包含细微缺陷的碳纤维增强复合材料管件结构弯曲性能表征  

Characterization of Flexural Properties of Carbon Fiber Rein-forcedComposite Tubes Containing Tiny Defects

作　　者：杨增钦 陈柏淼 尚福林[2] 侯德门[2] 马小飞[3] 王辉[3] YANG Zengqin;CHEN Bomiao;SHANG Fulin;HOU Demen;MA Xiaofei;WANG Hui(Nanjing Research Institute of Electronics Technology,Nanjing 210039,China;School of Aerospace,Xi’an Jiaotong University,Xi’an 710049,China;Xi’an Institute of Space Radio Technology,Xi’an 710100,China)

机构地区：[1]南京电子技术研究所,南京210039 [2]西安交通大学航天航空学院,西安710049 [3]西安空间无线电技术研究所,西安710100

出　　处：《空间电子技术》2020年第1期58-70,共13页Space Electronic Technology

基　　金：国家自然科学基金(编号:11672220);国家自然科学NSAF联合基金(编号:U1537213)。

摘　　要：碳纤维增强树脂基(CFRP)复合材料管件结构力学性能受其内部细微缺陷的影响。对前期经历过恒温蠕变(25℃、60℃、100℃)和温度循环蠕变试验(-60℃~100℃)的CFRP管件,开展准静态弯曲加载测试和微观观测研究,分析细观缺陷对管件弯曲性能的影响。在此基础上,对CFRP管件中的基体微裂纹和微孔洞开展理论建模,建立包含特定微裂纹密度和孔隙率的复合材料层合结构本构关系。以基体裂纹和平面圆形孔洞为例,分析了两种细观缺陷对材料刚度性能的影响,与文献中的实验结果对比表明,上述损伤模型能够预测由于微裂纹和微孔洞引起的材料刚度性能下降。进而以微裂纹密度和孔隙率为内变量,建立兼顾微观损伤响应和宏观性能表征的CFRP管件力学性能分析模型,运用有限元方法计算CFRP管件弯曲模量和弯曲强度,结果表明,该模型能够有效预测CFRP管件由蠕变损伤导致的弯曲性能变化。The mechanical properties of the carbon fiber reinforced polymer(CFRP)composite tube were affected by its internal micro-defects.The three-point bending tests and micro-analysis of the CFRP tubes that have undergone constant temperature at 25℃,60℃,100℃and thermal cycles between-60℃and 100℃creep tests were conducted,the effect of the micro-defects on the flexural properties was analyzed.Based on these,a theoretical mechanics model of composite containing matrix micro-cracks and micro-voids was established.The constitutive relationship of composite materials containing micro-cracks density and porosity was developed.As matrix cracks and plane circular voids for example,the influences of two micro-defects on the stiffness properties of composite were analyzed.It was verified by comparing with the experimental results in the literature that,the damage model is capable to predict the reduction of the stiffness properties results from the micro-cracks and micro-voids.Furthermore,using the micro-cracks density and porosity as internal variables,a mechanics model was proposed for CFRP tubes to consider micro-defects and macro-properties.The flexural modulus and strength of CFRP tubes were calculated through FEM.The results show that the attenuated flexural properties caused by the creep damage of the CFRP tubes can be predicted reasonably by this model.

关 键 词：CFRP管件 细微缺陷 弯曲性能 损伤力学模型 损伤变量 

分 类 号：TB330.1[一般工业技术—材料科学与工程]