Classical calibration procedures for phenomenological thermo-elasto-viscoplastic constitutive models usually involve a large number of tests to identify all the material parameters, leading to long experimental campaigns. In the present work, a novel calibration methodology that takes full advantage of full-field measurements of a heterogeneous test is proposed. It relies on an innovative combination of the Virtual Fields Method and a thermo-mechanical heterogeneous test carried out on a Gleeble 3500 system. To assess the feasibility of this novel calibration methodology, a modified version of the Johnson-Cook (J-C) model and dual-phase steel DP980 are selected. The three terms of the model that correspond to strain-hardening, temperature, and strain rate effects are calibrated simultaneously for the thermo-mechanical behaviour of this material. The calibration is attempted using a single test carried out at a constant displacement rate. This procedure is repeated for three tests at nominal strain rates of ${10}^{-4}$, ${10}^{-3}$ and ${10}^{-2}$ s${}^{-1}$. Accurate predictions of the flow stress are attained, but the information of a single test is insufficient to capture the positive strain rate sensitivity of the material. The three tests are then combined in an experimental database to calibrate the model. The results show that the positive strain rate sensitivity is reasonably predicted in the considered range of temperatures. These results unveil the potential of this methodology to simplify the calibration process of thermo-elasto-viscoplastic constitutive model.

现象学热弹性粘塑性本构模型的经典校准程序通常涉及大量测试以识别所有材料参数，从而导致长时间的实验活动。在目前的工作中，提出了一种充分利用异构测试的全场测量的新型校准方法。它依赖于虚拟场方法和在 Gleeble 3500 系统上进行的热机械异构测试的创新组合。为了评估这种新型校准方法的可行性，选择了 Johnson-Cook (JC) 模型和双相钢 DP980 的修改版本。模型中对应于应变硬化、温度和应变率效应的三个项针对该材料的热机械行为同时进行校准。使用以恒定位移率执行的单个测试尝试进行校准。以 3 次名义应变率重复此过程${10}^{-4}$, ${10}^{-3}$ 和 ${10}^{-2}$ 秒${}^{-1}$. 获得了流变应力的准确预测，但单个测试的信息不足以捕捉材料的正应变率敏感性。然后将这三个测试组合在一个实验数据库中以校准模型。结果表明，在所考虑的温度范围内可以合理地预测正应变率敏感性。这些结果揭示了这种方法在简化热弹粘塑性本构模型校准过程中的潜力。