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PROPAGATION OF SHORT FATIGUE CRACKS IN STEEL 16Mn

WANG Weiming HUANG Yuhua XU Hao Northeast University of Technology.Shenyang , China Doctorate student , Post Box 175 , Northeast University of Technology , Shenyang 110006 , China

金属学报(英文版)

Small bar speeimens of steel 16Mn with blind-holes were fatigued under constant amplitude Ioadings on a rotathing bending fatigue machie.Short crack propagation emanating from the blind-holes was obtained.Based on the experimental results,an expression of average propa- gation rate of short cracks was proposed.Statistical behavior of short crack propagation was discussed and the evoluation of sutrface sizes of short cracks with fatigue cycle number was al- so given.

关键词: steel 16Mn , null , null , null

16Mn钢非比例循环塑性的研究

彭向和 , 高芝晖 , 马鸣图 , 颜在先

金属学报

对正火状态16Mn在二维循环复杂应变路径下的流动特性和强化进行了系统的实验研究对于特定的循环应变路径,当应变幅值较小时,材料多表现为循环弱化;随着应变幅值的增加,循环弱化的现象逐渐消失,在某些路径下甚至表现为循环强化.在非比例循环加载条件下,材料的强化与路径形状密切相关实验表明,应变的幅值和路径方向的变化所造成的强(弱)化间存在耦合。本工作在材料对非比例加载史的记忆和Lensky局部确定性假设的适用性方面也进行了研究

关键词: 16Mn钢 , nonproportional cyclic straining , plastic flow , hardening

16Mn钢疲劳短裂纹扩展

王维明 , 黄雨华 , 徐灏

金属学报

用带有盲孔的16Mn钢小圆棒试样进行等幅加载的疲劳试验,研究盲孔边短裂纹的扩展。建立了短裂纹平均扩展速率、裂纹长和名义应力幅的表达式,分析考察了短裂纹扩展的统计规律,讨论了裂纹表面尺寸分布随疲劳循环数的演化情况。

关键词: 16Mn钢 , short crack , bending fatigue , propagation rate , statistical behaviour

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