热沉结构管接头的应力计算与实验验证

Numerical calculation and experimental verification of stress at joint between two pipes of thermal shrouds

由于大型空间环境铝热沉设备KM6承受周期性的应力,使空间实验室结构存在安全问题,因此选择T型、L型两类典型热沉构件,运用大型计算软件PATRAN,NAS-TRAN对构件在压力谱与温度谱共同作用情况下进行应力分析,得到关键部位的应力.采用实验方法确定了热沉各连接部位的应力,并把有限元计算结果和实验结果进行比较.结果表明:有限元计算的结果与实验测量结果基本一致,从而可以采用计算方法确定空间实验室的工作应力,进行其结构的安全性预报.

The large special environmental equipment KM6 is subjected to repetitive stress. In order to assure the safely of space laboratories, two kinds types of thermal shroud structures with T and L shape were chosen and the stress analysis was carried out by use of PATRAN ＆ NASTRAN software under stress and tem- perature spectrums. The stress of critical part was determined. After that, the stress of the same parts was also obtained from experiments, and the results obtained by theoretical calculations and experiments were com- pared. The results obtained by the finite element method are approximately accordant to that obtained by ex- periment, and thus the work stress considering the effect of temperature can be determined by numerical method and then the safety of the thermal shroud structures can be predicted accordingly.