热力联合作用下热塑性复合材料悬臂梁的弹塑性分析  

Elastic-plastic Analysis of Thermoplastic Composite Cantilever Beams Under Combined Thermodynamic Action

作　　者：唐雨 雷勇军[1,2] 吴栋 于宝石 张大鹏 TANG Yu;LEI Yongjun;WU Dong;YU Baoshi;ZHANG Dapeng(College of Aerospace Science and Engineering,National University of Defence Technology,Changsha 410073;Hunan Key Laboratory of Intelligent Planning and Simulation for Aerospace Missions,Changsha 410073)

机构地区：[1]国防科技大学空天科学学院,长沙410073 [2]空天任务智能规划与仿真湖南省重点实验室,长沙410073

出　　处：《纤维复合材料》2023年第3期3-12,共10页Fiber Composites

基　　金：国防科技大学自主创新科学基金项目“可重复使用碳纤维增强热塑性复合材料力学特性与失效机理研究”(22-ZZCX-077)。

摘　　要：纤维增强热塑性复合材料由于基体韧性的增大导致其弹塑性特性突出,而考虑温度影响后其力学行为则更为复杂。考虑非线性热载荷与弯矩联合作用的影响,基于Timoshenko梁和塑性线性强化理论,建立了针对纤维增强热塑性复合材料悬臂直梁弹塑性问题的理论分析模型,得到了悬臂直梁应力和位移的解析解,并将解析解分别与文献和有限元的计算结果进行对比,验证了所建理论分析模型的正确性。在此基础上,分析了不同弯矩、纤维铺层角和跨高比对悬臂直梁弹塑性行为的影响。相关结论可为纤维增强热塑性复合材料的设计和工程应用提供参考。The elastoplastic properties of fiber-reinforced thermoplastic composites are prominent due to the increase of matrix toughness,but the mechanical behaviors of fiber-reinforced thermoplastic composites are more complicated considering the influence of temperature.Considering the combined effects of nonlinear thermal loads and bending moments,a theoretical analysis model for the elastoplastic problem of a cantilever straight beam reinforced with fiber reinforced thermoplastic composites is established based on Timoshenko beam and the theory of plastic linear strengthening.The analytical solutions of the stress and displacement of the cantilever straight beam are obtained,and the analytical solutions are compared with the calculated results in literature and finite element respectively.The correctness of the theoretical analysis model is verified.On this basis,the effects of different bending moments,fiber ply Angle and span height ratio on the elastic-plastic behavior of the cantilever beam are analyzed.These conclusions can provide reference for the design and engineering application of fiber reinforced thermoplastic composites.

关 键 词：热塑性复合材料 热力联合 弹塑性 悬臂直梁 本构模型 

分 类 号：TB33[一般工业技术—材料科学与工程] V214.8[航空宇航科学与技术—航空宇航推进理论与工程] V414.8