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通过单向拉伸测试和理论计算得到4层(45°/-45°/45°/-45°)铺设碳纤维增强复合材料(CFRP)的弹性模量,作为数值分析的材料参数.由激光测振系统测试了CFRP薄壁管空间伸展臂自振模态,得到自振频率和振型.利用ABAQUS建立了CFRP薄壁管空间伸展臂自振模态有限元模型,分别采用分层和整体材料参数分析了自振模态,得到的自振频率和振型与试验结果吻合较好,进而计算分析得到CFRP薄壁管空间伸展臂线刚度(EI/L)和刚度线密度比(EI/m)对频率的影响关系.研究结果对CFRP薄壁管空间伸展臂设计和深入研究具有重要参考价值.
The elastic modulus of four layers (45 ° / -45 ° / 45 ° / -45 °) laying carbon fiber reinforced composites (CFRP) was obtained by uniaxial tensile test and theoretical calculation as material parameters for numerical analysis. The self-vibration modes of the CFRP thin-walled tubes were tested and the natural frequencies and mode shapes of the CFRP thin-walled tubes were obtained.The natural finite element model of CFRP thin-walled tubes was established by ABAQUS, and the stratified and monolithic materials The natural vibration mode was analyzed by parametric analysis. The obtained natural frequencies and mode shapes agree well with the experimental results. Then the linear stiffness ratio (EI / L) and stiffness linear density ratio (CFR) of CFRP thin- ) On the frequency.The research results have important reference value for the design and further study of CFRP thin-walled tube’s spatial stretching arm.