International Journal of Aerospace and Lightweight Structures

doi: 10.3850/S201042861200030X

Study on Stress Intensity Factor of Fatigue Crack in Round Bar Under Rotary Bending

Maigefeireti Maitireyimu¹, Hiroko Kitano² and Masanori Kikuchi^{3 1}Post Doctoral Fellow of Tsinghua University, Beijing, China. mahpiret@gmail.com ²Graduation School of Tokyo University of Science, 2641 Yamazaki, Noda, Chiba, 278-8510 Japan. kitano@me.noda.tus.ac.jp ³Tokyo University of Science, 2641 Yamazaki, Noda, Chiba, 278-8510 Japan. kik@rs.noda.tus.ac.jp

ABSTRACT

Study on stress intensity factors of surface cracks in round bars under rotary bending is conducted. Superposition FEM is utilized for numerical analysis and virtual crack closure method is used for stress intensity factor (SIF) calculation. Based on case studies on cracks with different aspect ratios and crack depths, an evaluation method is developed for any rotation angle. And then simulation on single crack has been performed automatically. Results are presented and compared with cyclic loading condition. SIF evaluation method is then extended for two coplanar cracks.

Keywords: Fatigue crack, Rotary bending, Stress intensity factor, Surface crack.

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