Meso-scale modelling of the size effect on dynamic compressive failure of concrete under different strain rates

Jin, Liu; Yu, Wenxuan; Du, Xiuli; Zhang, Shuai; Li, Dong

doi:10.1016/j.ijimpeng.2018.10.011

Cited by 160 publications

(43 citation statements)

References 34 publications

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“…is view was also supported by [8]. Scholars have found that peak strain increases with strain rate [9][10][11][12]. Chen et al [5,13,14] studied the tensile strength of cement-based materials and compared the strain rate sensitivity of concrete under tension and pressure.…”

Section: Introductionmentioning

confidence: 89%

Influence of Water Pressure on the Mechanical Properties of Concrete after Freeze-Thaw Attack under Dynamic Triaxial Compression State

Wang

et al. 2019

Advances in Materials Science and Engineering

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This study aims at determining the effect of water pressure on the mechanical properties of concrete subjected to freeze-thaw (F-T) attack under the dynamic triaxial compression state. Two specimens were used: (1) a 100 mm × 100 mm × 400 mm prism for testing the loss of mass and relative dynamic modulus of elasticity (RDME) after F-T cycles and (2) cylinders with a diameter of 100 mm and a height of 200 mm for testing the dynamic mechanical properties of concrete. Strain rates ranged from 10−5·s−1 to 10−3·s−1, and F-T cycles ranged from 0 to 100. Three levels of water pressure (0, 5, and 10 MPa) were applied to concrete. Results showed that as the number of F-T cycles increased, the mass loss rate of the concrete specimen initially decreased and then increased, but the RDME decreased. Under 5 MPa of water pressure and at the same strain rate, the ultimate compressive strength decreased, whereas the peak strain increased with the increase in the number of F-T cycles. This result is contrary to the variation law of ultimate compressive strength and peak strain with the increase in strain rate under the same number of F-T times. With the increase in F-T cycles or water pressure, the strain sensitivity of the dynamic increase factor of ultimate compressive strength and peak strain decreased, respectively. After 100 F-T cycles, the dynamic compressive strength under all water pressure levels tended to increase as the strain rate increased, whereas the peak strain decreased gradually.

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Section: Introductionmentioning

confidence: 89%

Influence of Water Pressure on the Mechanical Properties of Concrete after Freeze-Thaw Attack under Dynamic Triaxial Compression State

Wang

et al. 2019

Advances in Materials Science and Engineering

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“…In the mesoscale concrete model, K&C model and the corresponding parameters detailed in Table 1 are used for the mortar matrix. This approach has been adopted by previous studies and has been proven to yield reasonable simulation results (Chen et al, 2015; Hao and Hao, 2016; Jin et al, 2019). It allows for a direct evaluation of the aggregate effects on the SHPB results by comparing the simulation results with those in section “Parametric simulations.” The coarse aggregates considered in this study are crushed granite rock with the material DIFs adopted from Hao and Hao (2016) as…”

Section: Parametric Simulationsmentioning

confidence: 99%

Numerical study of the compressive behavior of concrete material at high strain rate with active confinement

Chen

Hao

2019

Advances in Structural Engineering

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“…Data with “∗” are quoted from Zhou and Liu [28,29], data with “^” are parameters by above formula and the other parameters by repeated trial.…”

Section: Figurementioning

confidence: 99%

Meso-Scale Simulation of Concrete Uniaxial Behavior Based on Numerical Modeling of CT Images

et al. 2019

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It is important to study the failure mechanism of concrete by observing the crack expansion and capturing key structures at the mesoscale. This manuscript proposed a method for efficiently identifying aggregate boundary information by X-ray computed tomography technology (CT) and a discrete element modeling method (DEM) for equivalent random polygon aggregates. This method overcomes the shortcomings of the Grain Based Model (GBM) which is impossible to establish a mesoscopic model with a large difference in grain radius. Through the above two methods, the CT slice images were processed in batches, and the numbers of edges, axial length, elongation of the aggregate were identified. The feasibility of the method was verified by the comparison between experimental and simulating results. Three mesoscopic models for different porosities were established. Based on aggregate statistics, this manuscript achieved the meso-model recovery to the maximum extent. The test results show that the crack appeared at the tip of the aggregate firstly, and then the broken boundary was applied in the direction of the applied load and around the pores. Finally, the crack was selectively expanded under the axial force. During the loading process, the minor principal stress was normally distributed. As the porosity and loading time increased, the heterogeneity increased.

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Meso-scale modelling of the size effect on dynamic compressive failure of concrete under different strain rates

Cited by 160 publications

References 34 publications

Influence of Water Pressure on the Mechanical Properties of Concrete after Freeze-Thaw Attack under Dynamic Triaxial Compression State

Influence of Water Pressure on the Mechanical Properties of Concrete after Freeze-Thaw Attack under Dynamic Triaxial Compression State

Numerical study of the compressive behavior of concrete material at high strain rate with active confinement

Meso-Scale Simulation of Concrete Uniaxial Behavior Based on Numerical Modeling of CT Images

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