热-机载荷作用下玻/碳纤维混杂复合材料层合板的屈曲分析

Buckling analysis of glass/carbon fiber hybrid composite laminates under thermal-mechanical loading

本文以玻/碳纤维混杂复合材料(G/CFHC)层合板为研究对象,在考虑温度引起复合材料性能退化及热应力双重影响的基础上,借助有限元软件ABAQUS对G/CFHC层合板的屈曲载荷进行计算,讨论了环境温度、铺层顺序、铺层厚度、纤维混杂比对G/CFHC层合板屈曲特性的影响。结果表明:在20~120℃环境条件下,温度对G/CFHC层合板影响较大,随着温度的升高,层合板的屈曲载荷不断下降,在达到一定温度后,屈曲载荷的下降趋势趋于平缓;在铺层角度相同的前提下,屈曲载荷会随着碳纤维单层板位置的变化而发生变化,碳纤维单层板从外层逐渐向中间层移动的过程中,屈曲载荷呈降低趋势;铺层厚度对层合板的屈曲载荷影响很大,随着层合板厚度的增加,屈曲载荷呈现出持续上升的趋势。此外,纤维混杂比对G/CFHC层合板屈曲载荷有显著影响。在层合板厚度和层数一定时,增加碳纤维单层板的数量可以有效提高G/CFHC层合板的抗屈曲能力,增加其稳定性。

In this paper,glass/carbon fiber hybrid composite(G/CFHC)laminates are considered as the research object,and the buckling load of G/CFHC laminates is calculated by the finite element software ABAQUS on the basis of considering the dual influence of composite material property degradation and thermo-stress induced by temperature.The effects of ambient temperature,ply sequence,ply thickness and fiber hybrid ratio on the buckling characteristics of G/CFHC laminates are discussed.The results show that in the environment of 20~120℃,the temperature has great influence on the G/CFHC laminate.The buckling load of the laminate decreases continuously with the incresing of temperature and the downward trend tends to be flat after the temperature reaches a certain value.Under the premise of the same ply angle,the buckling load changes with the change of the position of carbon fiber laminas.The buckling load decreses gradually when the position of carbon fiber lanimas moves from the outer layers to the middle layers.And the ply thickness affects the buckling load tramatically which shows the buckling load increases with increasing the thickness of laminates.In addition,the fiber hybrid ratio has great influence on the buckling load of G/CFHC laminates.Increasing the numbers of carbon fiber laminas can improve the capability of buckling resistance of G/CFHC laminates effectively and increase the stability when the thickness and layer numbers are kept unchanged.