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按照DFG-GROUGERäTE倡议的要求，设计和建造用于复杂轻质结构在组合载荷下的疲劳寿命评估的测试装置。组合载荷由拉/压和剪切组成，也就是说，屈曲也可能是疲劳损伤的原因。组合结构的基本类型是加筋板(可能是弯曲的)，但也应该可以测试其他类型的结构。测试设置的总体目标是允许在组合恒定或可变幅度加载下进行测试，以便模拟接近真实加载的条件，无论是在局部还是在整个范围内。为此，已经开发了一种全新的设计，允许以合理的成本产生良好的组合加载条件。该项目的第二个目标是允许需要这样的测试装置的研究项目。为了说明这一点，第3节给出了六个简短的项目说明。在所有情况下，新设置的重要特征是，它将使建议者能够深入了解复杂结构和相对复杂的加载的应用，这在不太复杂的测试中是找不到的。无论是在实验本身还是在开发/研究的理论模型中，这都有望在结果质量方面迈出一大步。这里有三个大量参与此类研究的提出者，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.