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采用数值模拟方法研究带防热层缠绕成型复合材料锥壳热固化变形的形成机理和影响因素.建立了带防热层复合材料锥壳热固化变形预测的三维有限元程序.计算结果表明:外层防热材料和内层结构材料热膨胀系数不匹配是引起壳体固化变形的主要原因.提出在内层和外层之间增加中间过渡层的方法控制壳体的固化变形,中间层材料为丁腈橡胶片时可使固化变形减小20%以上.采用数值模拟方法讨论了中间层模量、厚度以及缠绕张力对壳体固化变形的影响,分析结果表明:固化变形随中间层模量的增加而增加,随中间层厚度的增加略有减小;缠绕张力释放增加壳体的固化变形,缠绕张力越大引起的固化变形越大.
The formation mechanism and influential factors of thermosetting deformation of composite conical shell with heat-resistant layer were investigated by numerical simulation.The three-dimensional finite element program of thermosetting deformation prediction of conical shell with heat-resistant layer was established.The calculation results show that: Layer thermal insulation material and the inner structure of the material thermal expansion coefficient mismatch is caused by the main cause of curing deformation of the shell.It is proposed to increase the intermediate layer between the inner and outer layer of the shell to control the curing deformation method, When the nitrile rubber sheet is used, the curing deformation can be reduced by more than 20% .The influences of the modulus, thickness and winding tension of the middle layer on the solidification deformation of the shell are discussed by numerical simulation. The results show that the curing deformation increases with the increase of the middle layer modulus And increases slightly with the increase of the thickness of the middle layer. The release of the winding tension increases the solidification deformation of the shell, and the larger the strain caused by the winding tension is.