Abstract
The paper deals with a numerical model to investigate the influence of stress state on damage and failure in the ductile steel X5CrNi18-10. The numerical analysis is based on an anisotropic continuum damage model taking into account yield and damage criteria as well as evolution equations for plastic and damage strain rate tensors. Results of numerical simulations of biaxial experiments with the X0- and the H-specimen presented. In the experiments, formation of strain fields are monitored by digital image correlation which can be compared with numerically predicted ones to validate the numerical model. Based on the numerical analysis the strain and stress quantities in selected parts of the specimens are predicted. Analysis of damage strain variables enables prediction of fracture lines observed in the tests. Stress measures are used to explain different stress-state-dependent damage and failure mechanisms on the micro-level visualized on fracture surfaces by scanning electron microscopy.
Highlights
During the last years the use of high quality ductile metals has been remarkably increased due to demands and requirements of the customers
In the paper a numerical model has been discussed to investigate the influence of stress state on damage and failure in the ductile steel X5CrNi18-10
The numerical analysis is based on a thermodynamically consistent anisotropic continuum damage model taking into account yield and damage criteria as well as evolution equations for plastic and damage strain rate tensors
Summary
During the last years the use of high quality ductile metals has been remarkably increased due to demands and requirements of the customers. Various research groups performed during the last decades experiments with different specimens taken from thin metal sheets and corresponding numerical simulations to investigate stress-state-dependent material behavior. Further aspects to design geometries of biaxially loaded specimens have been discussed [10,15,21] to study stress-state-dependent damage and failure mechanisms. Numerical studies on the micro-level with three-dimensionally loaded void-containing unit cells have been performed to detect stress-state-dependent damage and fracture mechanisms caused by formation of individual micro-defects and their interactions [6,12,13,16,17,25,34]. Evolution of strain and stress measures in critical regions of the specimen are computed where damage and fracture are expected to occur They are used to predict damage processes and fracture mechanisms on both the micro- and the macro-level
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