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An analysis of the ductile fracture of void containing material: Experimental modeling and computer simulation.

机译：含空隙材料的延性断裂分析：实验建模和计算机仿真。

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摘要

The process of void/pore linking during ductile fracture has been analyzed by both experiment and computer simulation. The initial portion of the study extends previous experimental research in which void/pore distributions are modeled in two-dimensions by random arrays of circular holes characterized by area fraction, size, and minimum spacing between holes. The behavior of tensile specimens containing both random and regular arrays of holes are examined for four materials of varying strain and strain-rate hardening: 7075-T6 aluminum sheet and plate, 1100-0 aluminum sheet, a low carbon steel sheet, and 70-30 alpha brass sheet. The results indicate that fracture in the presence of a random distribution of holes is controlled not only by the area fraction of holes, but also the size and location of adjacent holes as well as material properties. The specimens containing random arrays are always less ductile than their regular-array counterparts. The magnitude of this effect is dependent upon the hole distribution characteristics of the random array and the strain hardening capacity of the material. The results may be understood in terms of a sequential process which depends on shear localization and fracture between voids and which is quite sensitive to void/pore distributions.; In the second portion of the study, a computer model is developed for simulation of the ductile fracture of metals which contain random distributions of voids. Experimentally measured local plasticity near holes provide the basis for the simulation, and predictions of fracture are made without the use of parameters to force fit. The simulation illustrates the process of void linking with strain, is fully consistent with the proposed model, and correctly predicts the failure strains of 1100 aluminum and 70-30 alpha brass over a range of hole/void microstructures.
机译：通过实验和计算机仿真分析了延性断裂过程中空隙/孔的连接过程。该研究的初始部分扩展了先前的实验研究，在该实验中，通过以面积分数，尺寸和孔之间的最小间距为特征的圆形孔的随机阵列，以二维方式对空隙/孔分布进行建模。对于包含不同应变和应变速率硬化的四种材料，检查了包含随机和规则孔阵列的拉伸试样的行为：7075-T6铝板和板材，1100-0铝板，低碳钢板和70- 30 alpha黄铜板。结果表明，存在随机分布孔的情况下的断裂不仅受孔的面积分数控制，而且还受相邻孔的大小和位置以及材料特性的控制。包含随机阵列的标本的延展性始终不如规则阵列的标本。这种影响的大小取决于随机阵列的孔分布特性和材料的应变硬化能力。可以根据顺序过程来理解结果，该过程取决于剪切局部化和空隙之间的断裂，并且对空隙/孔的分布非常敏感。在研究的第二部分中，开发了一个计算机模型来模拟包含空隙随机分布的金属的延性断裂。实验测量的孔附近局部塑性为模拟提供了基础，并且无需使用参数强制拟合即可进行断裂预测。该仿真说明了空隙与应变的联系过程，与所提出的模型完全一致，并正确预测了在一系列孔/空隙微结构范围内的1100铝和70-30 alpha黄铜的破坏应变。

著录项

  • 作者

    Magnusen, Paul Edward.;

  • 作者单位

    Michigan Technological University.;

  • 授予单位 Michigan Technological University.;
  • 学科 Engineering Metallurgy.
  • 学位 Ph.D.
  • 年度 1987
  • 页码 184 p.
  • 总页数 184
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 冶金工业;
  • 关键词

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