【摘要】 本文根据反射式焦散线──伪焦散线法和弹塑性断裂力学的基本原理，推导出裂纹尖端形状方程，为测量裂纹尖端的张开位移，提供一种全新的实验方法。本文还引用实例来进行验证。更多还原

【Abstract】 In this paper,three kinds of experimental method used to measure crack-tip opening displcement by means of caustics method are analysed.A new method is proposed to deterpoine the shape’of crack tip on the basis of caustics-pseudocaustics method and elasto plastic fracture mechanics.Experimental example is also presented.更多还原