대한기계학회논문집 (Transactions of the Korean Society of Mechanical Engineers)
- 제13권3호
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- Pages.461-471
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- 1989
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- 1225-5963(pISSN)
DOI QR Code
5083-H115 알루미늄 합금의 혼합 모우드 피로 균열성장 특성
Mixed-mode fatigue crack growth behaviors in 5083-H115 aluminum alloy
초록
본 연구에서는 혼합 모우드 균열문제의 연구를 위하여 .KAPPA.
For the mixed-mode crack problems the direction of crack growth, the crack path and the rational representation of fatigue crack growth rates should be studied to predict fatigue life and safety of structures. In this study, a round specimen which produce nearly identical effects in all loading directions is proposed to make an easy measurement of initial direction of crack growth. The mode I and mode II stress intensity factors of the specimen were calculated using finite element method, in which the square root singular stresses at the crack tip are modeled by means of four rectangular quarter-point eight-noded elements surrounding the crack tip. Experimental results for high strength aluminum alloy showed that the direction of mixed-mode crack growth agree well with maximum principal stress criterion as well as minimum strain energy density criterion, but not with maximum shear stress criterion. From data of fatigue crack growth rates using crack geometry projected on the line perpendicular to the loading direction it is easily established that mixed-mode fatigue crack growth in 5083-H115 aluminum alloy goes predominantly with mode I crack growth behaviors.
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