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若已知球罐内表面裂纹深度,应力幅度,角变形,错口量,Paris公式中系数C与m等的分布规律,用Paris公式导出的疲劳寿命公式为概率模型,则可用统计试验法计算疲劳寿命的分布规律。从而算出球罐寿命小于规定服役期的概率,也就得到球罐疲劳安全可靠性。 根据参数敏感性分析就可得到上述控制疲劳失效许多因素对疲劳失效影响的程度。 引用国内文献介绍的数据,已编制了计算程序。进行了实例计算。
If you know the inner surface of the spherical tank crack depth, stress amplitude, angular deformation, the wrong port volume, Paris formula coefficient C and m distribution, etc., using Paris formula derived fatigue life formula for the probability model, you can use the statistical test method Fatigue life distribution. Thus calculate the life of the tank less than the probability of the provisions of the service period, also get the ball tank fatigue safety and reliability. According to the parameter sensitivity analysis, the degree of the above-mentioned factors controlling the fatigue failure can be obtained. Citing the data presented in the domestic literature, a calculation program has been prepared. An example calculation was made.