温度对金属-复合材料混合多螺栓连接力学性能的影响  

Effect of temperature on mechanical properties of metal-compositehybrid multi-bolt joint

作　　者：王东 董传瑞 朱红民[1] 丁国元 黄河源[2,3] 赵美英 WANG Dong;DONG Chuanrui;ZHU Hongmin;DING Guoyuan;HUANG Heyuan;ZHAO Meiying(China Academy of Launch Vehicle Technology,Beijing 100076,China;School of Aeronautics,Northwestern Polytechnical University,Xi'an 710072,China;National Key Laboratory of Strength andStructural Integrity,Xi'an 710065,China)

机构地区：[1]中国运载火箭技术研究院,北京100076 [2]西北工业大学航空学院,西安710072 [3]强度与结构完整性全国重点实验室,西安710065

出　　处：《复合材料学报》2024年第6期3248-3257,共10页Acta Materiae Compositae Sinica

基　　金：强度与结构完整性全国重点实验室开放基金(ASSIKFJJ202305005)。

摘　　要：以铝合金-碳纤维/双马来酰亚胺(BMI)树脂复合材料多螺栓双搭接结构为研究对象,结合数字图像相关(DIC)技术开展了不同温度环境下(-100℃、25℃、150℃)的准静态拉伸试验,并采用金属弹塑性模型和复合材料渐进损伤模型进行数值模拟分析,同时开发考虑温度影响的UMAT子程序预测复合材料损伤,研究了温度对金属-复合材料混合多螺栓连接结构承载能力、破坏模式、损伤演化和钉载分配的影响规律。结果表明:相比25℃室温环境,150℃和-100℃环境下结构的极限载荷分别降低4.46%和2.06%;不同温度环境下的破坏模式均为复合材料孔边拉伸断裂,同时高温环境下孔边分层与挤压现象更为严重,而低温环境下纤维与基体结合紧密,孔边挤压与分层现象更弱;150℃环境下复合材料孔边损伤不均匀性相比常温环境有所减弱,而-100℃环境下不均匀性有所增强;由于热膨胀不匹配性,高温和低温环境下3组螺栓钉载分配规律也表现出明显差异。Taking the aluminum alloy-carbon fiber/bismaleimide(BMI)resin composite multi-bolt double-lap structure as the research object,combined with digital image correlation(DIC)technology,quasi-static tensile tests under different temperature environments(−100℃,25℃,150℃)were carried out.The elastic-plastic model of metal and the progressive damage model of composite were used for numerical simulation.A UMAT subroutine considering the influence of temperature was developed to predict the damage of composite materials.The influence of temperature on load-bearing capacity,failure mode,damage evolution and bolt-load distribution of metal-composite hybrid multi-bolt joint structure was studied.The results show that the maximum load of the structure in the environment of 150℃and−100℃is reduced by 4.46%and 2.06%compared with the room temperature environment of 25℃,respectively.The failure modes of three temperature environments are all tensile fracture of the hole edge of the composite.The delamination and extrusion phenomenon of the hole edge are more serious at the high temperature,but the fiber and the matrix are tightly bonded and the extrusion and delamination of the hole edge are weaker in the cryogenic temperature environment.The unevenness of the multi-bolt hole edge damage is weakened at 150℃and enhanced at−100℃,compared with at the room temperature.Due to the difference in thermal expansion between metal and composite,the bolt load distribution of the three bolts at high and cryogenic temperatures is different.

关 键 词：碳纤维/BMI树脂复合材料 螺栓连接结构 渐进损伤分析 高/低温力学性能 钉载分配 

分 类 号：V214.8[航空宇航科学与技术—航空宇航推进理论与工程] TB333[一般工业技术—材料科学与工程]