A Basic Study for Influence of Temperature on Impact Damge of CFRP Laminates

温度对CFRP层合板冲击损伤影响的基础研究

基本信息

批准号：
06402029
负责人：
MATSUMOTO Hiroyuki
金额：
$ 18.43万
依托单位：
Faculty of Engineering, Tokyo Institute of Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (A)
财政年份：
1994
资助国家：
日本
起止时间：
1994 至 1996
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-06402029/
关键词：
CFRP Impact Damage Tempareture Residual Strength Delamination FOD Residual Stress Visco Elasticity 層間剥離異物衝突

项目摘要

In the present study, they influence of temperature on impact damege in carbon fiber reinforced plastic (CFRP) Iaminates was investigated experrimentally. In this three years, we aimed following items for the investigation :(1) Ovservations and evaluation of damage of the CFRP laminates subjected to impact load from forein object under several temperature conditions.(2) Measureing of the caracteristic of the thermo-viscoelastic behavior of CFRP.(3) Evaluation of the anisotropic elastic behavior of CFRP using ultrasonic microscope(4) Estimation of fracture toughness (Mode I,Mode II) under under several temperature conditions.(5) Analysis of the damage propagation of CFRP subjected to transveres load.The conclusion of these subjects are summarize as follows :(1) Dynamic impact test was carried out using air-compression gun with steel ball (phi=5mm), Delamination areas in the specimens were measured using ans ultrasonic microscope. The results revealed the total delamination areas to be p … More ropotional to the temperature, and the delamination area decreased with increasing temperature.(2) Dynamic elastic modulous E (t) was estimated with range of the tempareture from -150ﾟC to 250ﾟC.We confirmed that the elastic modulous of CFRP.(3) Amplitude-and-phase-measuring Acoustic Microscope was applied to evaluation of the elastic moduli, like Young's modulous and density, of the anisotropic body. It was confirmed that the line-forcus-lens in valid to measure the anisotropic elastic moduli.(4) In order to evaluate the arising and propagation of the delamination, Mode I and Mode II fracture toughness are measured by CNF test and ENF test under -100ﾟC-200ﾟC temp.range. It is confirmed that the fracture toughness depends on the tempereture and the caracteristic of the visco-elasticity of the specimen.(5) Finete element analysis was carried out to evaluate of CFRP fracture pattern subjected to transverse load. The mixed mode fracture pattern of the CFRP laminates consist of transverse crack and delaminations can be simulated with FEM with well conditions. Less

在本研究中，我们通过实验研究了温度对碳纤维增强塑料（CFRP）层压板冲击损伤的影响。在这三年里，我们的研究目标如下：（1）CFRP层压板损伤的观察和评估。在多种温度条件下承受外部物体的冲击载荷。(2)CFRP热粘弹性行为特征的测量。(3)各向异性弹性的评估使用超声波显微镜观察CFRP的行为（4）几种温度条件下断裂韧性（模式I，模式II）的估计。（5）CFRP在横向载荷作用下的损伤扩展分析。这些课题的结论总结如下：(1)使用带钢球的空气压缩枪(phi=5mm)进行动态冲击试验，使用超声波显微镜测量样品中的分层面积，结果显示了总分层。 (2)动态弹性模量E(t)是在-150°C到250°C的温度范围内估算的。我们证实： (3)采用测幅相位声学显微镜评价了CFRP的杨氏模量、密度等弹性模量。证实了线聚焦透镜测量各向异性弹性模量的有效性。(4)为了评估分层的产生和扩展，通过CNF测试和测量了模式I和模式II断裂韧性。 -100°C-200°C温度范围下的ENF测试证实断裂韧性取决于温度和粘弹性特性。 (5)通过精细单元分析评估CFRP层合板在横向荷载作用下的断裂模式，可以在良好的条件下用有限元模拟由横向裂纹和分层组成的混合模式断裂模式。