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A New Fatigue Life Calculation Method Based on Non-linear Cumulative Damage Theory

机译：一种基于非线性累积损伤理论的新疲劳寿命计算方法

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Operating characteristics of small and medium tonnage lattice boom crane which withstand fatigue loads was analyzed in this paper. It showed that the lattice boom crane utilization level is in the overlap zone of low cycle fatigue and high cycle fatigue. There may be some plastic deformation in the structure. So the total damage calculated by the Palmgren-Miner rule had a large scatter. Typical operating conditions was analyzed that K-type welded joints of the boom is under axial load and in-plane bending loads. Several critical areas of K-type welded joints were determined by ANSYS finite element calculation software where the stress amplitude was larger on the single side of the lattice boom. A new stress spectrum acquisition method based on the "measured + statistics + compare + simulation" integrated strategy of crane K-type welded joints was proposed. Based on a simplified Huffman non-linear cumulative damage theory, fatigue life of crane K-type welded Joints were calculated based on the strain parameters. They were compared with Palmgren-Miner rule and together with fracture mechanics method. Results showed that although they were all conservative compared with test results, the new method can be applied easily in for engineering applications because it only need amplitude constant amplitude fatigue strain-life data.
机译：本文分析了耐用疲劳载荷的小和中等吨位晶格臂起重机的操作特性。目前据认为，格式爆臂起重机利用水平是低循环疲劳和高循环疲劳的重叠区。结构中可能存在一些塑性变形。因此，PalmGren-Miner规则计算的总损害大散布。分析了典型的操作条件，该臂的K型焊接接头位于轴向载荷和面内弯曲载荷。 K型焊接接头的几个关键区域由ANSYS有限元计算软件确定，其中应力幅度在格子臂的单侧较大。提出了一种基于“测量+统计+比较+仿真”的起重机K型焊接接头综合策略的新的应力谱采集方法。基于简化的霍夫曼非线性累积损伤理论，基于应变参数计算起重机K型焊接接头的疲劳寿命。将它们与Palmgren-Miner规则进行比较，以及骨折力学方法。结果表明，虽然它们与测试结果相比，但它们的保守方式，但新方法可以轻松应用于工程应用，因为它只需要幅度恒定幅度疲劳应变寿命数据。

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