Sachs' Boring Method에 의한 2024알루미늄 합금봉의 잔류응력 측정

Abstract

Sachs' Boring Method에 의하여 2024 알루미늄 합금봉의 잔류응력을 측정한 결과 Boring 면적 (A)에 대한 변형율(θ또는λ) 곡선의 기울기?에는 감소, 일정 그리고 증가하는 것등 3가지가 관찰되었다. 이 기울기는 열처리 조건에 의하여 결정되는 것으로 잔류응력이 낮은 경우 이 기울기는 일정하였다.

변형율 측정 오차는 잔류응력이 낮은 2024 합금봉의 3차원 응력해석이 불가능 할 만큼 크지는 않았다.

Three patterns of strain (θorλ) versus boring cross section (A) curves are observed on the determination fo residual quenching stresses in 2024 Alumium alloy bars by Sachs'boring Method.

The differentials ?and? of strain versus cross section curves are gradually decresing, constant or gradually increasing.

The differentials ?and? of partly relieved residual quenching stresses in 2024 Aluminum alloy bar are constant.

The error in measured strain are not so great that three dimensional analysis of partly relieved quenching stresses in 2024 Aluminum alloy bars are possible.

Three patterns of strain (θorλ) versus boring cross section (A) curves are observed on the determination fo residual quenching stresses in 2024 Alumium alloy bars by Sachs'boring Method.

The differentials ?and? of strain versus cross section curves are gradually decresing, constant or gradually increasing.

The differentials ?and? of partly relieved residual quenching stresses in 2024 Aluminum alloy bar are constant.

The error in measured strain are not so great that three dimensional analysis of partly relieved quenching stresses in 2024 Aluminum alloy bars are possible.