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A non-orthogonal fractional plastic damage constitutive model for porous rock-like materials considering porosity evolution
This paper focuses on the evaluation of the macroscopic elastoplastic mechanical behavior of porous rock-like geomaterials. It is assumed that the porous matrix of the material contains randomly distributed spherical micro-voids, and the solid phase obeys to the Drucker–Prager criterion, then its yield behavior is described by an analytical strength homogenization criterion of porous media. To consider the non-associated plastic flow, a fractional non-orthogonality of plastic flow is introduced without using a plastic potential. Then the interaction of two different damage mechanisms is incorporated in the constitutive relation, the first is the damage induced by plastic deformation and the other is the influence of void nucleation, growth and coalescence during the deformation process. Within this framework, a series of numerical studies is conducted to clarify the influence of initial porosity and its evolution on macroscopic mechanical properties. The numerical results show that the proposed model is able to capture the main mechanical features of the studied porous rock-like material.
A non-orthogonal fractional plastic damage constitutive model for porous rock-like materials considering porosity evolution
This paper focuses on the evaluation of the macroscopic elastoplastic mechanical behavior of porous rock-like geomaterials. It is assumed that the porous matrix of the material contains randomly distributed spherical micro-voids, and the solid phase obeys to the Drucker–Prager criterion, then its yield behavior is described by an analytical strength homogenization criterion of porous media. To consider the non-associated plastic flow, a fractional non-orthogonality of plastic flow is introduced without using a plastic potential. Then the interaction of two different damage mechanisms is incorporated in the constitutive relation, the first is the damage induced by plastic deformation and the other is the influence of void nucleation, growth and coalescence during the deformation process. Within this framework, a series of numerical studies is conducted to clarify the influence of initial porosity and its evolution on macroscopic mechanical properties. The numerical results show that the proposed model is able to capture the main mechanical features of the studied porous rock-like material.
A non-orthogonal fractional plastic damage constitutive model for porous rock-like materials considering porosity evolution
Acta Geotech.
Cui, Xiaoyan (author) / Cao, Yajun (author) / Jin, Yanli (author) / Zheng, Zhi (author) / Shen, Wanqing (author)
Acta Geotechnica ; 19 ; 3185-3198
2024-05-01
14 pages
Article (Journal)
Electronic Resource
English
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