In this work, we have derived a constitutive law describing the elasto-plastic response of tungsten by applying an inverse finite element analysis (IFEA) to grasp the deformation well beyond the onset of deformation instability in tensile tests. A model based on the Kocks-Mecking representation of thermally-activated dislocation-mediated plasticity was applied to characterise the mechanical response of tungsten compliant with the ITER specification. The developed model accurately describes the temperature and strain rate dependent tensile properties in the temperature range 250–600 °C. The capability to extrapolate the hardening law to a higher temperature and strain rate range is demonstrated. A particular advantage of the developed method is its applicability to neutron irradiated materials, for which the uniform elongation is often very low or even negligible.

在这项工作中，我们通过应用逆有限元分析（IFEA）来掌握钨的弹塑性响应的本构定律，以把握拉伸试验中超出变形不稳定性开始时的变形。应用基于热活化位错介导的可塑性的Kocks-Mecking表示的模型来表征符合ITER规范的钨的机械响应。所开发的模型准确地描述了温度和应变率在250–600°C范围内的拉伸特性。证明了将硬化规律外推到较高温度和应变速率范围的能力。所开发方法的一个特别优点是它适用于中子辐照材料，