Test set-up for the fatigue life assessment of complex lightweight structures under combined loading

该提案项目的主要目标是设计和建立一个测试装置，用于DFG-Großgeräte倡议中要求的复合载荷下复杂轻质结构的疲劳寿命评估。复合载荷包括复合的拉/压和剪切载荷，也就是说，屈曲也可以被看作是疲劳损伤的原因。组合结构的基本类型是加强板（可能是弯曲的），但也可以测试其他类型的结构。试验装置的总体目标是允许在组合恒定或可变振幅载荷下进行试验，以模拟接近真实载荷的条件，包括局部和全尺寸。为此，我们开发了一种全新的设计，能够以合理的成本获得良好的组合载荷条件。该项目的第二个目标是为需要这种试验装置的研究项目提供支持。第3节中给出了六个简短的项目描述来证明这一点。在所有情况下，新设置的重要特征是，它将使提案人能够深入了解复杂结构和相对复杂的负载的应用，这在不太复杂的测试中无法找到。这保证了实验本身和开发/研究的理论模型的结果质量的一大步。这里加入了三个积极参与此类研究的提议者，但从所描述的项目中可以明显看出，其他合作伙伴也将从中受益。

It is the main goal of the proposal project to design and build a Test Set-up for the fatigue life assessment of complex lightweight structures under combined loading as required in the DFG-Großgeräteinitiative. The combined loading consists of combined tension/compression and shear which is to say that buckling may also be seen as a cause for fatigue damage. The basic type of build-up structure is a stiffened panel (possibly curved), but it should also be possible to test other types of structures. The general goal of the test set-up is to allow for tests under combined constant or variable amplitude loading in order to simulate conditions, which are near to realistic loading, both on a local as well as on full scale. For this purpose a completely new design has been developed which allows to yield good combined loading conditions at reasonable costs.The second goal of the project is to allow research projects, which require such a test set-up. Six short project descriptions are given in section 3 to demonstrate this. In all cases the important feature of the new set-up is that it will enable the proposers to acquire insight into the application to complex structures and relatively complex loading, which can not be found in less complex tests. This promises a large step in the quality of results both in experiments itself and in the theoretical models developed/investigated. Three proposers which are heavily involved in such research are joined here, but from the described projects it becomes obvious that also other partners will benefit from them.