Testing of Ultra-Low Cycle Fatigue at Complex Loading Scenarios
Testing of Ultra-Low Cycle Fatigue at Complex Loading Scenarios
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DOI：
10.1016/j.prostr.2017.07.201
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发表时间：
2017
期刊：
影响因子：
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通讯作者：
Sven Nagel;P. Knödel;T. Ummenhofer
中科院分区：
文献类型：
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作者：
Sven Nagel;P. Knödel;T. Ummenhofer
本文介绍了系统的调查下，ULCF多轴应力状态和可变的加载序列，因为它们发生在地震荷载下。试验是在焊接在底板上的结构钢S355的圆形空心截面（CHS）上进行的。多轴应力状态通过弯曲或扭转CHS来施加，使得每个循环的真实应变高达100%，并且应力三轴度在0和0.6之间。使用该样本和测试装置，可以测试该范围内的任意应力状态以及沿沿着不同路径的预定义载荷序列。在总共120个测试已经受到恒定和可变振幅的负载。不同的断裂模式和断裂起始的起源已经观察到。这些实验，他们的评价和文件中的文章。
This article describes systematic investigations on ULCF under multiaxial stress states and variable loading sequences as they occur under earthquake loading. The tests are performed on circular hollow sections (CHS) of structural steel S355 which are welded on baseplates. The multiaxial stress states are applied by bending respectively twisting the CHS, so that true strains up to 100 % per cycle and stress triaxialities between 0 and 0.6 occur. With this specimen and test setup arbitrary stress states in this range could be tested as well as predefined load sequences along different paths. In total 120 tests have been subjected to constant and variable amplitude loading. Different fracture modes and origins of fracture initiation have been observed. These experiments, their evaluation and documentation are presented within the article.