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首页> 外文会议>First International Conference on Computational Methods in Materials Characterisation; Santa Fe, New Mexico >Material-independent solution for the distributions of stress and plastic strain on the neck section
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Material-independent solution for the distributions of stress and plastic strain on the neck section

机译：与材料无关的解决方案，用于在颈部上分配应力和塑性应变

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摘要

The stress and strain distributions across the necked section of tensile specimens is needed for a real stress-strain characterization of ductile materials in the highly deformed phase of their life. The better method currently available to evaluate the above distributions conies from Bridgman, which gives material curves affected by an error ranging from 3% to more than 10%. Furthermore, the application of this method requires a considerable amount of work in measuring the curvature radii of the necking profile at different stages of each tensile test. In this paper a new material-independent model for the solution of the necking problem is presented, based on the matching of experimental observations and numerical analyses.. The stress and strain distributions on the neck are derived according to the proposed model, achieving a numerical-experimental error less than half that obtainable with the Bridgman method. The new method does not require experimental measurements exceeding those of load and cross section.
机译：拉伸样品颈缩部分的应力和应变分布对于延展性材料在其生命的高度变形阶段的真实应力-应变特征是必需的。目前，可用更好的方法来评估Bridgman的上述分布圆锥，该方法给出的材料曲线受3％到10％以上的误差影响。此外，该方法的应用需要在每次拉伸测试的不同阶段测量缩颈轮廓的曲率半径方面的大量工作。在实验观察和数值分析的基础上，提出了一种新的材料独立模型，用于解决颈缩问题。根据所提出的模型推导了颈部的应力和应变分布，得到了一个数值模型。 -实验误差小于Bridgman方法可获得的误差。新方法不需要超过载荷和横截面的实验测量。

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