用数字图像相关法研究改性高分子材料的断裂行为

Studies on Fracture Behaviors of the Modified High Polymer by Using Digital Image Correlation Method

对数字图像相关测量方法进行了系统的研究，对相关迭代算法中的初值估计问题进行了分析研究，提出利用“实时相减”和“精密调节”相结合的办法来获得零初值，从而有效地解决了 Ｎｅｗｔｏｎ － Ｒａｐｈｓｏｎ 迭代算法中的初值估计问题，提高了迭代的收敛速度和精度；

Digital-image correlation method(DICM) has been developed in this paper.The initial estimates of both displacement and displacements gradients for Newton-Raphson iteration are studied.The new method of initial estimates,a real time image subtraction scheme and a micro-motion compensation mechanism being used to take zero as initial estimates,is firstly presented and demonstrated.Some problems in the initial estimates and the convergence of Newton-Raphson iteration have been solved.The fracture behavior of PE composites are studied by using DICM.