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Stress Distribution and Crack Initiation Behavior due to the Defect Locations in Monolithic Aluminum and Al/Glass Fiber Laminates

단일재 알루미늄과 알루미늄/유리섬유 적층재의 결함 위치에 따른 응력분포 및 균열발생 거동

  • 송삼홍 (고려대학교 기계공학과) ;
  • 김종성 (현대자동차 남양연구소) ;
  • 오동준 (안동대학교 기계교육과) ;
  • 윤광준 (건국대학교 항공우주공학과) ;
  • 김철웅 (건국대학교 인공근육연구센터)
  • Published : 2005.02.01

Abstract

Material flaws in the from of pre-existing defects can severely affect the crack initiation. Stress distribution and crack initiation life of engineering materials such as monolithic aluminum alloy and Al/Glass fiber laminate may be different according to the defect location. The aim of this study is to evaluate effects of relative location of defects around the circular hole in monolithic aluminum and Al/Glass fiber laminates under cyclic bending moment. Stress distribution and crack initiation behavior near a circular hole are considered. Results of Finite Element (FE) model indicated the features of different stress field due to the relative defects positions. Especially, the defects positions at ${\theta}=0^{\circ}\;and\;{\theta}=30^{\circ}$ was strongly effective in stress concentration factor ($K_t$) and crack initiation behavior.

Keywords

Monolithic Aluminum;Al/Glass Fiber Laminates;Circular Hole;Defect;Stress Distribution;Crack Initiation Life;Multi-Site Damage Crack (MSD)

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