Computational Simulation of the Damage Accumulation Processes in Cracked Solids by the User Procedure Umat of Simulia Abaqus

Abstract

The paper presents the experience of using the user subroutine UMAT for FEM package SIMULIA Abaqus/CAE for damage accumulation processes in the vicinity of the crack. A continuum damage mechanics model based on the constitutive relations of linear elastic isotropic materials with the incorporated damage tensor components is used to describe the material behavior. The material nonlinearity arising from the deformation process is modelled by introducing an anisotropic damage tensor of the second rank into the constitutive equation. The material model is described by means of user procedure UMAT of SIMULIA Abaqus. The finite element (FE) mechanical constitutive model is implemented in Abaqus/Standard via a UMAT routine. Numerical experiments for a large series of cracked specimens have been performed. Computed stress and damage tensor components were found. It is shown that they are not dependent on the FE mesh refinement. Distributions of the damage tensor components in the vicinity of the crack tip in cracked specimens of different configurations under mixed mode loading in a wide range of mixed mode loadings are found. The configurations of active damage accumulation process zone in the cracked specimens are obtained. It is shown that the damage accumulation process has a substantial influence on the stress-strain state in the vicinity of the crack tip and leads to a decrease of the stress concentration in cracked specimens.

Influence of artificial notch length in composite material on damage indicator values

“…The use of coefficient (7) and relation (6) gives the initial estimate of the desired level of remote stress σ C 0 = 23.0 MPa. Again, as in the previous case, a certain margin is introduced in the direction of fringes density decreasing.…”

“…When damages are accumulated, in most cases there is a deterioration in the performance of the structural material due to deformation processes and microstructural changes. The damage accumulation process is usually described by the damage indicator used as a variable in the kinetic equation, which characterizes the damage accumulation rate [3][4][5][6]. As such parameter a macroscopic value is used, which numerically expresses the change in damage in the studied area of the structural material.…”

Влияние Длины Искусственного Надреза В Композиционном Материале На Величины Индикаторов Повреждаемости

“…При накоплении повреждений, в большинстве случаев, происходит ухудшение эксплуатационных свойств материала конструкции вследствие деформационных процессов и микроструктурных изменений. Для описания процесса накопления повреждений обычно служит индикатор повреждаемости, используемый в качестве переменной в кинетическом уравнении, которое характеризует скорость накопления повреждений [3][4][5][6]. В качестве такого параметра используется макроскопическая величина, численно выражающая изменение повреждаемости в исследуемой области материала конструкции.…”