Abstract
Multiaxial high cycle fatigue analyses concern many mechanical components in several industries (aircraft, automobile, railway...). Many multiaxial fatigue criteria have been proposed in the literature for metals. This study deals with the integration of fatigue criteria in finite element code by using APDL (ANSYS Parametric Design Language) scripting language. Three criteria have been implemented including Crossland, Dang Van and Vu et al. [6] criteria. The predictions of Vu et al. criterion are in good accordance with the experimental data.
Highlights
Mechanical components in service are usually subjected to multiaxial complex loading and their required lifetimes are often in the range of high cycle fatigue (106 – 109 cycles)
Dang Van proposed a combination of local shear stress W t and the hydrostatic stress V H t that looks for the maximal value in all grain orientations and in variable time
Vu et al [6] proposed a multiaxial criterion for high cycle fatigue based on invariants of macroscopic stress tensor
Summary
Mechanical components in service are usually subjected to multiaxial complex loading and their required lifetimes are often in the range of high cycle fatigue (106 – 109 cycles). In order to determine the stress level allowable for the safety of the component, many multiaxial fatigue endurance criteria have been proposed in the literature for metals [1,2]. For application with real structure, the multiaxial fatigue criteria need to be implemented with finite element codes [3]. Obvious advantages of this approach: benefit the material properties data, 3D design of structure, meshing, setup of load and boundary conditions, stress analysis by finite element method and result post-processing. Only limited softwares integrate the multiaxial fatigue criteria such as nCode (integration of Dang Van criterion), Samcef (integration of Crossland criterion)
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