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Fretting Fatigue Behavior of High Strength Aluminum Alloys

고강도 알루미늄 합금의 프레팅 피로거동

  • 최성종 (경일대학교 기계자동차학과) ;
  • 이학선 (영남대학교 대학원) ;
  • 이철재 (한국항공우주산업주식회사) ;
  • 김상태 (영남대학교 기계공학부)
  • Published : 2007.02.01

Abstract

Fretting is a contact damage process that occurs between two contact surfaces. Fretting fatigue reduces fatigue strength of the material due to low amplitude oscillatory sliding and changes in the contact surfaces of strongly connected machine and structure such as bolt, key, pin, fixed rivet and connected shaft, which have relative slip of repeatedly extreme low frequency amplitude. In this research, the fretting fatigue behavior of 2024-T3511 and 7050-T7451 aluminum alloys used mainly in aircraft and automobile industry were experimentally estimated. Based on this experimental wort the following results were obtained: (1) A significant decrease of fatigue lift was observed in the fretting fatigue compared to the plain fatigue. The fatigue limit of 2024-T3511 aluminum alloy decreased about 59% while 7050-T7451 aluminum alloy decreased about 75%. (2) In 7050-T7451 specimen using ATSI4030 contact pad, crack was initiated more early stage than using 2024-T3511 contact pad. (3) In all specimens, oblique cracks were initiated at contact edge. (4) Tire tracks and rubbed scars were observed in the oblique crack region of fracture surface.

Keywords

Fretting;Fretting Fatigue;Contact Pressure;Fatigue Limit;Oblique Crack;Tire Track

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