【作者】 高禹； 杨德庄； 何世禹； 何松； 刘勇； 吕刚；

【Author】 Gao Yu, Yang Dezhuang, He Shiyu, He Song, Liu Yong, Lv Gang Space Materials and Environment Engineering Lab, Harbin Institute of Technology, Harbin 150001

【机构】 哈尔滨工业大学空间材料与环境工程实验室；

【摘要】 对单向M40J/5228A复合材料进行了真空热循环试验(93～413K,10^-5Pa),分别测试了经不同次数真空热循环后材料的90°和0°拉伸强度、弯曲强度和层剪强度,并通过扫描电镜对试样断口进行了观察。试验结果表明,随真空热循环次数的增加,90°和0°拉伸强度下降,并分别于48次和40次真空热循环后趋于平缓。弯曲强度随真空热循环次数增加表现出先上升后下降再趋于平缓的特征,而层剪强度变化不大。90°和0°拉伸强度的变化与界面脱粘程度密切相关。弯曲强度变化主要反映真空热循环时树脂基体后续固化效应的影响。层剪强度变化是界面脱粘与树脂基体后续固化两种因素综合作用的结果。更多还原

【Abstract】 The vacuum thermo-cycling(93～413K, 10^-5Pa)was performed on unidirectional M40J/5228A composites, and the 90° and 0° tensile strengths, the bend strength and the interlayer strength were examined after vacuum thermo-cycling for various cycles. The fracture surfaces of the specimens were observed by SEM. Experimental results show that with increasing the thermal cycles, both the 90° and 0° tensile strengths decrease and tend to level off after the cycles of 48 and 40, respectively. The bend strength shows a trend of ascending followed by descending and leveling off, while the interlayer strength do not change a lot. The changes in the 90° and 0° tensile strengths could be related to the interface debonding. The thermo-cycling would cause on additional curing of the epoxy matrix and affect the bent strength. The change in the interlayer strength depends on the combination of the interface debonding and the followed curing caused by the vacuum thermo-cycling.更多还原