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이동석(Dongseok Lee),강종수(Jongsu Kang),유수호(Soohoo Yoo),김강욱(Kangwuk Kim) 한국자동차공학회 2004 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
The fatigue life of a structure can be enhanced by improving the mechanical and metallurgical aspects to strengthen the material around regions of high stress. Hole expansion in structures is one of the mechanical methods of strengthening material. The material for this research is A12024-T351 which is used for the mechanical structure and the primary member of aircraft. Specimens were tested under constant amplitude loading and residual stresses measured by X-ray diffraction technique. Fatigue crack initiation life was evaluated by a strain-life equation which was considered initial residual stress and residual stress relaxation exponent as a function of the strain amplitude. The predictions on fatigue crack initiation life were compared with experimental results between about O.2times and 8.6times on the whole.