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何艳骄, 马宇宏, 田永喜, 树学峰, 肖革胜. 基于优化算法及压痕形貌的金属塑性力学参数表征[J]. 力学学报.
引用本文: 何艳骄, 马宇宏, 田永喜, 树学峰, 肖革胜. 基于优化算法及压痕形貌的金属塑性力学参数表征[J]. 力学学报.
CHARACTERIZATION OF METAL PLASTIC MECHANICAL PARAMETERS BASED ON THE OPTIMIZATION ALGORITHM AND INDENTATION MORPHOLOGY[J]. Chinese Journal of Theoretical and Applied Mechanics.
Citation: CHARACTERIZATION OF METAL PLASTIC MECHANICAL PARAMETERS BASED ON THE OPTIMIZATION ALGORITHM AND INDENTATION MORPHOLOGY[J]. Chinese Journal of Theoretical and Applied Mechanics.

基于优化算法及压痕形貌的金属塑性力学参数表征

CHARACTERIZATION OF METAL PLASTIC MECHANICAL PARAMETERS BASED ON THE OPTIMIZATION ALGORITHM AND INDENTATION MORPHOLOGY

  • 摘要: 相比于需要特定形状尺寸试样的传统力学测试手段,压入法具有试样加工方便及可实现原位测试等优点,针对现有压入表征法对所采集压入载荷–深度曲线的依赖性,通过作为压入后材料塑性力学性能直观响应的残余压痕形貌有效获取金属塑性力学参数可提供一种新的压入表征方法;本研究通过Instron万能材料试验机与轮廓形态系统开展了紫铜/镁合金的球形压入测试及压痕残余形貌特征提取,将压入数值模拟与实验测试所得残余压痕形貌的对比结果作为拟合优度,对传统Nelder-Mead算法在参数筛除、预处理、重复性判断及收敛条件方面进行改进以保证进入数值计算的材料参数的合理性并提高计算效率,基于Abaqus二次开发结合改进的Nelder-Mead算法进行参数寻优以得到紫铜/镁合金的相关塑性参数;将算法寻优结果与传统单轴拉伸测试表征所得塑性参数值予以对比,验证了所提出基于优化算法及残余压痕形貌获取金属塑性参数方法的有效性,相关研究提供了一种新的有效表征金属力学性能参数的方法。

     

    Abstract: Compared with the traditional mechanical testing method requiring samples of specific shape and size, the indentation method has the advantages of simple manufacturing of samples and in situ testing. The existing indentation characterization methods mainly rely on the indentation load–depth curve, whereas the residual indentation morphology is an intuitive response to material plastic mechanical properties. The effective acquisition of metal plastic parameters via residual indentation morphology can provide a new characterization method for metal plastic mechanical properties. In this study, a spherical indentation test and the residual indentation morphology feature extraction of Cu/Mg were conducted using the Instron universal material testing machine and the contour morphology system. The comparison result of the residual indentation morphology from indentation numerical simulation and the experimental test was taken as the goodness of fit. The related improvements of parameter screening, preprocessing, repeatability judgment, and convergence conditions were carried out on the traditional Nelder-Mead algorithm, to discard the data less than zero, determine the initial value range of the optimization parameters, and improve the efficiency of optimization calculation. Based on the secondary development of Abaqus software and the improved Nelder-Mead algorithm, optimization was performed to obtain the plastic mechanical parameters of Cu/Mg. Moreover, the related plastic mechanical parameters of Cu/Mg were acquired through the conventional uniaxial tensile test and characterization. The effectiveness of the proposed method for obtaining metal plastic parameters based on the optimization algorithm and residual indentation morphology was verified by comparing the optimization results from the algorithm and the tensile test characterization results. Relevant research provides a new and effective method for characterizing the mechanical properties parameters of metals.

     

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