回路J积分守恒性的测定与研究

本文从回路定义的Ｊ积分出发，采用激光全息干涉及散斑干涉法测出紧凑拉伸试件裂纹前端区域弹性情况下的应力场和位移场。采用两条不同回路的测点，计算出应力分量和形变分量，经计算得出的两个回路Ｊ积分值，相差仅为３．３３％，从而证明了Ｊ积分的守恒性。

Experimental Check of Conservation of Loop J-integration

According to the formula of J-integration arround a loop, laser holographic interferometry and sickle interferometry are used to measure the stress and strain fields of the crack tip region of a compact tension specimen under the condition of linear elasticity. The stress components and strain components are talculated. The discrepocies between two groupe dais taken from different loop measuring points are less than 3. 33%,thereby the conservation of loop J-intearetion is testified.