Prediction of damage and failure in anisotropic ductile metals: Experiments, modeling and numerical simulations

当前轻量化结构工程的发展对所用材料特别是具有各向异性的材料提出了很高的要求。因此，详细了解它们的行为是必要的，以便能够在数值上预测结构部件或复杂的创新轻量化结构的安全性。在这种情况下，系统的研究与可重复的实验涵盖所有相关的应力状态是必要的。因此，将对单轴和双轴加载的平面金属试样进行实验，以便能够检测不同的损伤和破坏机制，这取决于取向到滚动方向（各向异性）的大范围应力状态，直到最终断裂。通过相应的数值模拟，可以修正连续损伤破坏模型，对各向异性延性金属在广义加载条件下的变形破坏行为进行数值分析。本课题的主要目标是提出一种有效的连续体模型，并建立一套双轴实验和相应的试样，用于结构、航空、汽车等实用学科的安全分析和使用寿命预测中不同应力状态下的失效机制检测。

Current developments in lightweight structural engineering require high demands on used materials especially with anisotropic properties. Therefore, detailed knowledge of their behavior is necessary to be able to numerically predict the safety of structural components or complex innovative lightweight structures. In this context, systematic investigations with repeatable experiments covering all relevant stress states are necessary. Thus, experiments with flat uni- and biaxially loaded metal specimens will be performed to be able to detect different damage and failure mechanisms depending on orientation to the rolling direction (anisotropy) for a wide range of stress states up to final fracture. With corresponding numerical simulations it will be possible to modify a continuum damage and failure model to numerically analyze the deformation and failure behavior of anisotropic ductile metals under generalized loading conditions. Main goal of this research project is to propose an efficient continuum model and to establish a set of biaxial experiments and corresponding specimens used for detection of failure mechanisms for different stress states in analysis of safety and service life prediction in practical disciplines like structural and aviation engineering or car industry.