复合材料格栅结构筋条纤维形态与拉伸性能  

Fibre Distribution and Tensile Properties of Composite Grid Structure Stiffeners

作　　者：黄泽栋 王坤[1] 蔡登安[1] 周光明[1] HUANG Zedong;WANG Kun;CAI Deng’an;ZHOU Guangming(State Key Laboratory of Mechanics and Control for Aerospace Structures,Nanjing University of Aeronautics&Astronautics,Nanjing 210016,China)

机构地区：[1]南京航空航天大学航空航天结构力学及控制全国重点实验室,南京210016

出　　处：《南京航空航天大学学报》2024年第3期478-485,共8页Journal of Nanjing University of Aeronautics & Astronautics

摘　　要：复合材料格栅结构已大量应用于航空航天飞行器中,探究其力学性能具有重要的工程研究价值。为提高复合材料格栅结构的承载效率,提出一种基于“断筋”处理的纤维形态改善方法,通过有限元分析与试验验证的手段,研究了不同断筋比例对复合材料格栅结构节点处纤维形态和拉伸性能的影响。利用建立的有限元模型分析了断筋处理的复合材料格栅结构拉伸失效机理,仿真与试验结果误差均小于10%。结果表明:在成型过程中适当进行断筋处理,能够显著降低节点处纤维弯曲角度,提高拉伸性能。相较于不进行断筋处理,断筋比例为30%时,拉伸极限载荷提高了24.4%。Composite grid structures have been widely used in aerospace craft,therefore exploring their mechanical property has significant engineering research value.In order to improve the load carrying efficiency of composite gird structures,a method for improving the fiber morphology based on“broken rib reinforcement”is proposed.Through finite element analysis and test verification,the influence of different proportion of broken ribs on the fiber morphology and the tensile performance of composite grid structure ribs is studied.The established finite element model is used to analyze the tensile failure mechanism of composite grid structures treated with“broken rib reinforcement”.The error between the simulation results and the test results is less than 10%,indicating good consistency.The results indicate that proper treatment of broken ribs during the forming process of composite grid structures can significantly reduce the fiber bending angle at the joint and enhance the tensile performance.Compared with not undergoing broken rib treatment,the tensile ultimate load increases by 24.4%when the proportion of broken rib reinforcement ratios is 30%.

关 键 词：复合材料格栅结构 断筋处理 纤维形态 有限元分析 渐进损伤 

分 类 号：V46[航空宇航科学与技术—航空宇航制造工程] V258.3[一般工业技术—材料科学与工程]