Xiang Junfeng, Xie Lijing, Gao Feinong, Zhang Yu, Yi Jie, Wang Tao, Pang Siqin, Wang Xibin
School of Mechanical Engineering, Beijing Institute of Technology, Beijing 100081, China.
National Key Laboratory of Science and Technology on Micro/Nano Fabrication, Peking University, Beijing 100871, China.
Materials (Basel). 2018 Jan 11;11(1):97. doi: 10.3390/ma11010097.
Discrepancies in capturing material behavior of some materials, such as Particulate Reinforced Metal Matrix Composites, by using conventional ad hoc strategy make the applicability of Johnson-Cook constitutive model challenged. Despites applicable efforts, its extended formalism with more fitting parameters would increase the difficulty in identifying constitutive parameters. A weighted multi-objective strategy for identifying any constitutive formalism is developed to predict mechanical behavior in static and dynamic loading conditions equally well. These varying weighting is based on the Gaussian-distributed noise evaluation of experimentally obtained stress-strain data in quasi-static or dynamic mode. This universal method can be used to determine fast and directly whether the constitutive formalism is suitable to describe the material constitutive behavior by measuring goodness-of-fit. A quantitative comparison of different fitting strategies on identifying Al6063/SiC's material parameters is made in terms of performance evaluation including noise elimination, correlation, and reliability. Eventually, a three-dimensional (3D) FE model in small-hole drilling of Al6063/SiC composites, using multi-objective identified constitutive formalism, is developed. Comparison with the experimental observations in thrust force, torque, and chip morphology provides valid evidence on the applicability of the developed multi-objective identification strategy in identifying constitutive parameters.
采用传统的临时策略来捕捉某些材料（如颗粒增强金属基复合材料）的材料行为时存在差异，这使得约翰逊 - 库克本构模型的适用性受到挑战。尽管做出了适用的努力，但其具有更多拟合参数的扩展形式会增加本构参数识别的难度。开发了一种用于识别任何本构形式的加权多目标策略，以在静态和动态加载条件下同样良好地预测力学行为。这些变化的权重基于在准静态或动态模式下实验获得的应力 - 应变数据的高斯分布噪声评估。这种通用方法可用于通过测量拟合优度快速直接地确定本构形式是否适合描述材料的本构行为。从包括噪声消除、相关性和可靠性在内的性能评估方面，对识别Al6063/SiC材料参数的不同拟合策略进行了定量比较。最终，利用多目标识别的本构形式开发了Al6063/SiC复合材料小孔钻削的三维（3D）有限元模型。与推力、扭矩和切屑形态的实验观察结果进行比较，为所开发的多目标识别策略在识别本构参数方面的适用性提供了有效证据。
