对设计引起的疲劳临界点单轴应力状态多轴加载安全部件的评估 Beurteilung multiaxial belasteter Sicherheitsbauteile mit uniaxialem Spannungszustand verursacht durch Geometrie in kritischen Stellen
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引用次数: 0
摘要
本研究的重点是利用单侧孔的 Al 2024 T3(AlCuMg2 T3)合金空心试样获得的结果,确定在多轴载荷作用下,是否可以在不应用任何多轴强度假设的情况下,简单地评估单轴应力状态缺口的疲劳强度。在疲劳临界位置,即内孔边缘,只有轴向加载或/和扭转产生的法向应力分量才会发生叠加。在相外加载的情况下,产生的局部单轴应力甚至低于相内加载下的应力,并导致非比例加载下的疲劳寿命延长至裂纹萌发,而这在材料本身的多轴应力/应变情况下是观察不到的。由于裂纹起始点的局部应力状态是单轴的,因此在裂纹起始点(l=0.2 毫米)的失效标准中无需应用多轴强度假设。此外,考虑到高应力、与材料体积相关的支撑因素,非均质应力分布的好处也得到了强调,它允许局部应力高于无缺口试样的沃勒线给出的水平。
Assessment of multiaxially loaded safety components with uniaxial stress state in fatigue critical sites caused by design
Beurteilung multiaxial belasteter Sicherheitsbauteile mit uniaxialem Spannungszustand verursacht durch Geometrie in kritischen Stellen
The focus of this study, using results obtained with hollow specimens of the alloy Al 2024 T3 (AlCuMg2 T3) with a one-sided bore, was to determine if, under multiaxial loading, the fatigue strength in a notch with a uniaxial stress state can simply be assessed without the application of any multiaxial strength hypothesis. In the fatigue critical location, the bore edge, only a superimposition of normal stress components, resulting from axial loading or/and torsion, occurs. In the case of out-of-phase loading, the resulting local uniaxial stress is even lower than the stress under in-phase loading and leads to an increase of fatigue life to crack initiation under the non-proportional loading, which is not observed in the case of multiaxial stressing/straining of the material itself. As the local stress state in the crack initiation site is uniaxial, the application of a multiaxial strength hypothesis, for the failure criterion of crack initiation (l=0.2 mm), is not necessary. Furthermore, the benefit of non-homogenous stress distributions, which allow locally higher stresses than the levels given by the Woehler-line for unnotched specimens, was underlined by considering highly-stressed, material-volume-related support factors.
期刊介绍:
Materialwissenschaft und Werkstofftechnik provides fundamental and practical information for those concerned with materials development, manufacture, and testing.
Both technical and economic aspects are taken into consideration in order to facilitate choice of the material that best suits the purpose at hand. Review articles summarize new developments and offer fresh insight into the various aspects of the discipline.
Recent results regarding material selection, use and testing are described in original articles, which also deal with failure treatment and investigation. Abstracts of new publications from other journals as well as lectures presented at meetings and reports about forthcoming events round off the journal.