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首页> 外文期刊>The Physics of Metals and Metallography >Interrelation between the Instability and Mesoscopic Inhomogeneity of Plastic Deformation: III. Simulation and Analysis of Discontinuous Flow with Allowance for Its Dependence on the Degree of Deformation and Rate of Tension
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Interrelation between the Instability and Mesoscopic Inhomogeneity of Plastic Deformation: III. Simulation and Analysis of Discontinuous Flow with Allowance for Its Dependence on the Degree of Deformation and Rate of Tension

机译：塑性变形的不稳定性和介观不均匀性之间的相互关系：III。考虑变形程度和张力的不连续流动的仿真分析

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A nonlinear model of plastic-deformation stability with allowance for local mesoscopic inhomogeneity, which has been suggested in previous works [Phys. Met. Metallogr. 92 (3), 89-95, 96-112 (2001)], is developed in more detail. Equations that describe discontinuous-flow serrations have been obtained and numerical simulation of serrations of various types, as well as of transitions from macrouniform deformation to discontinuous flow and then to global loss of stability in the neck before fracture, have been derived. Wsing numerical simulation, factors that are responsible for an increase in the height of serrations and a decrease in the frequency of serration with continuing deformation and decreasing tensile strain rate have been established. It is shown that an increase in the tensile strain rate can lead to a drop in the rate of plastic deformation at the moment of deformation localization (formation of a deformation band). Dependences of the critical deformation for the beginning of discontinuous flow on the tensile strain rate are analyzed. The results obtained are in good agreement with experimental data and make it possible to explain a number of general features of discontinuous flow.
机译：塑性变形稳定性的非线性模型，考虑了局部介观的不均匀性，这在先前的工作中已经提出[Phys。大都会Metallogr。 92（3），89-95、96-112（2001）]中有更详细的描述。已经获得了描述不连续流动锯齿的方程式，并且推导了各种类型的锯齿的数值模拟，以及从宏观均匀变形到不连续流动，然后到断裂前颈部整体稳定性的转变的数值模拟。通过数值模拟，已经确定了导致锯齿高度增加和锯齿频率随连续变形和拉伸应变率降低而降低的因素。可以看出，拉伸应变率的增加会导致在变形局部化（变形带的形成）时塑性变形率下降。分析了不连续流动开始时的临界变形对拉伸应变率的依赖性。获得的结果与实验数据非常吻合，并可以解释许多不连续流动的一般特征。

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