探测复合材料层板基体裂纹的实验技术

介绍探测复合材料层板基体裂纹的三种实验技术:声波发射探测,超声波C扫描和复制带记录。在试验各阶段,应充分利用每种试验方法的优点,使每个试件比常规试验获取更多的试验数据,包括声波发射探测响应图,超声波对整个试件宽度扫描成像,以及沿着试件侧面厚度上的复制带获取图像。最初由声波发射显示试件加载期间基体裂纹的开始形成,通过超声波扫描能清晰分辨出第一条基体裂纹的出现;随着基体裂纹的发展,可综合应用三种实验技术,确定对基体断裂的评估。根据试验结果,对这三种实验技术作了评价。

EXPERIMENTAL TECHNIQUES FOR DETECTING COMPOSITE LAMINATES

Three experimental techniques for detecting matrix cracking evolution in composite laminates are investigated: acoustic emission detection, ultrasonic wave C-scan, and replica tape record. In various test stages, the advantages of each test method should be fully used so that more test data can be obtained for each specimen than those in the regular tests, including acoustic emission hit response diagram, ultrasonic wave scanning image throughout the specimen width, and replica tape picture along the edge thickness. The first acoustic emission hit corresponds to the matrix cracking initiation during loading. Through the ultrasonic scan, this first matrix crack can be clearly identified. With the development of the matrix cracking, all the techniques are combined to determine the matrix fracture evolution. Based on the test results, these techniques are evaluated.