用云纹干涉法研究静止裂纹尖端附近的奇异性

Study on Singularity Around the Statical Crack-tip Using Moire Interferometry

用高灵敏度云纹干涉法的差载与夹层技术对平面应力状态下幂硬化材料双边切口受拉试件进行了试验，在不同载荷下得到了裂纹尖端附近的位移、应变和应力场。试验结果表明随着载荷增加裂纹尖端附近的试验结果与局部理论解在变化规律上的一致性，证实了在其主导区内分别被Ｋ场、Ｊ场奇异解控制着；同时还得到了主导区尺寸ＲＫ， ＲＪ。

Specimens of power-hardening materials with double- edgenotchs are tested under tensile plane stress state by using differentialload and sandwich technique of high-sensitivity moire interferometry.Displacement, strain and stress field around the crack-tip are obtained under different loads. Experiment shows that, with the increase of load, the experimental results and the partially theoretical solution are the two in change-law shows that in good agreement so long as their variation laws are concerned. The experimental results indicate that k-singularity field and J-singularity field dominate respectively in their zone of dominance. Size RK, RJ of their zones of dominance are also obtained.