基于X850预浸料体系的工型长桁层压件固化变形仿真技术研究

THE SPRINGBACK STUDY OF I SHAPE STRINGER MANUFACTURED BY X850 PREPREG

采用仿真技术对X850预浸料体系的工型长桁层压件进行了固化变形研究。仿真模型的内容主要集中在零件成型的降温过程,分析了边界条件、网格尺寸、离散方法对仿真结果的影响,确定了仿真模型中的敏感参数,在仿真结果与实际测量结果之间发生偏差的情况下,通过调整敏感参数修正仿真模型。结果表明,仿真结果会随着单元尺寸的大小以及网格离散方法的改变而改变。考虑到计算成本和仿真结果的准确性,2 mm网格及单层离散方法为最佳选择。在零件尺寸相对较小并且零件固化过程温度均匀的情况下,此仿真模型能够准确地预测零件的变形趋势,采用调整敏感参数的方法修正后的仿真模型能够较为精确地预测零件的变形量,仿真计算结果与零件实际测量的结果之间的偏差在8%以内。

The springback of I shape stringer manufactured by X850 prepreg is studied with simulation method in order to establish an accurate simulation model.Temperature falling period is the key point in the simulation model.In order to find suitable simulation model boundary condition,element size and discrete method are analyzed.Through parameter sensitivity analysis,the key parameter can be found.Then the simulation model is calibrated by adjusting the key parameter.The results show that the simulation results are different when choosing different element sizes and discrete methods.The 2 mm element size and monolayer discrete method are the best choice taking into account simulation accuracy and compute cost.The simulation model can perfect predict springback direction when the part size is small and temperature is homogeneous.Simulation accuracy can be improved by adjusting sensitive parameter.The calibrated model is verified by other projects,the difference between simulation result and measuring result is within 8%.