A Study on Crack Initiation of 2-Phase Composite with Through Notch

貫通노치를 가진 二相接合材의 龜裂發생에 대한 硏究

In this paper, 3-dimensional fracture phenomena in the local area near the notch tip between the surface and the center of a composite bar which is consisted of two different materials were investigated by using embedded dyeing grids with the pitch of 50.8.mu. It was confirmed that the maximum strain near the notch tip occurred not at the notch front but at the curvature beginning point of the notch which is in the interior of z/W = 0.3 - 0.35 from the surface and a notch was initiated from that point. And that the strain near the notch front between the center and z/W = 0.65 - 0.7 toward the surface was in a state of compression.

본 논문은 복합재의 3차원 파괴거동에 대한 기초 연구의 하나로, 탄성 계수가 서로 다른 물체로 구성된 2상접합재에서 군열선단의 국소영역에서의 3차원적인 파괴거동을 위의 매입격자법을 적용하여 균열선단의 3차원적인 변형율 분포상태와 노치로부터의 군열발생점 및 그 진행 방향과의 상관 관계를 살펴보았다.