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International Journal of Automotive Technology > Volume 22(3); 2021 > Article
International Journal of Automotive Technology 2021;22(3): 701-711.
doi: https://doi.org/10.1007/s12239-021-0065-8
NUMERICAL ANALYSIS OF NOTCH EFFECT ON FATIGUE BEHAVIOR OF SHORT FIBER REINFORCED PLASTICS USING MULTI-SCALE MATERIAL MODELING
Young Man Kim, Yong Hwan Kim
Chungnam National University
PDF Links Corresponding Author.  Young Man Kim , Email. yonghkim@cnu.ac.kr
ABSTRACT
In the automotive industry, short fiber reinforced plastic (SFRP) composites are important alternatives to metallic materials to improve fuel efficiency and reduce environmental problems. Vehicle components have geometrical discontinuities such as holes and weld lines subject to stress under cyclic loading. In this study, the fatigue behavior of SFRP composites was analyzed to explore the notch effect. Fiber orientation during the injection molding process was one of the major factors affecting the mechanical properties of SFRP composites. The use of Digimat with mean-field homogenization methods enabled description of the micro-structure, including fiber length and fiber orientation, and offered diverse options for modeling the linear and nonlinear SFRP materials. The fatigue notch effect of fiber reinforced polybutylene terephthalate with 30 wt% glass fiber was searched to provide references. LS-DYNA, a commercial finite element code, was used in coupled analysis with Digimat to calculate the stress amplitude of SFRP composites according to fiber orientation. The stress results from a structural analysis were used for fatigue analysis with FEMFAT. Fatigue analysis for the SFRP composites took into account influence factors like the relative stress gradient and fiber orientation.
Key Words: SFRP composites, Fiber orientation, Coupled analysis, Fatigue notch effect, Mean-field homogenization, Digimat
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