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COUPLED EFFECT OF TEMPERATURE AND DEGAS AND/OR MOISTURE DESORPTION ON STRENGTH OF ORGANIC COMPOSITES FOR SPACE STRUCTURAL COMPONENTS, AND DEVELOPPED RESIDUAL STRESSES

温度和脱气和/或水分解吸对空间结构部件有机复合材料强度的耦合影响以及产生的残余应力

基本信息

批准号：
12650070
负责人：
OZAWA Yoshihito
金额：
$ 2.37万
依托单位：
FUKUSHIMA UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2000
资助国家：
日本
起止时间：
2000 至 2001
项目状态：
已结题

项目摘要

In order to evaluate the strength and dimensional stability of fiber reinforced organic composites, especially carbon fiber reinforced plastics (CFRP), in the space environment, it is important to clarify the effects of temperature and vacuum condition on the mechanical behavior of CFRP and the microfractures.In this report, the tensile strength and Young's modulus of CFRP cross-ply laminates and short carbon fiber reinforced polyamide (SCFR-PI) composites are considered in the high vacuum condition 10^-4 Pa and the atmospheric condition at various temperatures. From the experimental results, the CFRP at low temperature 93K and 200K has smaller tensile strength than that at 298K in high vacuum condition. The strength of interfacial bonding between carbon fibers and the epoxy resin matrix becomes better in low temperature and high vacuum conditions. It is found that there exist the coupled effect of temperature and vacuum conditions on the tensile strength of CFRP cross-ply laminates and the microfractures.Even though tested at the same temperature 298 K, the SCFR-PI kept in high vacuum condition has higher tensile strength and equivalent Young's modulus than that in the atmospheric condition. The rule of mixture and the shear lag treatment can not be used to evaluate the strength and Young's modulus of SCFR-PI composites in high vacuum condition. The strengthening is attributed to the nonexistence of air around the specimens. In high vacuum condition, the matrix resin is shrank owing to the degas and/or moisture desorption from the matrix and from the interface between the matrix and fibers, and thus yield the residual stresses in the organic composites. The interfacial bonding strength between carbon fibers and the resin matrix becomes much better in high vacuum condition. The methods of characterizing them must be described for evaluation of SCFR-PI composites in space environment.

为了评估纤维增强有机复合材料，特别是碳纤维增强塑料（CFRP）在空间环境中的强度和尺寸稳定性，阐明温度和真空条件对CFRP力学行为和微断裂的影响是重要的。考虑了高真空条件下CFRP交叉层合板和短碳纤维增强聚酰胺（SCFR-PI）复合材料的拉伸强度和杨氏模量10^-4 Pa和不同温度下的大气条件。从实验结果来看，CFRP在低温93 K和200 K下的抗拉强度比在高真空条件下298 K下的抗拉强度小。在低温高真空条件下，碳纤维与环氧树脂基体的界面结合强度较好。结果表明，温度和真空条件对CFRP正交层板的拉伸强度和微观断裂存在耦合效应，即使在298 K的相同温度下测试，高真空条件下的SCFR-PI的拉伸强度和等效杨氏模量也高于大气条件下的SCFR-PI。在高真空条件下，混合规则和剪切滞后处理不能用来评价SCFR-PI复合材料的强度和杨氏模量。这种强化是由于试样周围不存在空气。在高真空条件下，基体树脂由于脱气和/或脱湿而发生收缩，从而在有机复合材料中产生残余应力。在高真空条件下，碳纤维与树脂基体的界面结合强度明显提高。为了评价SCFR-PI复合材料在空间环境中的性能，必须描述其表征方法。