Experimental Study on the Bending Creep Behavior of CFRP Tube
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摘要:
为评价航天器结构中碳纤维增强树脂基（CFRP）复合材料管件的使用可靠性，开展了三点弯曲加载条件下CFRP管件弯曲性能和蠕变行为试验研究。进行了管件弯曲模量和弯曲强度测试、500 h时长的恒温蠕变测试以及-60 ℃～100 ℃和-160 ℃～80 ℃两种高低温循环蠕变测试，获得了典型温度工况、不同应力水平作用下管件弯曲蠕变变形规律。根据测试结果，确定了基于时间-温度-应力等效原理的管件蠕变主曲线以及唯象蠕变Findley模型，预测分析了管件长期蠕变变形；采用最大应变强度准则，对该CFRP管件的强度特性和安全承载能力进行了评价。结果表明，该CFRP管件在设计服役期限内能够满足蠕变变形与强度要求。
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关键词:
- CFRP管件 /
- 弯曲强度 /
- 蠕变特性 /
- 时间-温度-应力等效原理 /
- 承载能力评定
Abstract:To evaluate the service reliability of Carbon Fiber Reinforced Plastic (CFRP) composite tubes used in spacecraft structure,static three-point-bending and creep tests of the CFRP tube are performed. At first,experimental tests of bending modulus and bending rupture strength,500-hour-long constant temperature creep,-60 ℃～100 ℃ and -160 ℃～80 ℃ thermal cyclic creep are conducted for the tube respectively. Based on the testing results,long-term creep deformation of the tube is predicted,using the time-temperature-stress superposition principle,the derived creep master curves as well as a phenomenal Findley model. Then,assessment on the mechanical strength and load-carrying capacity of the CFRP tube is made according to a maximum strain criterion. Results show that the CFRP tube can meet the creep deformation and strength requirements under the long-term service lifetime.
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