金属学报  1990, Vol. 26 Issue (1): 46-52

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一种等应力试样中的疲劳短裂纹行为

洪友士;吕永华;郑哲敏

中国科学院力学研究所;北京100080;中国科学院力学研究所;中国科学院力学研究所

SHORT FATIGUE CRACK BEHAVIOUR IN ISO-STRESS SPECIMENS

HONG Youshi;LU Yonghua;ZHENG Zhemin C. M. Cheng Institute of Mechanics; Academia Sinica; Beijing Institute of Mechanics;Academia Sinica;Beijing 100080

洪友士;吕永华;郑哲敏. 一种等应力试样中的疲劳短裂纹行为[J]. 金属学报, 1990, 26(1): 46-52.
, , . SHORT FATIGUE CRACK BEHAVIOUR IN ISO-STRESS SPECIMENS[J]. Acta Metall Sin, 1990, 26(1): 46-52.

摘要 参考文献 相关文章 Metrics 全文: PDF(1853 KB)   摘要: 设计了一种三角形试样,当施加弯曲载荷时,该试样等腰三角形段内的表面拉应力为常数。采用振动试验机对所设计的试样进行疲劳试验,以研究一种焊接金属表面疲劳短裂纹萌生和发展特征。结果表明,疲劳短裂纹起源于铁素体晶内的滑移带。随疲劳周次增加,短裂纹发展以裂纹密度不断增加为主要特征。短裂纹的汇合造成裂纹发展且裂纹路径以穿晶为主。 关键词 ： 等应力试样,  疲劳短裂纹,  焊接金属     Abstract：The fatigue tests were made on the specially designed specimens by avibration testing machine to investigate the initiation and propagation features ofshort fatigue cracks in a weld metal. The specimens were prepared of a kindof triangular shape in which the surface tensile stress is a constant. The resultsshow that the short fatigue cracks originate from the slip bands and initiate insidethe ferrite grains. The development of short fatigue cracks is marked by the grad-ual increase in crack density with fatigue cycles. The coalescence between shortcracks leads to crack propagation and the crack path is predominantly transgranular. Key words： iso-stress specimen    short fatigue crack    weld metal 收稿日期: 1990-01-18      服务 把本文推荐给朋友 加入引用管理器 E-mail Alert RSS 作者相关文章 洪友士 吕永华 郑哲敏 44.8K 链接本文: https://www.ams.org.cn/CN/      或      https://www.ams.org.cn/CN/Y1990/V26/I1/46 1 Gouda V K, Staehle R W. Br Corros J, 1980; 15: 111--117 2 Timoshenko S,Gere J 著,胡人礼译.材料力学,北京:科学出版社,1978:226--232 [1] 赵永翔; 高庆 . 不锈钢管道焊缝金属疲劳短裂纹行为的实验研究Ⅱ.裂纹萌生、扩展与交互作用[J]. 金属学报, 2000, 36(9): 937-943 . [2] 崔振旗;徐可为;胡奈赛. 残余压应力场中疲劳短裂纹扩展模型及实验[J]. 金属学报, 1994, 30(2): 65-69. [3] 陈铮. 8090Al-Li合金疲劳短裂纹门槛值的研究[J]. 金属学报, 1990, 26(5): 62-65. [4] 裴鸿勋;杨京俊;柯伟. 海洋用结构钢在NaCl溶液中疲劳短裂纹的扩展[J]. 金属学报, 1988, 24(6): 471-475. Viewed Full text Abstract Cited   Shared      Discussed