大厚度树脂基复合材料的热风箱加热固化研究

Study on curing of thick resin matrix composites in hot air chamber

中文关键词: 通航飞机复合材料  热风箱  流场  温度场  热应力

英文关键词: General aviation airplane composite  Hot air chamber  Flow field  Temperature field  Thermal stress

中文摘要:

      为研究某通航飞机典型树脂基复合材料热风箱加热固化过程中的热应力，建立了包括流固耦合、树脂固化放热的多物理场动量、热量输运模型和热应力模型，并通过实验验证了计算模型和方法的正确性。数值计算了不同厚度的层合板热风箱加热固化过程中的热空气流场，温度场以及层合板热应力场，并与热补仪加热固化过程中的对应参数进行对比。数值计算结果表明：热风箱在层合板周围能形成较高且稳定的温度环境，随着厚度的增大，层合板内温度分布更加均匀，层合板内部的热应力降低，且在固化过程中的热应力波动幅度减小。研究结果还表明，热风箱加热固化的板内热应力值在整个固化过程中均明显低于热补仪加热固化的热应力值，在升温阶段低幅达6%，在降温阶段低幅达10%。对于本文所研究的大厚度树脂基复合材料，热风箱加热固化具有较明显的优势。

英文摘要:

      In order to investigate the thermal stress during curing of a typical resin matrix composite with hot air chamber used in repairing general aviation airplane, the multi-physics field model of momentum and heat transport were developed and verified experimentally, which includes fluid-solid coupling, exothermic heat of resin curing, and the thermal stress model. The hot air flow field, temperature field as well as thermal stress field of the laminated plates with different thickness during curing process in hot air chamber were numerically calculated and compared. And the curing effects were also compared with those during the heat curing process with the heat-blanket. The numerical calculations show that a high and stable temperature environment around the laminated plate can be formed in the hot air chamber, and the temperature distribution within the laminated plate is more uniform with increasing thickness, and the thermal stress as well as it’s magnitude of change inside the laminated plate are reduced with increasing thickness. The results also show that the value of the thermal stress within the plate cured by hot air chamber heating is significantly smaller than that cured by heat-blanket heating during the whole curing process. The difference is up to 6% in the heating stage and 10% in the cooling stage. Hot air chamber heat curing has obvious advantages for the large thickness resin matrix composites investigated in this paper.