基于中心复合设计的金属-塑料连接强度分析

Analysis of Bonding Strength of Metal-plastic Adhesion Based on Central Composite Design

首先通过中心复合设计方法完成金属-塑料连接试验方案的设计,再使用光纤激光器对金属表面进行处理,然后以平板硫化机完成金属-塑料热压连接成型,最后采用万能试验机进行轴向拉伸试验获得金属-塑料连接强度.在此基础上,基于多元非线性理论,建立了激光功率Pc、扫描线宽d和扫描速度v与连接强度之间的多元非线性回归模型.采用逐步回归的迭代策略,分析各工艺参数以及各工艺参数交互作用对金属-塑料连接强度的影响程度,并进行金属-塑料连接试验、轴向拉伸试验.研究结果表明:该多元非线性回归模型具有很好的拟合度,决定系数R2=0.996;Pc是对金属-塑料连接强度影响最大的主效应,Pc与d是影响金属-塑料连接强度的交互效应;当Pc=35 W,d=0.01 mm,v=300mm·s^-1时,金属-塑料连接强度最大;试验结果与回归分析结果相吻合,证明该预测模型可靠.相关的理论和方法可为塑料在汽车上的应用提供参考.

Through the central composite design method, an experimental program of metal-plastic adhesion is completed. A fiber laser was used to treat the metal surface, and metal-plastic hot-pressing adhesion was formed by the flat vulcanizing machine. Finally, the tensile strength of the metal-plastic adhesion was obtained by a universal testing machine. Based on the multivariate nonlinear theory, a multivariate nonlinear regression model between laser power Pc, scanning line width d, scanning speed v, and the bonding strength was established. The effect and interaction of process parameters on the bonding strength of metal-plastic adhesion were analyzed using the iteration strategy of step wise regression. The analysis results show that the multivariate nonlinear regression model has a good fitting degree;R2 is 0.996. It can be concluded that laser power Pc has the main effect on the strength of metal-plastic adhesion, and laser power Pc and scanning line width d are the interaction effects on the strength of metal-plastic adhesion. The results of the experiment and regression analysis show that the metal-plastic bonding strength is the highest when the laser power Pc is 35 W, the scanning line width d is 0.01 mm, and the scanning speed v is 300 mm·s^-1. With this parameter, the metal-plastic adhesion test was completed, and an axial tensile test was subsequently carried out. The results show that the test results are consistent with the regression analysis results, which proves the reliability of the prediction model. The related theories and methods can provide reference for the application of plastics in automotive engineering.