<p>The fretting fatigue simulation that considers the grain size involves multi-scale calculation problems from macro-scale (mm level) to meso-scale (μm level) and hundreds of cycles of loading. Limited by the current computer hardware computing and storage capacity, conventional methods can only calculate the meso-scale fretting fatigue problems of hard materials with limited size specimens and limited contact half-width, which greatly limits the crystal plasticity finite element method Promotion and application. In order to overcome the limitations of traditional methods on calculating model size and material properties, this paper proposes a micro-scale fretting fatigue simulation method based on sub-model technology. Firstly, a coarse-grid global model and a sub-model of local area refinement are established for the sample, and the global model is cut along the boundary of the sub-model. Secondly, using the pad on the upper part of the sample, perform fretting fatigue analysis on the macroscopic global model of the sample under the action of cyclic shear load, and save the displacement analysis results of each step of the sub-model boundary position. Third, define the boundary of the sub-model, and set the driven variables in each analysis step as displacement variables; the contact characteristics and loading methods of the sub-model and the upper pad are consistent with the global model. Then, the displacement driving variables obtained from the fretting fatigue calculation of the global model are applied as boundary conditions on the boundary of the sub-model, and the fretting fatigue analysis of the meso-submodel is performed. Finally, compare the analysis results of the global model and the sub-model near the boundary of the sub-model to verify the effectiveness of the sub-model settings. In this paper, a fretting fatigue calculation example is used to illustrate the crystal plasticity finite element simulation method based on the sub-model technology. The calculation results show that the global model stress cloud map at the left and right boundary of the sub-model is consistent with the sub-model stress cloud map in terms of magnitude and distribution. In addition, the stress distribution curve at the bottom boundary of the sub-model coincides with the stress distribution curve of the global model at that part. In addition, the use of sub-model technology greatly reduces the size of a single output file, and overcomes the limitation of boundary conditions on the calculation model size and material properties, making it possible to implement large-size, softer material models refined crystal plastic finite element microscopy in personal workstations. Dynamic fatigue simulation becomes a reality. It can be seen that the sub-model analysis method proposed in this paper is reasonable and effective to analyze micro-scale fretting fatigue.</p>

Micro-Scale Fretting Fatigue Simulation Method Based on Submodelling Technique

Paper Proceedings: https://asmedigitalcollection.asme.org/IMECE/IMECE2021/volume/85543

ASME 2021 International Mechanical Engineering Congress and Exposition (IMECE2021)

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