基于矩独立法的异质叠层复合材料铆接工艺参数灵敏度分析研究

Sensitivity of Riveting Parameters of Heterogeneous Laminated Composites Based on Moment Independence Method

为解决碳纤维增强复合材料(Carbon fber reinforced polymer,CFRP)与金属材料叠层构件铆接工艺复杂化的问题,提出了一种基于矩独立方法的叠层复合材料铆接工艺参数灵敏度分析的方法。首先,以CFRP与铝合金(Al)异质叠层材料结构为研究对象,采用有限元方法建立了CFRP/Al叠层结构的铆接仿真分析模型,并通过试验验证了仿真分析模型的正确性。其次,以铆接干涉量为目标,建立了基于随机森林方法的铆接工艺参数代理模型;随后通过代理模型进行数据扩展,以17项铆接工艺参数为输入变量,铆接干涉量为输出变量,采用基于矩独立的PAWN方法进行全局灵敏度分析,并给出了基于该方法的灵敏度系数。在铆接工艺参数对铆接干涉量的全局灵敏度系数中,异质叠层复合材料的弹性模量和厚度的灵敏度系数较大,分别为0.16921和0.11837,其次是系数为0.012的位移载荷和0.011的铆钉直径。其余工艺参数的灵敏度系数较小,一些对铆接干涉量影响很不显著的参数的灵敏度系数接近0。

In order to solve the problem that the riveting process of carbon fiber reinforced polymer(CFRP)and metal material laminated components is more complicated than that of a single material,a method for sensitivity analysis of the riveting process parameters of laminated composites based on the method of moment-independent PAWN is proposed.Firstly,taking CFRP and aluminum alloy(Al)heterogeneous laminated composite structure as the research object,the simulation and analysis model of riveting CFRP/Al laminated structure is established by using the fnite element method,and the correctness of the simulation and analysis model is verifed by experiments.Secondly,a proxy model of riveting process parameters based on the random forest method is established with the riveting interference amount as the target;furthermore,data extension is carried out through the proxy model,and a global sensitivity analysis based on the moment-independent PAWN method is carried out with 17 riveting process parameters as input variables and the riveting interference amount as the output variable,and the sensitivity coefficients based on this method are given.Among the global sensitivity coeffcients of riveting process parameters on riveting interference amount,the sensitivity coeffcients of elasticity modulus and thickness of the heterogeneous laminated composites are 0.16921 and 0.11837,respectively,followed by the coeffcients of 0.012 for the displacement load and 0.011 for the rivet diameter.The values of other process parameters are small,and the sensitivity coefficients of some parameters that have insignificant effects on the riveting interference amount are close to zero.