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本文探讨了有关起落架结构损伤容限设计的强度设计逻辑程序。给出了损伤容限要求,疲劳使用载荷谱及环境腐蚀影响的疲劳分散系数,以及依据表面裂纹长度估算深度公式。探讨了用由裂纹扩展速率积分而得的S-N曲线按Miner理论进行结构断裂分析方法。给出了用裂纹扩展增量描述的疲劳损伤,以及按裂纹扩展损伤等效原则的试验应力谱折算公式。
This article explores the strength design logic program for damage tolerance design of landing gear structures. The fatigue scatter coefficient of damage tolerance, fatigue load spectrum and environmental corrosion are given, and the depth formula is estimated based on the surface crack length. The method of structural fracture analysis based on Miner theory is discussed by using the S-N curve obtained by integrating the crack growth rate. The fatigue damage described by the increment of crack propagation and the formula of experimental stress spectrum based on the equivalent principle of crack propagation are given.