In-Situ X-ray Laminography with Bi-axial Loads for the Multiscale Investigation of Damage Formation in Materials for Transportation

在寻求更轻的材料和用于运输的优化薄壁部件时，了解金属板材的特征延性损伤机理是关键。对于与应用高度相关的随加载路径变化的双轴加载，应变-损伤相互作用尚不清楚。因此，我们的建议旨在对在这种载荷下进行材料测试时平板试件内部的微结构进行三维(3D)成像。为此，我们扩展了原位同步加速器层析成像的能力，以克服其他3D技术对这类样品的固有不足。它应该发展成为一种独特的多尺度方法，从几百微米到纳米尺度来确定延性损伤的形核和生长动力学。这种分层的3D数据将作为微观模拟以及适用于预测与工程相关的力学特性的连续介质损伤模型的公式和验证的有价值的输入。

In the pursuit of lighter materials and optimized thin-walled components for transportation, knowledge about the characteristic ductile damage mechanisms in metal sheets is key. For the highly application-relevant bi-axial loading with load path changes, the strain-damage interaction is not understood. Thus, our proposal aims at three-dimensional (3D) imaging of the microstructure inside flat sheet specimens evolving during material testing under such loads. For this, we extend the capability of in situ synchrotron laminography to overcome inherent insufficience of other 3D techniques for such kind of samples. It shall be developed into a unique multiscale approach from a few hundred micrometers down to nanometer scale to determine the ductile damage nucleation and growth kinetics. Such hierarchical 3D data will serve as valuable input for microscopic simulations and the formulation and validation of continuum damage models suited to predict engineering-relevant mechanical properties.