热压罐成型复合材料所用框架式模具热弹性耦合优化设计

Thermo-Elastic Topology Optimization of Framed Mould Used in Autoclave Processing for Composite Structures Forming

以热压罐成型复合材料所用框架式模具为研究对象,着眼于温度变化较大的热压罐成型工况,目标为降低模具型面的热变形。建立框架式模具热力耦合拓扑优化有限元模型,对模具进行变形分析,得出影响模具型面变形的主要因素;通过模具型面总变形在X、Y、Z方向变形分量的比较,结合工程实际,确定了模具设计需要重点关注型面展向变形。发展了热弹性耦合结构拓扑优化设计方法,对比各工况下的拓扑优化设计结果,得到了镂空型周期性框架式模具构型。重构模型的变形分析验证了该模型可有效降低热变形15.92%,减重21.32%,验证了该优化设计方法的有效性。

In this paper,the framed mould used in autoclave processing for composite structure forming was optimized considering thermos-elastic stress field.By adopting the finite element(FE)method,the deformation of the framed mould was obtained under thermo-mechanical loading.Through comparing the deformation of the mould surface in X,Y,Z direction from an engineering point of view,it is concluded that in the design of the framed mould one should focus on reducing the deformation inX&Ydirection.A thermos-elastic structural topology optimization method was developed to minimize the thermal defbnnation of the mould surface,leading to the optimal configuration with periodic hollow units.FE analysis of the reconstructed model shows that compared with the original design,the thermal deformation and weight of the optimized result are reduced by 15.92%and 21.32%,respectively,thus demonstrating the validity of the proposed method.