复合材料壳体固化温度场测试及共固化特性

温度场是复合材料壳体多材料体系共固化的一个重要工艺控制参数。采用预先埋植热电偶方法获得1^#、2^#两种固化制度下圆筒内部温度场数据,对F-3/EP-04缠绕层与三元乙丙(EPDM)绝热层在共固化条件下的固化度与性能进行研究。结果表明:壳体内部温度存在明显的滞后性,温度-固化时间曲线呈现近似抛物线形状;缠绕层能在1^#固化制度下固化,而EPDM绝热层不能完全硫化,在提高最高固化温度及延长保温时间的2^#固化制度下,均能实现固化,并且提高共固化温度与延长保温时间对缠绕层力学承载性能无影响;两种固化制度下,EPDM绝热层温度差小,而缠绕层温度差大,提高共固化温度及延长保温时间有助于降低缠绕层温度差。

Temperature Field Testing and Co-Cured Characteristics of Composite Material Case

Temperature field is an important process index of multi-material cocuring of composite material case.Thermocouples were pre-implanted in order to acquire temperature data during the two different curing cycles,named 1^# curing cycle and 2^# curing cycle.The curing degrees and properties for F-3/EP-04 winding layers and ethylene-propylene-diene monomer(EPDM) insulation were investigated under the cocuring conditions.The results showed that the internal temperature existed obvious hysteresis phenomena,and the curves of temperature-curing time displayed parabola shape approximately.Under the 1^# curing cycle condition,the winding layers could be cured completely,but EPDM insulation could not.By contrast,the winding layers and the EPDM insulation could be cured completely with no mechanical decrease under the 2^# curing cycle condition because of the highest curing temperature increase and the holding time extension.Temperature gradient was very small for EPDM insulation,but big in the composite winding layers,which could be lowered through enhancing cocuring temperature and holding cocuring times.