scholarly journals An energetic formulation of a gradient damage model for concrete and its numerical implementation

2018 ◽  
Vol 155 ◽  
pp. 160-184 ◽  
Author(s):  
Mariela Luege ◽  
Antonio Orlando ◽  
Martin E. Almenar ◽  
Elvio A. Pilotta
Keyword(s):  
Damage Model ◽  
Numerical Implementation ◽  
Energetic Formulation

scholarly journals A Coupled Elastoplastic Damage Model for Clayey Rock and Its Numerical Implementation and Validation

Geofluids ◽  
2020 ◽  
Vol 2020 ◽  
pp. 1-14 ◽  
Author(s):  
Shanpo Jia ◽  
Zhenyun Zhao ◽  
Guojun Wu ◽  
Bisheng Wu ◽  
Caoxuan Wen
Keyword(s):  
Damage Model ◽  
Clayey Rock ◽  
Triaxial Tests ◽  
Numerical Implementation ◽  
Integration Algorithm ◽  
Stress Criterion ◽  
Proposed Model ◽  
Maximal Tensile Stress ◽  
Nonlinear Hardening ◽  
Elastoplastic Damage

This paper presents a new constitutive model for describing the strain-hardening and strain-softening behaviors of clayey rock. As the conventional Mohr-Coulomb (CMC) criterion has its limitation in the tensile shear region, a modified Mohr-Coulomb (MMC) criterion is proposed for clayey rock by considering the maximal tensile stress criterion. Based on the results of triaxial tests, a coupled elastoplastic damage (EPD) model, in which the elastic and plastic damage laws are introduced to describe the nonlinear hardening and softening behaviors, respectively, is developed so as to fully describe the mechanical behavior of clayey rock. Starting from the implicit Euler integration algorithm, the stress-strain constitutive relationships and their numerical formulations are deduced for finite element implementation in the commercial package ABAQUS where a user-defined material subroutine (UMAT) is provided for clayey rock. Finally, the proposed model is used to simulate the triaxial tests and the results validate the proposed model and numerical implementation.

scholarly journals Numerical Implementation of Spatial Elastoplastic Damage Model of Concrete in the Framework of Isogeometric Analysis Approach

2016 ◽  
Vol 2016 ◽  
pp. 1-13
Author(s):  
Cheng Ma ◽  
Wei-zhen Chen ◽  
Jian-yuan Sun
Keyword(s):  
Isogeometric Analysis ◽  
Geometric Modeling ◽  
Damage Model ◽  
Internal Variables ◽  
Flow Rule ◽  
Equilibrium Path ◽  
Numerical Implementation ◽  
Mapping Algorithm ◽  
Solution Algorithms ◽  
Elastoplastic Damage

This paper is a study of the numerical implementation of the spatial elastoplastic damage model of concrete by isogeometric analysis (IGA) method from three perspectives: the geometric modeling and the numerical formulation via IGA method, the constitutive model of concrete, and the solution algorithms for the local and global problems. The plasticity of concrete is considered on the basis of a nonassociated flow rule, where a three-parameter Barcelona yield surface and a modified Drucker-Prager plastic potential are used. The damage evolution of concrete driven by the internal variables is expressed by a piecewise function. In the study, the return-mapping algorithm and the substepping strategy are used for stress updating, and a new dissipation-based arc-length method with constraint path that considers the combined contribution of plasticity and damage to the energy dissipation is employed to trace the equilibrium path. After comparisons between simulation results and experimental data, the use of the elastoplastic damage model in the framework of IGA approach is proven to be practical in reflecting material properties of concrete.

scholarly journals A novel visco-elastic damage model for asphalt concrete and its numerical implementation

2020 ◽  
Vol 264 ◽  
pp. 120261
Author(s):  
Peng Cao ◽  
Zhen Leng ◽  
Feiting Shi ◽  
Changjun Zhou ◽  
Zhifei Tan ◽  
...  
Keyword(s):  
Asphalt Concrete ◽  
Damage Model ◽  
Numerical Implementation ◽  
Elastic Damage

Development and Numerical Implementation of an Anisotropic Continuum Damage Model for Concrete

2016 ◽  
Vol 713 ◽  
pp. 115-118
Author(s):  
Juha Hartikainen ◽  
Kari Kolari ◽  
Reijo Kouhia
Keyword(s):  
Basic Characteristic ◽  
Damage Model ◽  
Failure Surface ◽  
Anisotropic Damage ◽  
Continuum Damage ◽  
Numerical Implementation ◽  
Dissipation Potential ◽  
Characteristic Behaviour ◽  
Gibb’S Free Energy ◽  
Realistic Shape

In this paper, a thermodynamic formulation for modelling anisotropic damage of elastic-brittle materials based on Ottosen's 4-parameter failure surface is proposed. The model is developed by using proper expressions for Gibb's free energy and the complementary form of the dissipation potential. The formulation predicts the basic characteristic behaviour of concrete well and results ina realistic shape for the damage surface.

Sign in / Sign up

Export Citation Format

Share Document