Development and Application of Dynamic Integrated DIC Material Parameters Inversion Method for SHPB Tests

IF 2 3区工程技术 Q2 MATERIALS SCIENCE, CHARACTERIZATION & TESTING

Experimental Mechanics Pub Date : 2024-05-17 DOI:10.1007/s11340-024-01071-z

S. Cai, J. Zhao, Z. Liu, Y. Fu

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引用次数: 0

Abstract

Background

Dynamic mechanical parameters are significant to study the dynamic evolution, but multiple constitutive parameters are difficult to be measured or calculated directly in various dynamic tests. This paper develops a dynamic integrated digital image correlation (DIC) inversion method to characterize multiple parameters of 2A12-T4 aluminum alloy for the split Hopkinson pressure bar (SHPB) test.

Methods

Affine transformation is used to construct virtual deformed images based on time-varying images of dynamic impacts and deformation responses of finite element method (FEM). Through imitating the principle of DIC, the image correlation function embedded the Johnson–Cook constitutive parameters is constructed. The optimal constitutive parameters are obtained by the gradient optimization algorithm when the images are most correlated.

Results

For dynamic tests of same strain rate, optimal parameters are obtained by substituting multiple experimental images to co-invert. By substituting inversion results into the FEM simulation, the simulated stress–strain curve is obtained. Meanwhile by extracting the stress–strain signals of multiple experiments, the real mean stress–strain curve is obtained. Through the coincidence of two stress–strain curves, the feasibility of dynamic integrated DIC inversion method and the accuracy of the inversion results are verified.

Conclusion

This dynamic inversion method is universal to obtain multiple parameters in various dynamic experiments, which considers the strain rate and time-varying. Besides this method simplifies the inversion process and obtains multiple dynamic parameters more easily.

Abstract Image

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用于 SHPB 试验的动态综合 DIC 材料参数反演方法的开发与应用

背景动态力学参数对研究动态演变具有重要意义，但在各种动态试验中难以直接测量或计算多个构成参数。方法根据动态冲击的时变图像和有限元法（FEM）的变形响应，采用阿芬变换构建虚拟变形图像。通过模仿 DIC 原理，构建了嵌入约翰逊-库克（Johnson-Cook）构成参数的图像相关函数。结果对于相同应变率的动态试验，通过替换多个试验图像进行共同反演，可获得最佳参数。将反演结果代入有限元模拟，就能得到模拟应力应变曲线。同时，通过提取多个实验的应力应变信号，得到真实的平均应力应变曲线。通过两条应力应变曲线的重合，验证了动态积分 DIC 反演方法的可行性和反演结果的准确性。此外，该方法简化了反演过程，更容易获得多个动态参数。

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来源期刊

Experimental Mechanics 物理-材料科学：表征与测试

CiteScore

4.40

自引率

16.70%

发文量

111

审稿时长

3 months

期刊介绍： Experimental Mechanics is the official journal of the Society for Experimental Mechanics that publishes papers in all areas of experimentation including its theoretical and computational analysis. The journal covers research in design and implementation of novel or improved experiments to characterize materials, structures and systems. Articles extending the frontiers of experimental mechanics at large and small scales are particularly welcome. Coverage extends from research in solid and fluids mechanics to fields at the intersection of disciplines including physics, chemistry and biology. Development of new devices and technologies for metrology applications in a wide range of industrial sectors (e.g., manufacturing, high-performance materials, aerospace, information technology, medicine, energy and environmental technologies) is also covered.