树脂基复合材料壳体固化降温过程的热力耦合分析

Thermo-mechanical coupling analysis of resin-based composite case during cooling process after cured

以树脂基复合材料壳体固化工艺过程为基础,对复合材料壳体的固化降温过程进行了热力耦合仿真计算,采用实体单元建立纤维缠绕壳体的数值分析模型,对壳体固化降温过程模型内部的温度场、轴向位移、应力进行了分析。结果表明,复合材料壳体和绝热层在固化降温过程中温度不断降低,芯模、空腔、芯轴的的温度先升高后降低,固化降温一段时间后,模型内部不同位置的温差趋于稳定;复合材料壳体在降温过程中沿轴向向外膨胀,前封头与后封头极孔处的轴向位移分别为6.5 mm和4.3 mm,芯模和芯轴沿轴向收缩,通过比对,位移仿真结果与实测数据一致性较好;复合材料壳体应力随固化降温时间的增加不断增大,筒段中部裙内缠绕层之间的层间剪应力大于裙外层间剪应力的值,裙连接段处裙外层间剪应力大于筒段中部层间剪应力的值。

Based on the curing process of resin matrix composite case,the thermo-mechanical coupling simulation calculation of composite case during cooling process after cured was carried out.The numerical analysis model of filament wound case was established by solid element.The temperature field,axial displacement and stress during the case curing cooling process were analyzed.The results show that: the temperature of composite case and thermal insulation layer decreases continuously in the process of curing and cooling.The temperature of core mold,cavity and core shaft increases first and then decreases.After curing and cooling for a period of time,the temperature difference in different positions of the model tends to be stable.During the cooling process,the composite shell expands outwards along the axial direction.The axial displacements on the pole holes of the front and back dome are 6.5 mm and 4.3 mm respectively.The mandrel and the spindle shrink along the axial direction.Through comparison,the displacement simulation results are in good agreement with the measured data.The stress of composite shell increases with the increase of curing time.The interlaminar shear stress between the inner and outer layers of the skirt in the middle section is greater than that between the outer layers of the skirt.The interlaminar shear stress between the outer layers at the skirt connection section is greater than that between the middle layers of the case.