용접 잔류응력장에서의 피로균열성장거동에 관한 연구

Abstract

본 논문에서는 알루미늄 합금 5052-H38 판재를 비구속 가스 텅스텐 아크 맞대기 용접을 한 후 압축잔류응력장으로부터 균열이 성장할 때 피로균열성장 거동에 대해 조사하였다. 압축잔류응력 영역에서 피로균열성장이 지연되었고, 이것에 대한 영향을 중첩의 원리로 잔류응력확대계수에 의하여 고찰하였다.

In this paper, fatigue crack growth behaviors of unrestrained welded aluminum alloy 5052-H38 plates were investigated when cracks were propagated in the compressive residual stress field.

In the regions of compressive residual stress was retarded fatigue crack growth rate, whose effect was analyzed in terms of residual stress intensity factor with superposition concepts.

In this paper, fatigue crack growth behaviors of unrestrained welded aluminum alloy 5052-H38 plates were investigated when cracks were propagated in the compressive residual stress field.

In the regions of compressive residual stress was retarded fatigue crack growth rate, whose effect was analyzed in terms of residual stress intensity factor with superposition concepts.