency, and large deformation of the rock generated by composite percussion can promote the heat transfer process of drilling fluid and high-temperature rock, which in turn enhances the rock thermal damage. This study reveals coupling mechanisms of composite percussion and heat transfer and provides parameter optimization basis for composite percussive drilling in geothermal well.

Tensile creep properties and damage mechanisms of 2D‐woven C/HfC–SiC composites in high temperature

Abstract2D‐C/HfC–SiC composites were prepared by a combination of precursor infiltration and pyrolysis (PIP) and chemical vapor infiltration (CVI). Creep tests were performed at 1100°C in air under different stress conditions. Unlike most, C/SiC and SiC/SiC ceramic matrix composites only underwent primary and secondary creep stages, and the C/HfC–SiC composites underwent tertiary creep stage in the creep process. The reason was that the mechanical properties of C/HfC–SiC materials prepared by PIP + CVI methods were different from those prepared by traditional methods. The microscopic morphological analysis of the sample fracture showed that the oxidation products SiO2 and Hf–Si–O glass phases of the HfC–SiC matrix played a crack filling role in the sample during creep. In turn, it provided effective protection to the internal fibers of the sample. The creep failure of C/HfC–SiC composites in a high‐temperature oxidizing atmosphere was caused by the oxidation of the fibers. The total creep process was dominated by the oxidation of carbon fibers. It is noteworthy that there was the generation of HfxSiyOz nanowires in the samples after high‐temperature creep. The analysis of the experimental data showed that the creep stress had a linear negative correlation with the creep life.

Mechanical failure analysis of pultrusion glass fiber pipe based on acoustic emission technology

AbstractIn this study, the mechanical properties and damage modes of pultruded glass fiber/unsaturated polyester composite square pipe for automotive parts were investigated. The pipe structure, fiber mass content, dynamic mechanical analysis, tensile, and bending properties and acoustic emission detection damage mechanism of pultruded glass fiber composite pipe were studied. The structure of the cross‐section of the pultrusion pipe is like a sandwich composed of mat layers on both surfaces and a unidirectional fiber layer in middle. Based on the failure analysis of pipe by acoustic emission signal technology, it is found that the tensile damage process was considered into four stages, initial damage, mat layer fracture, intermediate damage, and fiber fracture; while the bending damage process can be divided into two stages as initial and overall damages.

Study on mechanical properties and damage characteristics of rice straw fiber-reinforced cemented tailings backfill based on energy evolution.

Low-cost and underutilized plant fibers can affect the mechanical behavior of cementitious materials such as cemented tailings backfill (CTB). This paper attempts to explore the mechanical properties and damage evolution characteristics of rice straw fiber (RFS)-reinforced CTB (RSFCTB) from the perspective of energy. A series of mechanical and microscopic tests were carried out on CTB and RSFCTB samples. On this basis, the energy evolution law and of the filling body under different stress paths were analyzed. Meanwhile, a damage variable based on dissipation energy was established, and the damage evolution process of the filling body was discussed. The results show that uniaxial compressive strength (UCS) of filling body first grew and then dropped with the enhancement of RSF content, and indirect tensile strength (ITS) was positively correlated with RSF content. Scanning electron microscope showed that RSF was encapsulated by hydration products, which promoted the bridging effect of RSF. The bridging effect of RSF improved the integrity of RSFCTB after compression failure and resulted in bending and asymmetric tensile cracks after tensile failure. The energy storage limit and dissipation energy of the filling body under different stress paths were enhanced due to the incorporation of RSF. The damage curve based on dissipation energy showed three stages of slow, steady, and fast damage under compressive loading. The damage curve of RSFCTB was located below CTB depending on the crack arresting effect of RSF. Moreover, the damage curve under tensile load shows three stages: slow, stable damage, and sudden increase in damage. The damage value of RSFCTB at the mutation point was increased, and the ability of RSFCTB to resist tensile damage was enhanced. The energy evolution and acoustic emission parameters were combined, and their development trends were similar, which proved that it was reasonable to characterize the damage of filling body based on the dissipated energy.

Study of Tensile Deformation and Damage Law in Undermatching X80 Pipeline Steel Welded Joints

This study used a digital imaging technique (DIC) to obtain the strain distribution at various locations in undermatching X80 pipe girth-weld joints under uniaxial tensile loading. In addition, the microstructure characteristics and deformation patterns in different regions were analyzed by scanning electron microscopy (SEM). The results showed that there was strain heterogeneity between the various regions of the welded joint. Strain concentration existed only in the 12.8 mm base metal heat-affected zone (HAZ) and only in the elastic deformation stage. There was strain concentration in the weld metal (WM) and both sides of the HAZ close to the near-fracture stage, and the maximum deformation was in the WM. When εM = 12.2%, the KC was 6.27 and the KF was 1.73, and the KF was 113% and 152% of the KC and the KG, respectively. The large number of slip strips generated indicated serious damage in the WM near the fracture stage. In the elastic deformation stage, the strain concentration of the N1 HAZ was caused by the softened ferrite. The maximum deformation of the WM near the fracture stage was caused by the large grain size and the non-uniform martensite–austenite (M–A) islands, which may also lead to better local toughness of the cover weld and further affect the fracture mechanism of the welded joint.

Macro-Mesoscale Mechanical Properties of Basalt-Polyvinyl Alcohol Hybrid Fiber-Reinforced Low-Heat Portland Cement Concrete.

To investigate the mechanical properties of hybrid basalt fiber (BF) and polyvinyl alcohol fiber (PVAF)-reinforced low-heat Portland cement concrete (LHPCC), two groups of concrete were formulated. The BF and PVAF were equal in the first group, and the total fiber contents were 0-0.4%. The second group was the total fiber content of 0.3% and the occupancy of BF in the hybrid fiber of 0, 25%, 50%, 75%, and 100%. Two groups of concrete were tested for compressive, splitting tensile, and flexural strengths to illustrate the enhanced mechanism of the mechanical properties of LHPCC by hybrid fiber. The best mechanical property enhancement was achieved when BF and PVAF were in equal proportions and the fiber content was 0.3%. Meanwhile, the test results for the mechanical properties were also compared with the predicted values of ACI 318 and Eurocode 2. Moreover, the hybrid BF-PVAF-reinforced concrete was regarded as a three-phase composite material consisting of fiber-reinforced mortar, coarse aggregate, and an interfacial transition zone. The axial compressive and splitting tensile strengths, damage processes, and mechanical strengthening mechanisms of concrete were investigated for different total fiber content at equal ratios of BF and PVAF, and the results were compared with the macroscopic mechanical test findings. The results show that the conclusion of the meso-simulation matches well with the test. Finally, the effect of aggregate and hybrid fiber content on the mechanical properties of LHPCC was predicted by a simulation. The results of this study can provide references for future mechanical modeling, performance studies, and practical engineering applications of LHPCC.