A mechanical proprties and fatigue life of aluminum alloy sheets for autobodies

J. Ocean Eng. Technol. 1997;11(2):57-69.

자동차 차체용 알루미늄 합금 판재의 기계적특성과 부식피로수명

박인덕,윤옥남,남기우

부경대학교 대학원,㈜유니슨산업,부경대학교 재료공학과

Keywords: Plastic strain ratio, Work hardening exponent, Mechanical properties, Fatigue, Spot Weld Joint, Fatigue Life, Corrosion solution

핵심용어: 소성변형율비, 가공경화지수, 기계적성질, 피로, 스폿용접부, 피로수명, 부식액

Abstract

The objetive of this study is to compare the mechanical proprties of 6000 series Al-Mg-Si aluminum alloy (AC120) with 5000 series Al-Mg aluminum alloy (TG25), and to investigate the influence of corrosion solution for fatigue life. Comparing of TG25 and AC120 alloy sheets, TG25 alloy sheets showing higher plastic ratio and total elongation have better formability than AC120 alloy sheets. The hardness of nugget area was a little higher than that of base metal area. Also, grain coarsening was observed in HAZ(Heat Affected Zone). In a corrosion fatigue experiment, the fatigue life decreased as concentration increased, when a dipping time was constant. The life decreased as dippling time increased, when a concentration was constant.