固化变形致复合材料搭接结构装配间隙对其连接强度的影响研究

Research on the Influence of Assembly Gap on the Connection Strength of Composite Overlap Structures Caused by Curing Deformation

摘要:

固化变形会引起装配间隙，从而对复合材料搭接结构连接强度造成影响。为研究固化变形引起的装配间隙对复合材料搭接结构连接强度的影响，提出热力耦合前处理法，针对于复合材料单搭接结构，建立含孔层合板模型进行热—力耦合分析，得到含固化变形的带孔层合板模型，并在该模型的基础上建立含装配间隙的复合材料单搭接结构模型，进行拉伸试验的数值模拟，得到复合材料单搭接结构的拉伸强度，并与不含固化变形的复合材料单搭接结构的拉伸强度进行对比，分析固化变形对复合材料机械连接强度的影响。结果表明：使用本文提出的热力耦合前处理法进行强度预测，结构拉伸极限强度减少约3.2%。

Abstract:

The assembly structure of aircraft has a large number of components, large dimensions, high precision requirements, and complex coordination processes. The solidification deformation of composite materials greatly affects the forming accuracy of structural components, resulting in assembly gaps during subsequent assembly processes, leading to significant assembly stresses and even inability to assemble properly, thereby affecting the overall structural strength and aerodynamic efficiency of the aircraft. This article proposes a "thermal coupling pre-treatment method" to study the effect of assembly gaps caused by solidification deformation on the connection strength of composite lap structures. For composite single lap structures, a porous laminated plate model is established for thermal mechanical coupling analysis, and a porous laminated plate model with solidification deformation is obtained. Based on this model, a composite single lap structure model with assembly gaps is established, and numerical simulation of tensile tests is carried out to obtain the tensile strength of composite single lap structures. The tensile strength of composite single lap structures is compared with that of composite single lap structures without solidification deformation, and the influence of solidification deformation on the mechanical connection strength of composite materials is analyzed.