Dislocation viscoplasticity aspects of material fracturing
Dislocation viscoplasticity aspects of material fracturing
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DOI：
10.1016/j.engfracmech.2010.02.019
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发表时间：
2010-05
影响因子：
5.4
通讯作者：
R. Armstrong
中科院分区：
文献类型：
--
作者：
R. Armstrong
位错粘塑性，无论是在裂纹出现之前、期间还是之后发生，并且除了所需的裂纹表面能之外还需要能量需求，已被证明是应用于固体材料断裂特性的简单强度/能量评估的祸根。乔治·欧文（George Irwin）在后来的几年中，将注意力转向了与核压力容器钢所获得的断裂行为的复杂微观结构方面相关的裂纹影响的粘塑性考虑。本文回顾了这项工作，更广泛地研究了断裂行为的位错塑性方面，在更小的裂纹尺寸下，适用于更广泛的材料，特别是硬度相对较高的材料。
Dislocation viscoplasticity, whether occurring before, during, or after the appearance of cracking, and with energy requirement additional to needed crack surface energy, has proved to be the bane of simplistic strength/energy evaluations applied to the fracturing properties of solid materials. George Irwin, in later years, turned his attention to such crack-effected viscoplasticity consideration in relation to the complex microstructural aspects of fracturing behaviors obtained for nuclear pressure vessel steels. The work is reviewed here with a broader research focus on dislocation plasticity aspects of fracturing behaviors, at ever smaller crack sizes, for a wider range of materials, especially, of relatively greater hardness.