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用有限元法改进热应力计算本文描写用有限元法决定结构元件中热应力的方法。方法中避免了计算必须有确切尺寸情况下进行。由于受热结构一般对空间分布温度变化的灵敏度差,所以可使用有效应力计算法,并从大网格有限元解得到应变。于是同细网格温度分布应力—应变—温度状态方程联用便得到细网格结果。这方法的有效性已在计算H3T航天机的垂直尾翼受模拟再入地球环境的热应力中得到验证。
Finite element method to improve thermal stress calculation This paper describes the use of finite element method to determine the thermal stress in the structural element. Method to avoid the calculation must be the exact size of the case. Due to the generally poor sensitivity of the heated structure to temperature changes in the spatial distribution, effective stress calculations can be used and strain can be obtained from the large-mesh finite element solution. So with the fine grid temperature distribution stress - strain - temperature equation of state will be fine mesh results. The validity of this method has been verified in the calculation of the thermal tail of the vertical tailplane of the H3T spacecraft simulated by reentry earth environment.