复合材料干涉连接结构多界面夹紧力有限元分析
FEM Analysis of Clamping Force at Multi-interfaces with Interference-fit for Composite Joints

建立了碳纤维增强复合材料（CFRP）的单搭接螺栓连接结构三维模型，在充分考虑材料属性及接触关系的基础上，进行了干涉配合状态下孔周应力状态和夹紧力分布的数值模拟与分析。结果表明：在预紧力沿模型板厚方向的传递过程中，螺栓与孔壁接触界面的摩擦力会直接抵消部分作用力，导致自螺母端至螺栓钉头端夹紧力逐渐降低，降低的幅度与速率受到预紧力大小和孔周应力状态的影响。
A bolted composite joint with interference-fit is conducted to analyze the stress state and the clamping force with a three-dimensional, solid finite element model. A full definition of the material properties and the contact pairs is implemented. It is shown that the transfer of the clamping load, which is created by the process of bolt tightening, will be affected by the friction significantly. Along the direction of plate thickness, the clamping force reduces from the bottom of the plate to the bolt head. The descending magnitude of clamping force is decided by the number of the bolt load and stress state in the vicinity of the fastener hole