摘要
为了探求硬聚氯乙烯(UPVC)材料复合疲劳裂纹扩展性能,获得复合裂纹力学性能等关键数据,以UPVC板材为研究对象制成三点弯试件并采用数字图像技术对其进行纯Ⅰ型和复合型准静态断裂实验分析。分析其在纯Ⅰ型、复合型裂纹稳定扩展时的CTOD,尝试用CTOD作为描述UPVC板材断裂韧性的参数。发现UPVC板材复合型的抗断裂性能优于纯Ⅰ型;在复合型加载方式下,裂纹扩展同样受Ⅰ型主导,但复合度相对增加;当裂纹达到稳定扩展时δC1值趋于稳定,因此可用CTOD作为UPVC材料裂纹稳定扩展的数值分析参数。
In order to explore the composite fatigue crack propagation properties of UPVC materials and obtain the key data of composite crack mechanical properties,a three-point bending specimen is made with UPVC plates as the research object,and the pure mode I and composite mode quasi-static fracture experimental analysis is carried out by using digital image technology.The CTOD of UPVC plate during the stable propagation of pure mode I and compound mode cracks is analyzed,and the CTOD is used as a parameter to describe the fracture toughness of UPVC plate.It is found that the fracture resistance of UPVC composite is better than that of pure type I,and under the mixed mode loading mode,the crack growth is also dominated by mode I,but the complexity is relatively increased,and when the crack reaches stable growth,δC1 value tends to be stable,so CTOD can be used as the numerical analysis parameter for the stable crack growth of UPVC material.
作者
吕婧
孙海燕
LV Jing;SUN Haiyan(School of Intelligent Manufacturing,Qingdao Huanghai University,Qingdao 266500,China)
出处
《电子质量》
2023年第3期48-52,共5页
Electronics Quality
基金
青岛黄海学院校级课题——UPVC材料动态断裂性能研究(2021KJ11)资助。
