A damage model of mechanical behavior of porous materials: Application to sandstone

被引:28
作者
Li, M. Y. [1 ,2 ]
Cao, Y. J. [2 ,3 ]
Shen, W. Q. [2 ]
Shao, J. F. [2 ]
机构
[1] Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, Beijing 100190, Peoples R China
[2] Univ Lille, CNRS, LML, UMR 8107, F-59655 Villeneuve Dascq, France
[3] Hohai Univ, Geotech Res Inst, Nanjing, Jiangsu, Peoples R China
关键词
Homogenization; fast Fourier transform; plasticity; damage; porous material; GREEN TYPE MATRIX; APPROXIMATE MODELS; DUCTILE METALS; MACROSCOPIC CRITERION; NONLINEAR COMPOSITES; ELLIPSOIDAL CAVITIES; NONSPHERICAL VOIDS; NUMERICAL-METHOD; YIELD CRITERIA; FLOW RULES;
D O I
10.1177/1056789516685379
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
In this work, a multiscale model based on the Fast Fourier Transform (FFT) technique is applied to describe the mechanical behavior of porous materials. The effects of the microstructures (such as pore shape, number, size, distribution and orientation) on the overall strength of the porous medium and its microstress distribution are fully studied. The elastoplastic model is further extended by including a damage process. The influences of microstructure on the damage evolution of the porous medium are discussed and illustrated numerically. Then the proposed multiscale damage model is applied to study the macroscopic behavior of porous sandstone. According to the microstructure of the studied material, a representative elementary volume with randomly distributed spherical pores is considered. The solid phase of the sandstone is assumed to obey the Drucker-Prager criterion. Taking advantage of the FFT-based method, the evolution of generated damage is clearly illustrated during the loading process at the microscopic level. Comparisons between numerical results and experimental data show the efficiency of the proposed numerical model.
引用
收藏
页码:1325 / 1351
页数:27
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