A 3D non-orthogonal plastic damage model for concrete

A plastic damage model with the non-orthogonal flow rule is developed, which is consisted of the damage part driven by plastic strain and the plastic part based on effective stress. In the damage characterization, the degeneration law of elastic stiffness is described by the damage variable in the f...

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Vydáno v:Computer methods in applied mechanics and engineering Ročník 360; s. 112716
Hlavní autoři: Zhou, Xin, Lu, Dechun, Du, Xiuli, Wang, Guosheng, Meng, Fanping
Médium: Journal Article
Jazyk:angličtina
Vydáno: Amsterdam Elsevier B.V 01.03.2020
Elsevier BV
Témata:
Algorithms
Concrete
Constitutive model
Cyclic testing
Damage
Damage assessment
Degeneration
Dilatancy
Error correction
Exponential functions
Hardening
Mechanical properties
Non-orthogonal flow rule
Numerical algorithm
Plastic deformation
Stiffness
Three dimensional models
Constitutive model
Concrete
Non-orthogonal flow rule
Damage
Dilatancy
Numerical algorithm
ISSN:0045-7825
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Shrnutí:A plastic damage model with the non-orthogonal flow rule is developed, which is consisted of the damage part driven by plastic strain and the plastic part based on effective stress. In the damage characterization, the degeneration law of elastic stiffness is described by the damage variable in the form of exponential function. In the plastic characterization, the evolution for plastic strain increment (PSI) is characterized from the magnitude and direction perspective. The direction of PSI is obtained directly by the fractional gradient of yield surface and the need for the construction of plastic potential function is bypassed. The magnitude of PSI is calculated based on the effective hardening function and the yield function, where the effective hardening function corresponding to the undamaged material is derived by both the normal hardening/softening function corresponding to the damaged material and the damage variable. The Next Increment Corrects Error (NICE) algorithm integrating the computational accuracy and efficiency is used for the numerical implementation of model. The ability of model to capture the complex mechanical behavior of concrete is assessed by the monotonous and cyclic test data from the literature. •Plastic flow direction is determined based on the non-orthogonal flow rule.•Effective hardening function is obtained by normal hardening and damage behavior.•Permanent deformation and stiffness degradation behavior of concrete is captured.•Numerical implement of model integrates computational accuracy and efficiency.
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ISSN:0045-7825
DOI:10.1016/j.cma.2019.112716