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首页> 外文期刊>Philosophical transactions of the Royal Society. Mathematical, physical, and engineering sciences >On localization and void coalescence as a precursor to ductile fracture
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On localization and void coalescence as a precursor to ductile fracture

机译：关于局部化和空隙合并作为韧性断裂的先兆

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摘要

Two modes of plastic flow localization commonly occur in the ductile fracture of structural metals undergoing damage and failure by the mechanism involving void nucleation, growth and coalescence. The first mode consists of a macroscopic localization, usually linked to the softening effect of void nucleation and growth, in either a normal band or a shear band where the thickness of the band is comparable to void spacing. The second mode is coalescence with plastic strain localizing to the ligaments between voids by an internal necking process. The ductility of a material is tied to the strain at macroscopic localization, as this marks the limit of uniform straining at the macroscopic scale. The question addressed is whether macroscopic localization occurs prior to void coalescence or whether the two occur simultaneously. The relation between these two modes of localization is studied quantitatively in this paper using a three-dimensional elastic-plastic computational model representing a doubly periodic array of voids within a band confined between two semi-infinite outer blocks of the same material but without voids. At sufficiently high stress triaxiality, a clear separation exists between the two modes of localization. At lower stress triaxialities, the model predicts that the onset of macroscopic localization and coalescence occur simultaneously.
机译：塑性流局部化的两种模式通常发生在结构金属的延性断裂中，该断裂通过涉及空核，生长和聚结的机制而遭受破坏和破坏。第一种模式由宏观定位组成，通常与正常带或剪切带中的空隙成核和生长的软化作用有关，在正常带或剪切带中，带的厚度与空隙间隔相当。第二种模式是通过内部颈缩过程通过塑性应变局部化到空隙之间的韧带而聚结。材料的延展性与宏观局部应变有关，因为这标志着宏观尺度上均匀应变的极限。解决的问题是宏观定位是否发生在空隙合并之前，或者两者是否同时发生。本文使用三维弹塑性计算模型定量研究了这两种定位模式之间的关系，该模型代表了在相同材料的两个半无限外块之间限定的带内无空隙的空隙的双周期排列。在足够高的应力三轴性下，两种定位模式之间存在清晰的分隔。在较低的三轴应力下，该模型预测宏观定位和聚结同时发生。

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