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Development of Evaluation Methods for Microscopic Damage Initiation and Growth in Composite Material Systems for Simultaneous Material/Structure Optimization

开发复合材料系统中微观损伤萌生和生长的评估方法，以同时优化材料/结构

基本信息

批准号：
06555291
负责人：
TAKEDA Nobuo
金额：
$ 6.59万
依托单位：
The Univiersity of Tokyo
依托单位国家：
日本
项目类别：
Grant-in-Aid for Developmental Scientific Research (B)
财政年份：
1994
资助国家：
日本
起止时间：
1994 至 1995
项目状态：
已结题

项目摘要

Microscopic damage initiation and growth procedure is the most important information for optimum design of damage-tolerant composite material systems as well as composite srucural members. In the present study, in-situ microscopic evaluation methods were developed in order to experimentally characterize the microscopic damege evolution in carbon fiber reinforced high-temperature polymer matrix composite laminates under loading. Three types of in-situ measurement techniques were used : in-situ optical microscope (OM), in-situ scanning electron microscoped (SEM) and in-situ scanning acoustic microscopes (SAM). Cross-ply laminates were selected for quantitative measurements of (1) initiation of transverse cracks in 90-degree laminas, (2) multiple transverse crack evolution, and (3) delamination from the tips of transverse cracks. Based upon the above observation, several theoretical models were proposed to explain the microscopic damage evolution in CFRP laminates.[1] High-temperature epoxy (TGDDM/DDS), toughened or modified TGDDM/DDS,and interleaved prepregs were used for experiments to study the effects of toughened interleaves on delamination suppression.[2] In-situ OM,SEM,and SAM were sucessfully used for damage evolution measurements in CFRP laminates. Each method provided complementary information.[3] Micro-line or micro-grid methods were sucessfully developed for in-situ SEM observation of interlaminar deformation and damage evolution.[4] Damage evolution under fatigue loading was quantified and compared with that under monotonic loading. Theoretical models were established based upon the qualitative imcroscopic measurements.

微观损伤萌生和生长过程是优化设计耐损伤复合材料系统以及复合材料结构构件的最重要信息。在本研究中，开发了原位微观评估方法，以便通过实验表征碳纤维增强高温聚合物基复合材料层压板在负载下的微观损伤演变。使用三种类型的原位测量技术：原位光学显微镜（OM）、原位扫描电子显微镜（SEM）和原位扫描声学显微镜（SAM）。选择交叉层合板进行定量测量：(1) 90 度薄板中横向裂纹的萌生，(2) 多重横向裂纹的演变，以及 (3) 从横向裂纹尖端的分层。基于上述观察，提出了几种理论模型来解释CFRP层合板的微观损伤演化。[1]采用高温环氧树脂（TGDDM/DDS）、增韧或改性TGDDM/DDS以及交错预浸料进行实验，研究增韧交错层抑制分层的效果。 [2]原位 OM、SEM 和 SAM 已成功用于 CFRP 层压板的损伤演化测量。每种方法都提供了补充信息。[3]成功开发了用于层间变形和损伤演化的原位SEM观察的微线或微网格方法。 [4]对疲劳载荷下的损伤演化进行了量化，并与单调载荷下的损伤演化进行了比较。理论模型是根据定性微观测量建立的。