Transactions of the Korean Society of Mechanical Engineers A (대한기계학회논문집A)

The Korean Society of Mechanical Engineers (대한기계학회)
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A study on the through crack behavior of aluminum alloy with cantilever beam type under variable load

외팔보 형식의 하중진폭 변화에 대한 Al 합금의 관통균열 거동에 관한 연구

  • Yoo, Heonil (School of Mechanical & Automotive engineering, Kookmin University) ;
  • Kim, Yeob-Rae (Graduate School of Kookmin University)
  • 유헌일 (국민대학교 기계 · 자동차공학부) ;
  • 김엽래 (국민대학교 대학원)
  • Published : 1998.04.01
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Abstract

This paper examines the crack growth behavior of 7075-T651 and 5052-H32 aluminum alloy under high-low block loading condition. The cantilever beam type specimen with a chevron notch is used in this study. The crack growth and closure ae investigated by compliance method. The applied stress ratios are R=0.15, 0.0, -0.15 and R=-0.15, 0.0, 0.15. The crack growth rate was found to increase as the load amplitude increases. However,${\bigtriangleup}K_eff$ was almost independent on the stress ratio. The experimental constants of 7075-T651 and 5052-H32 in Paris law were c`=1-1.3${\times}{10^-7},m`=3~3.2 and c`=4~6{\times}{10^-9}, m`=4.3-4.8$, respectively. $K_op$ of 7075-T651 and 5052-H32 becomes smaller as the stress ratio decreases. It seems that the crack closure affects $K_op$.

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