抄録
Quasi-static crack propagation in quenching process is investigated through experiment and theoretical analysis. Instantaneous phase-stepping photoelasticity using a CCD camera equipped with a pixelated micro-retarder array is used to measure the stress field around a crack tip in a quenched plate. The result shows that the direction of the maximum principal stress does not act in the direction of perpendicular to the crack propagation direction. The stress field for the problem is then examined by theoretically. The theoretical result agrees well with the one obtained by the experiment for the oscillating crack with small amplitude. These facts mean that the propagation direction of the crack arising in quenching process is not determined by the direction of the maximum principal stress but by that of the minimum principal stress.
