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<p>In this work, the spatiotemporal beha<i>v</i>iors and the effect of machine stiffness on the Portevin-Le Chatelier (PLC) effect in Ti-15Mo alloy are quantitatively investigated by numerical simulation supported by experimental validation. The McCormick (MC) constitutive model parameters are precisely identified, and a 3D finite element (FE) model integrated with the calibrated MC constitutive model is developed and rigorously validated by experiments. Numerical results reveal distinct strain staircases and a pronounced increase in the slope of strain-time curve, corresponding to the transition from elastic to plastic deformation. The average stress drop magnitude exhibits a bimodal distribution, peaking at 13.7&#xa0;MPa, and generally decreases as increasing strain rate and machine stiffness. Moreover, the PLC band width demonstrates significant fluctuations in the early stage and then stabilizing at about 2&#xa0;mm with increasing strain. Additionally, the PLC band propagation basically appears as continuous and hopping propagations, with continuity markedly enhanced by higher machine stiffness.</p>

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Numerical investigation of Portevin-Le Chatelier effect in Ti-15Mo alloy considering machine stiffness effect

  • 期刊论文

  • 发表日期：

    2026年4月29日

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  • Shiyuan Luo,
  • Shicong Hu,
  • Liang Xiao,
  • Yaru Liu,
  • Gui Li

摘要

In this work, the spatiotemporal behaviors and the effect of machine stiffness on the Portevin-Le Chatelier (PLC) effect in Ti-15Mo alloy are quantitatively investigated by numerical simulation supported by experimental validation. The McCormick (MC) constitutive model parameters are precisely identified, and a 3D finite element (FE) model integrated with the calibrated MC constitutive model is developed and rigorously validated by experiments. Numerical results reveal distinct strain staircases and a pronounced increase in the slope of strain-time curve, corresponding to the transition from elastic to plastic deformation. The average stress drop magnitude exhibits a bimodal distribution, peaking at 13.7 MPa, and generally decreases as increasing strain rate and machine stiffness. Moreover, the PLC band width demonstrates significant fluctuations in the early stage and then stabilizing at about 2 mm with increasing strain. Additionally, the PLC band propagation basically appears as continuous and hopping propagations, with continuity markedly enhanced by higher machine stiffness.