The paper deals with the gradient based shape optimization of the biaxial X0-specimen, which has been introduced and examined in various papers, under producibility restrictions and the related experimental verification. The original, engineering based design of the X0-specimen has been applied successfully to different loading conditions persisting the question if relevant stress states could be reached by optimizing the geometry. Specimens with the initial as well as with the two load case dependent optimized geometries have been fabricated of the aluminum alloy sheets (AlSi1MgMn; EN AW 6082-T6) and tested. The strain fields in critical regions of the specimens have been recorded by digital image correlation technique. In addition, scanning electron microscope analysis of the fracture surfaces clearly indicate the stress state dependent damage processes. Consequently, the presented gradient based optimization technique facilitated significant improvements to study the damage and fracture processes in a more purposeful way.

中文翻译：

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X0 试样的形状优化：理论、数值模拟和实验验证

该论文涉及基于梯度的双轴 X0 试样形状优化，在可生产性限制和相关实验验证下，已在多篇论文中介绍和检验。X0 试样的原始、基于工程的设计已成功应用于不同的加载条件，这仍然存在一个问题，即是否可以通过优化几何形状来达到相关的应力状态。具有初始和两个依赖于载荷工况的优化几何形状的试样已由铝合金板 (AlSi1MgMn; EN AW 6082-T6) 制成并经过测试。用数字图像相关技术记录了试样关键区域的应变场。此外，断裂表面的扫描电子显微镜分析清楚地表明了应力状态相关的损伤过程。因此，所提出的基于梯度的优化技术促进了以更有目的的方式研究损伤和断裂过程的显着改进。