Abstract Notched bending specimens and axial load specimens were tested under different ultra-low cycle loadings to investigate the plastic deformation capacity and plastic energy capacity of steel members. A total of 53 experiments were performed in cyclic axial and bending configurations. The effect of notch shape, the order of mixed amplitudes, the average deformation of the amplitude, and the environmental temperature on plastic deformation capacity of steel members are studied. Four cumulative damage indices, including the ductility damage index, the normalized plastic energy damage index, the max-side ductility damage index, and the max-side normalized plastic energy damage index were compared for ductile fracture evaluation of these specimens under different ultra-low cycle loadings. The results indicated that the standard deviation of the normalized plastic energy damage index is the smallest among the four damage indices, which shows the lowest data dispersity. The max-side ductility damage index is larger than the ductility damage index, and the max-side normalized plastic energy damage index is larger than the normalized plastic energy damage index, both achieving a safety evaluation. Among the four damage indices, the max-side normalized plastic energy damage index achieves the maximum reliability.

中文翻译：

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超低周载荷作用下钢构件累积损伤指数试验研究

摘要 对缺口弯曲试样和轴向载荷试样在不同超低周载荷下进行试验，研究钢构件的塑性变形能力和塑性能能力。在循环轴向和弯曲配置中总共进行了 53 次实验。研究了缺口形状、混合振幅的顺序、振幅的平均变形和环境温度对钢构件塑性变形能力的影响。比较延性损伤指数、归一化塑性能损伤指数、最大侧延性损伤指数和最大侧归一化塑性能损伤指数四种累积损伤指数，对这些试件在不同超低温条件下的延性断裂进行评价。循环载荷。结果表明，归一化塑性能量损伤指数的标准偏差在四种损伤指数中最小，数据分散性最低。最大侧延性损伤指数大于延性损伤指数，最大侧归一化塑性能损伤指数大于归一化塑性能损伤指数，均达到安全评价。在四个损伤指数中，最大侧归一化塑性能量损伤指数达到了最大的可靠性。均达到安全评价。在四个损伤指数中，最大侧归一化塑性能量损伤指数达到了最大的可靠性。均达到安全评价。在四个损伤指数中，最大侧归一化塑性能量损伤指数达到了最大的可靠性。