High-frequency fatigue testing system

随着高频疲劳测试系统的出现，多特蒙德大学机械工程学院在超高周疲劳(VHCF)状态下进行循环材料和部件测试的可能性大大增加。这种系统的扩展允许在不同的应力比和温度下，在VHCF状态下对金属和塑料进行表征，最大力可达50kN。高频疲劳测试系统将用于正在进行和计划中的研究项目以及实验学生工程和实验实验室，以研究高循环和极高循环次数下的疲劳行为。由于平板和圆形试件以及复杂的类似组件的试件(如添加制造的蜂窝结构或混合层合板)的夹紧方式的多样性，它将能够确定循环变形和损伤机制的载荷和循环周期相关的确定，从而(第一)为这些材料和结构在VHCF制度下提供全面的设计参数。此外，可以针对在机械加工技术研究所(ISF)制造的部件的VHCF特性来研究生产工艺的影响，例如通过检查部件，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-性能的关系，这使得能够以性能优化的方式生产部件，这些部件在运行期间加载到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.