Title of Paper:岩石紧凑拉伸断裂过程及其尺寸效应的三维数值模拟

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Date of Publication:2022-06-30

Journal:计算力学学报

Affiliation of Author(s):建设工程学部

Issue:3

Page Number:334-340

ISSN No.:1007-4708

Abstract:A new numerical code RFPA3D was developed to simulate rock failure process by taking the heterogeneities of mechanical properties into consideration. Parameters such as peak strength, elastic modulus and Poisson ratio are randomly distributed among all elements in the numerical model. A simple constitutive law was introduced into the model, and massive parallel computing method was applied to calculate the stress and displacement field. Five specimens with a single pre-existing crack were prepared to undertake direct tension test. The specimens with different scales have the same mechanical properties. The fracture process, including crack propagation and coalescence, was obtained as well as the complete stress-strain curves. Different from other numerical code, RFPA3D can simulate the stress field and strain field during the whole loading process. The crack propagation along a three-dimensional curved path, much more complicated than two-dimensional cracks. The relation between peak strength and scale fits the rule of scale effects proposed by other investigators in experimental studies. Another three groups of specimens with different homogeneity and different sizes are undertaken uniaxial tensile tests. It concludes that the macro scale effects do not only result essentially from heterogeneities on mesoscopic scale. The RFPA3D model is proved to be a useful and effective tool to analyze the failure process of brittle materials.

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