讲座题目：Temperature Dependence on Fiber Breakage Accumulation under Tensile Loading for Unidirectional CFRP Laminates
报告人：Prof. Junji NODA
时 间：6月29日（周二）下午2:30
地 点：力学楼434会议室
主持人：方岱宁(教授)
报告内容摘要：
The temperature dependence on the tensile damage process as well as the tensile strength in unidirectional carbon fiber reinforced plastics (CFRP) laminates was investigated experimentally and numerically. The constant strain rate tensile tests for CFRP laminates were carried out at room temperature (RT) and 120oC. The damage process under tensile loading was recorded by using a digital microscope to comprehend the accumulation of fiber breakages observed with increasing strain. The fiber breakages observed under tensile loading increase strongly in the vicinity of ultimate failure load and this behavior depresses with increasing temperature. The clusters of fiber breakages formed at RT could not be observed at 120oC. These experimental results lead to the fact that the number of fiber breakages and the existence of cluster of fiber breakages were influenced by the temperature dependent stress-strain relation of matrix resin. Then, a new simulation based on finite element model considering the stress-strain relation of matrix resin was proposed. In this model, the matrix was assumed to be an elasto-plastic creep body and the Monte Carlo simulation was conducted in order to simulate the fiber breakages. As results, the damage process and strength predicted numerically by the proposed simulation agree well with experimental results. Therefore, the temperature dependent mechanism for the damage process including the generation of clusters as well as the strength were quantitatively cleared.
报告人简介：
Assistant Professor, Materials Reliability Engineering Lab., Department of Mechanical Engineering, Yamaguchi University, Tokiwadai 2-16-1, Ube 755-8611, Japan.
Education:Mar. 1999, Bachelor of Engineering, Keio University, Yokohama, Japan
Mar. 2001, Master of Engineering, Keio University, Yokohama, Japan
Sep. 2004, Doctor of Engineering, Keio University, Yokohama, Japan
Awards:Best paper authors in 2003 awarded by the Japan Society for Composite Materials