Multi-scale structural characteristics and the damage evolution mechanism of rock under load

Ren, Yuying; Sun, Yida; Meng, Xiangxi

doi:10.1016/j.matlet.2022.133430

Cited by 6 publications

(2 citation statements)

References 7 publications

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“…According to meso-damage mechanics, under external load, the damage of the material starts from the initial meso-damage, which determines the mesomechanical properties of the material and ultimately affects the macroscopic mechanical properties of the material. This means that rock damage is the result of the synergistic action of multiscale structures (Toi and Kiyosue, 1995;Yuan et al, 2013;Ren et al, 2023). As can be seen in Figure 5B, there were many pores and other initial meso-damage on the meso-tensile fracture surfaces of RLM disks, which was similar to the initial pore structure of natural rock materials (Yang et al, 2023).…”

Section: Stress-strain Curves and Meso-damage Fracture Characteristicsmentioning

confidence: 52%

Rock-like material under large diameter SHPB dynamic splitting tension: meso-damage mechanical behavior and stress wave propagation model

Yang,

Xu,

et al. 2024

Front. Mater.

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The mechanical behavior of splitting tensile damage and the law of stress wave propagation of rock-like materials (RLM) are of great significance to further reveal the dynamic disaster mechanism of the deep rock mass. The meso-damage mechanical behavior and stress wave propagation characteristics of RLM disks under impact splitting were studied by using a large diameter split Hopkinson pressure bar (SHPB). In terms of dynamic damage, the splitting tensile stress-compression strain curves of RLM disks obviously showed three stages of mechanical behavior evolution: initial elastic-plastic deformation, pre-peak plastic damage, and post-peak brittle fracture failure. The macro-damage of RLM disks increased with the increase of strain rate. The meso-tensile fracture was the result of both the initial meso-damage and the impact splitting meso-damage. The dynamic splitting damage variable defined based on the damage fracture energy can accurately describe the damage evolution characteristics of impact splitting on RLM disks. In the aspect of stress wave propagation, the peak value of transmission stress showed an advanced effect with the increase of incident stress wave. In the early stage (0–50 μs), the transmission stress wave ratio (σT/σI) increased with the increase of strain rate, while in the later stage (82–200 μs), the transmission stress wave ratio (σT/σI) decreased with the increase of strain rate. The stress wave propagation law in the process of impact splitting on RLM disks was clearly revealed based on the stress wave propagation model established by the one-dimensional elastic stress wave theory. Finally, the dynamic mechanical mechanism of splitting damage and fracture of RLM disks under different strain rates was discussed deeply.

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Section: Stress-strain Curves and Meso-damage Fracture Characteristicsmentioning

confidence: 52%

Rock-like material under large diameter SHPB dynamic splitting tension: meso-damage mechanical behavior and stress wave propagation model

Yang,

Xu,

et al. 2024

Front. Mater.

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“…Rocks consist of many small mineral grains that form a strong but brittle framework in which intergranular boundaries, pores, cracks and joints are inevitable due to the conditions of origin and life cycle [ 1 , 2 , 3 ]. From the point of view of mechanics, such an inhomogeneous structure is characterized by a nonlinear load–displacement dependence.…”

Section: Introductionmentioning

confidence: 99%

Differential Energy Criterion for Brittle Fracture: Conceptualization and Application to the Analysis of Axial and Lateral Deformation in Uniaxial Compression of Rocks

Shekov

Kolesnikov

2023

Materials

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This paper discusses modeling the behavior and prediction of fracture of brittle materials. Numerous publications show that progress in this area is characterized by the emergence of a number of new models that meet the requirements of the mining industry, construction and other engineering practices. The authors focus only on one class of models, paying special attention to the compromise between simplicity of solution and versatility of the model. A new version of the model is proposed, taking into account the advantages of previous models. We present a differential energy criterion for brittle fracture substantiated, according to which, fracture occurs at a certain ratio of dissipated and stored (elastic) energy. Fracture is considered as the end of the deformation process with a virtual transformation of the initial material almost without cracks into a real material with cracks. The highest and lowest elastic moduli are analytically determined, respectively, on the ascending and descending branches of the stress–strain curve. A graphical version of the algorithm for determining the brittle fracture point on the post-peak branch of the stress–strain curve is proposed. The modeling results are consistent with the experimental data known from the literature.

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Experimental study on the evolution of rock microstructure under dynamic water pressure

2023

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Multi-scale structural characteristics and the damage evolution mechanism of rock under load

Cited by 6 publications

References 7 publications

Rock-like material under large diameter SHPB dynamic splitting tension: meso-damage mechanical behavior and stress wave propagation model

Rock-like material under large diameter SHPB dynamic splitting tension: meso-damage mechanical behavior and stress wave propagation model

Differential Energy Criterion for Brittle Fracture: Conceptualization and Application to the Analysis of Axial and Lateral Deformation in Uniaxial Compression of Rocks

Experimental study on the evolution of rock microstructure under dynamic water pressure

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