金属学报  1983, Vol. 19 Issue (3): 65-71

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裂纹顶端位错的运动和小范围屈服的K_(Ⅱc)

龙期威;高桦

中国科学院金属研究所;中国科学院力学研究所

THE DISLOCATION MOTION AT CRACK TIP AND K_(Ⅱc) OF SMALL SCALE YIELDING MATERIALS

by LONG Qiwei (LUNG Chi-wei) (Institute of Metal Research; Academia Sinica; Shenyang); GAO Hua (Institute of Mechanics; Academia Sinica; Beijing)

龙期威;高桦. 裂纹顶端位错的运动和小范围屈服的K_(Ⅱc)[J]. 金属学报, 1983, 19(3): 65-71.
, . THE DISLOCATION MOTION AT CRACK TIP AND K_(Ⅱc) OF SMALL SCALE YIELDING MATERIALS[J]. Acta Metall Sin, 1983, 19(3): 65-71.

摘要 参考文献 相关文章 Metrics 全文: PDF(498 KB)   摘要: 本文从裂纹顶端位错运动的简化模型估计形成塑性区所消耗的功;从而计算临界裂纹扩展力。由于Ⅰ型加载和Ⅱ型加载的应力状态有所不同,裂纹顶端塑性功耗也会不一样。基于上述思想,考虑了小范围屈服的K_(Ⅰc)和K_(Ⅱc)的关系,得出K(Ⅱc)>K(Ⅰc)的结论,符合实验结果;并就K(Ⅱc)/K(Ⅰc)的比值与材料性能和温度的关系作了讨论。 Abstract：The work done in the formation of plastic zone at the crack tip has been evaluated with a simplified dislocation model and then the critical crack extension force may be calculated. Under various types of deformation, the magnitudes of work done in the plastic zone formation are different due to their different stress distributions at the crack tip. In view of the abovementioned approaches and of consideration of the correlation between K_(Ⅰc) and K_(Ⅱc) for a small scale yielding material, it has come to the conclusion: IK_(Ⅱc)>K_(Ⅰc), which is consistent in the experimental results. The ratio K_(Ⅱc)/K_(Ⅰc) and the temperature dependence of the mechanical properties of materials have been also discussed. 收稿日期: 1983-03-18      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 龙期威 高桦 44.8K 链接本文: https://www.ams.org.cn/CN/      或      https://www.ams.org.cn/CN/Y1983/V19/I3/65 1 Erdogan, F.; Sih, G. C., J. Basic Eng., 85 (1963) , 519． 2 Sih, G. C., Methods of Analysis and Solutions of Crack Problems, Nordhoff Int. Publ., Leyden, 1973, p. 221． 3 Wang Tzuchiang (王自强), Advance in Research on the Strength and Fracture of Materials, Vol. 4, 4th Int. Conf. Fracture, June 1977, Canada, Eds. Taplin, D. M. R., p.135． 4 高桦;王自强;杨成寿;周爱华,金属学报,15(1979) ,380． 5 Bilby, B. A.; Swinden, K. H., Proc. R. Soc., (London), Ser. A285 (1965) ,22． 6 Vitek, V., J. Mech. Phys., Solids, 24 (1976) , 263． 7 Riedel, H., ibid., 24 (1976) , 277． 8 D.布洛克,工程断裂力学基础,王克仁等译,科学出版社,1980,p.276． 9 Lung Chi-wei(龙期威),Scientia Sinica(中国科学),23(1980) .441． No related articles found! Viewed Full text Abstract Cited   Shared      Discussed