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引用次数: 0
摘要
在氢化学平衡、稳态热传导和线性弹性金属行为的条件下,对裂缝前的氢化物析出进行了研究。极限条件是通过材料变形、氢扩散和能量流等运行物理机制的相互作用来实现的。对固溶体中的氢浓度分布、氢化物体积分数和应力分量以及氢化物析出区边界提出了分析关系。结果表明,在氢化物析出区内有一个环形区域,该区域的应力虽然根据 \(1/sqrt{r}\)-singularity 变化,但与众所周知的 K 场有明显偏差,根据氢化物析出前后静水压力的差异,该区域的应力较小。氢化物析出区随着裂纹尖端约束(由 T 应力给出)的增加而增大。此外,温度梯度通过控制应力轨迹分布影响氢化物析出区的大小。
Elastic crack-tip field in hydride forming metals under hydrogen chemical equilibrium
Hydride precipitation ahead of a crack is examined under conditions of hydrogen chemical equilibrium, steady-state heat conduction and linear elastic metal behavior. The limiting conditions are approached via the interaction of the operating physical mechanisms of material deformation, hydrogen diffusion and energy flow. Analytical relations are presented for the distributions of hydrogen concentration in solid solution, hydride volume fraction and stress components, as well as for the hydride precipitation zone boundary. It is shown that there is an annulus, within the hydride precipitation zone, where stresses, although vary according to \(1/\sqrt{r}\)—singularity, deviate significantly from the well-known K-field, being smaller, according to the difference of hydrostatic stress before and after hydride precipitation. The hydride precipitation zone increases with crack-tip constraint, given by T-stress. In addition, temperature gradient affects hydride precipitation zone size, by controlling stress trace distribution.
期刊介绍:
The International Journal of Fracture is an outlet for original analytical, numerical and experimental contributions which provide improved understanding of the mechanisms of micro and macro fracture in all materials, and their engineering implications.
The Journal is pleased to receive papers from engineers and scientists working in various aspects of fracture. Contributions emphasizing empirical correlations, unanalyzed experimental results or routine numerical computations, while representing important necessary aspects of certain fatigue, strength, and fracture analyses, will normally be discouraged; occasional review papers in these as well as other areas are welcomed. Innovative and in-depth engineering applications of fracture theory are also encouraged.
In addition, the Journal welcomes, for rapid publication, Brief Notes in Fracture and Micromechanics which serve the Journal''s Objective. Brief Notes include: Brief presentation of a new idea, concept or method; new experimental observations or methods of significance; short notes of quality that do not amount to full length papers; discussion of previously published work in the Journal, and Brief Notes Errata.