High-frequency fatigue testing system

采用高频疲劳试验系统，大大增加了多特蒙德大学机械工程学院在甚高周疲劳状态下进行材料和构件循环试验的可能性。这种系统扩展允许表征金属和塑料在各种应力比和温度下的VHCF状态下的最大力为50 kN。高频疲劳测试系统将用于正在进行的和计划中的研究项目以及实验性学生工作和实验实验室，以调查高和非常高循环次数下的疲劳行为。由于平面和圆形试样以及复杂部件样试样（例如，增材制造的细胞结构或混合层压板）夹紧的可变性，它将使循环变形和损伤机制的载荷和循环依赖的确定成为可能，因此（首先）为这些材料和结构在VHCF制度下提供全面的设计参数。此外，生产过程的影响，例如，通过检查加工技术研究所（ISF）制造的部件，可以调查其VHCF特性，以便将其反馈给生产工程研究所，以进一步开发工艺。重点在于更好地理解工艺-结构-性能关系，从而实现性能优化的组件生产，这些组件在运行期间加载在VHCF系统中。

With the high-frequency fatigue testing system, the possibilities of cyclic material and component testing in the Faculty of Mechanical Engineering of the TU Dortmund University in the very high cycle fatigue (VHCF) regime are significantly extended. This systemic expansion allows characterizing metals and plastics in the VHCF regime up to a maximum force of 50 kN under various stress ratios and temperatures. The high-frequency fatigue testing system will be used in ongoing and planned research projects as well as in experimental student works and experimental laboratories to investigate fatigue behaviour at high and very high number of cycles. Due to the variability in the clamping of flat and round specimens as well as complex component-like specimens, e.g., additively manufactured cellular structures or hybrid laminates, it will enable the load- and cycle-dependent determination of cyclic deformation and damage mechanisms and thus (first) to provide comprehensive design parameters for these materials and structures in the VHCF regime. In addition, the influence of production processes, e.g., by examining components, manufactured at the Institute of Machining Technology (ISF), can be investigated with regard to their VHCF properties for feedback them to institutes of production engineering for the further development of processes. The focus lies on a better understanding of the process-structure-property relationships, which enable a property-optimized production of components, which are loaded in the VHCF regime during operation.