可调热膨胀系数的复合材料层合结构预测与设计

Prediction and design of composite laminate with adjustablethermal expansion coefficient

本研究基于层合结构理论,提出了复合材料层合结构等效热膨胀系数预测模型。该模型既适用于对称铺设层合结构,也适用于反对称层合结构的等效热胀系数预测。同时,以碳纳米管增强复合材料层合结构为研究对象,针对反对称角铺设类型,对其等效热胀系数进行计算。计算结果显示,由于层间拉伸-弯曲-剪切耦合效应的影响,采用特定的铺设角度如(35/-35)3 T,(55/-55)3 T,碳纳米管层合结构能够在整体上呈现负热膨胀特性。这不但拓展了该类结构的服役工况,也为负热膨胀结构设计提供新的设计思路。

In the current work,based on the classical lamination theory,an analytical model of the effective thermal expasion coefficient of the composite laminate is proposed.This model is applicable to the prediction of thermal expasion coefficients of both symmetric angle-lay laminate and asymmetric laminate.Meanwhile,taking the carbon nanotube-reinforced composite(CNTRC)laminate as an example,the effective thermal expansion coefficient is predicted for the antisymmetrical lamination angle.The calculation results show that due to the influence of the layer tensile-bending-shear coupling effect,CNTRC laminate can exhibit a negative thermal expansion(NTE)by choosing specific lamination angle such as(35/-35)3 T and(55/-55)3 T.This not only expands the application of functionally graded CNTRC structures but also provides new ideas for the design of the structure with NTE.