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在对称加载条件下,复合材料呈现的裂纹非共线扩展是断裂力学领域重要的研究课题之一。由于裂纹尖端附近应力和应变梯度极大,目前尚无理想的测量手段对其进行研究。利用平面云纹的实时、直观、可获得全场信息、测量范围灵活等优点可以显示并记录复合材料裂端邻域的平面应变场。
Under symmetrical loading, the non-collinear propagation of the crack presented by the composite is one of the important research topics in the field of fracture mechanics. Due to the extreme stress and strain gradient near the crack tip, there is no ideal measurement method to study it. The planar strain field in the crack tip of the composite can be displayed and recorded by using the real-time and intuitive planar moiré, the full information available and the flexible measuring range.