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根据局部热屈曲的失效机理,考虑局部温度和压应力水平两个热屈曲主要因素,从以应力函数和挠度函数为变量的受热板控制方程出发,推导出薄壁结构热屈曲失稳边界的判据表达式.依据确定的热载荷和设计的压力载荷,确定火焰筒结构的局部热屈曲危险部位,并将子模型技术引入到热屈曲分析中,确定危险部位的临界温度和临界压应力,以此对火焰筒结构进行局部热屈曲判别.通过工程实例的初步验证,计算与试验结果吻合良好,对火焰筒结构设计具有重要的工程应用价值.
According to the failure mechanism of local thermal buckling, considering the main factors of local thermal buckling and local compressive stress, considering the governing equations of thermal plate with stress function and deflection function as variables, the criterion of thermal buckling of thin-walled structure is deduced According to the expression, the local hot buckling dangerous parts of the flame tube structure are determined according to the determined thermal load and the designed pressure load, and the sub-model technique is introduced into the thermal buckling analysis to determine the critical temperature and the critical compressive stress of the dangerous part. The local thermal buckling of the structure of the flame tube is discriminated.Through the preliminary verification of the engineering example, the calculation is in good agreement with the experimental results, which has an important engineering application value for the design of the flame tube structure.