真空热循环对T700/5224复合材料力学性能的影响  

EFFECT OF VACUUM THERMAL CYCLING ON MECHANICAL PROPERTIES OF T700 /5224 COMPOSITES

作　　者：陈永务 张庆利 高禹 陶文斌[1] 

机构地区：[1]中国兵器装备集团国营第5727厂研究所,江西九江332006 [2]空军驻江西地区军事代表室,江西南昌330024 [3]沈阳航空航天大学材料科学与工程学院,辽宁沈阳110136

出　　处：《玻璃钢／复合材料》2012年第3期31-37,共7页Fiber Reinforced Plastics/Composites

基　　金：国家自然科学基金(51073094)

摘　　要：为了揭示T700/5224复合材料在真空热循环作用下的力学性能演化规律,本文在10-5Pa,-140～140℃条件下,对T700/5224复合材料的质损率和力学性能进行了表征,并采用SEM分析方法对试样表面形貌、断口特征及表层化学结构进行了研究。研究结果表明,随真空热循环次数的增加,T700/5224复合材料的质损率升高,经29次真空热循环后上升幅度降低,而经157次真空热循环后趋于平缓。随着真空热循环次数的增加,T700/5224复合材料90°拉伸强度首先降低,48次热循环后开始升高,198次热循环后趋于平缓;弯曲强度在48次真空热循环前变化不明显,48次真空热循环后开始上升,95次真空热循环后开始降低,经198次真空热循环后趋于平缓;层剪强度变化不明显。In order to reveal the damage effects and mechanism of vacuum thermal cycling on carbon/epoxy composites,the changes in mass loss rate and mechanical properties of T700/5224 composites were investigated under vacuum thermal cycling at the interval of-140~140℃ and 10-5Pa.The surface morphology,fracture surface and changes in microscopic structure in the specimen skin layer were characterized by using SEM.The experimental results show that with the increase of the vacuum thermal cycles,the mass loss rate of T700/5224 composites increases.After 29 cycles,this rate shows slower increases and tends to level off after 157 cycles.Mass loss is due to the gradual evaporation of the water absorbed in the composites and the residue organic solvent retained during preparation in vacuum.The 90° tensile strength of the T700/5224 composites firstly decreases with increasing thermal cycles and improves after 48 cycles and then tends to level off after 198 cycles.The bending strength does not exhibit increase until after 48 cycles,then decreases after 95 cycles and level off after 198 cycles.The interlaminar shear strength does not show significant change.

关 键 词：T700/5224复合材料 真空热循环 力学性能 断口形貌 

分 类 号：TB3[一般工业技术—材料科学与工程]