Determination of fracture toughness of polymer coating using micro-scale digital image correlation technique利用微尺度数字图像相关技术测定聚合物涂层断裂韧度

Abstract摘要

This study develops a microscale digital-image-correlation approach to quantify the interfacial fracture toughness of polymer coatings on substrates. Interfacial stress-intensity factors are analyzed with crack-tip-opening-displacement theory and finite-element simulations. A multi-angle loading fixture and micro-DIC measurement procedure are designed to limit specimen rotation and out-of-plane motion, allowing crack-tip opening displacement to be resolved at roughly one tenth of the minimum measurable value of the conventional setup. Mixed-mode stress-intensity factors and an interfacial failure criterion are then obtained and demonstrated on nanoparticle-reinforced epoxy coatings.

本研究建立了利用微尺度数字图像相关技术定量表征聚合物涂层—基底界面断裂韧度的方法。研究结合裂纹尖端张开位移理论与有限元模拟分析界面应力强度因子，并设计多角度加载夹具和微尺度 DIC 测量流程，以限制试样转动和面外位移，使裂纹尖端张开位移的测量精度达到传统装置的约十分之一。研究进一步获得混合型应力强度因子和界面失效判据，并将该方法应用于纳米颗粒增强环氧涂层。