模具形式对V型结构复合材料固化变形的影响

Effect of Mold Formig Method on Curing Deformation of V-Shaped Composites

复合材料在热压罐成型过程中由于发生不可避免的物理化学变化,将会发生固化回弹变形导致尺寸偏差。V型结构普遍用于飞机外表面,研究模具形式对V型结构复合材料固化变形的影响,可有效保证复合材料成型精度,减少装配难度。本文通过建立有限元分析模型以及设计典型结构试验件相结合的方式,分析模具形式对V型结构复合材料固化变形的影响。结果表明:变形预测与试验结果误差在5%内,V型复合材料阳模成型比阴模成型的变形要大10%～15%,其变形回弹量趋势与拐角角度、制件厚度成反比,阳模成型时其回弹与拐角半径成正比。

Composites will have curing spring back deformation resulting in dimensional changes due to unavoidable physical and chemical mechanisms which take place during the autoclave curing process. V-shaped composites are widely used in the outer surface of the aircrafe, therefore it is essential to study the deformation mechanisms of the curing process for improving composites molding precision and effectively reducing the difficulty of assembly. This paper establishes the finite element analysis model and design the typical structure sample in order to analyse the influence of mold forming method on the curing deformation of V-shaped composites. The results show that the deformation between the predicition and the sample is in the range of 5%, and the deformation of the male mold forming is 10% 15% larger than that of the female mold forming. The deformation springback is inversely proportional to the corner angle and the thickness of the workpiece, when the male mold forming and its spring back angle is proportional to the radius of the coener.