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Virtual Field Characterization for Ratcheting Effect Under Cyclic Loading

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Abstract

Background

Ratcheting is an important mechanical behavior of metals and alloys, which is caused by the repeated accumulations of tensile and compressive strain in circle load. However, the current characterization methods of ratcheting effect are mostly based on standardized testing and uniform data, and more comprehensive field measurement data cannot be used.

Objective

This paper focuses on how to make full use of field measurement data to characterize ratcheting effect and identify the corresponding kinematic constitutive.

Methods

A nonlinear virtual field method that can invert the parameters of Chaboche constitutive from strain field data is proposed. And a return mapping strategy driven by iteration of internal variables is used to reconstruct the stress field, which ensures the convergence speed and global convergence in the black box search of the nonlinear virtual field method.

Results

By using the finite-element model to generate the strain field data, the numerical experiment shows that the ratchet path identified by the nonlinear virtual field algorithm is basically consistent with the prior ratchet path generated by the finite-element simulation. The adaptability of the algorithm to data density and noise amplitude was also verified: under lower data noise interference, more strain field training data makes the inversion results more accurate; but in the case of high sound amplitude, it is necessary to reduce the data size to obtain accurate fitting results of the ratchet path.

Conclusions

By training the measured field data from 3D-digital image correlation, it is shown that the algorithm can also run effectively under the complex working conditions of non-uniform deformation.

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Acknowledgments

The authors thank the National Natural Science Foundation of China (Nos. 12002078, 11772081, 11972106).

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Authors and Affiliations

  1. School of Materials Science and Engineering, Dalian University of Technology, Dalian, 116024, China

    H. Jiang & H. Dong

  2. State Key Laboratory of Structural Analysis for Industrial Equipment, Dalian University of Technology, Dalian, 116024, China

    Z. Lei, R. Bai, J. Liu & Z. Guo

  3. School of Software Engineering, Dalian University, Dalian, 116622, China

    W. Feng

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  1. H. Jiang
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  2. Z. Lei
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  4. J. Liu
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  7. W. Feng
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Correspondence to Z. Lei or R. Bai.

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Jiang, H., Lei, Z., Bai, R. et al. Virtual Field Characterization for Ratcheting Effect Under Cyclic Loading. Exp Mech 61, 867–883 (2021). https://doi.org/10.1007/s11340-021-00709-6

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  • DOI: https://doi.org/10.1007/s11340-021-00709-6

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