碳纤维复合材料车体结构强度仿真分析与结构优化

Structural Strength Simulation and Optimization of Carbon Fiber Composite Car Body

利用子模型和结构优化技术相结合的方法,对碳纤维复合材料司机室的地铁车体结构进行强度研究.基于复合材料力学特点,建立地铁车车体有限元模型;在EN12663-2010标准中静态载荷作用下,对其车体结构进行静强度有限元分析,运用Tsai-Wu失效准则对碳纤维复合材料司机室进行评价,找出其薄弱部位出现在司机室骨架上,并提出改进方案;最后,以铺层厚度和角度为设计变量,以Tsai-Wu失效因子小于0.9为约束,以CFRP质量最小为目标,对司机室骨架进行结构优化,优化后Tsai-Wu失效因子为0.897,骨架减重33%.

Using the method of combining sub-model and structural optimization technology,the strength of the subway car body of carbon fiber composite cab was studied.Based on the mechanical characteristics of the composite material,the finite element model of subway car body was established.Under the static load of EN12663-2010 standard,the static strength finite element analysis of the car body structure was carried out,and the Tsai-Wu failure criterion was used to evaluate the carbon fiber composite cab.Then the weak parts of the cab frame were found out,and the improvement scheme was proposed.Finally,taking the layer thickness and angle as the design variables,taking the Tsai-Wu failure factor less than 0.9 as the constraint and the minimum CFRP mass as the goal,the structural optimization of the skeleton in the driver cab was carried out.After optimization,the Tsai-Wu failure factor is 0.897,and the skeleton weight is reduced by 33%.