구멍 뚫기 방법을 이용한 균일한 응력장에서의 잔류응력 측정

Abstract

Residual stress might not only cause structural failure in materials, but also have a significant influence on the safety and life of the object as it superposes with the load applied to machine components or structures. In this paper, the effect of the residual stress analysis procedure and relaxation coefficients was investigated for the practical application of the residual stress measurement method by hole-drilling method, and the reliability of this method was evaluated. To this end, a tensile test was performed to generate a known uniaxial stress field, and the relaxation strain was measured by drilling, and the residual stress was analyzed and compared. Under the conditions of the tensile test, the given longitudinal stress was 49.0 MPa and the transverse stress was 0, while the measured principal stresses were 40.0 MPa and -2.72 MPa. Considering that the general residual stress measurement method has an error of about 20-50%, it is shown that the residual stress measurement results obtained in this paper are reliable.