Geometrically exact integral-based nonlocal model of ductile damage: Numerical treatment and validation

Результат исследования: Материалы конференцийматериалырецензирование

Аннотация

The applicability of a previously proposed finite strain model of nonlocal damage is analyzed. The model kinematics is based on the multiplicative decomposition of the deformation gradient into three parts: porosity-induced dilatation, elastic strain, and plastic strain. The nonlocality is introduced by integral-based averaging operator, applied to the so-called continuity parameter, which is dual to porosity. Withing the advocated modelling framework, basic principles like objectivity and thermodynamic consistency are satisfied. Using a home-made FEM code, we compare simulation results with actual experimental data regarding crack initiation and propagation. The underlying problem of destruction of a plate with a hole is considered, naturally involving large inelastic deformations prior to strain localization. The plate's material is Russian structural steel 20. A quantitative comparison is carried out in terms of force-displacement curves. Experimentally measured strain distributions and crack growth are used for a qualitative validation of the nonlocal model.

Язык оригиналаанглийский
СостояниеОпубликовано - 2021
Событие16th International Conference on Computational Plasticity: Fundamentals and Applications, COMPLAS 2021 - Barcelona, Испания
Продолжительность: 7 сент. 202110 сент. 2021

Конференция

Конференция16th International Conference on Computational Plasticity: Fundamentals and Applications, COMPLAS 2021
Страна/TерриторияИспания
ГородBarcelona
Период07.09.202110.09.2021

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