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An Inverse Identification Method for the Characterization of Elastic Conforming Contact Behavior During Flat Punch Indentation

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Abstract

Background

The flat punch indentation problem is a typical prototype of conforming contact which can be frequently encountered in many applications. Its characterization is of great difficulty as the interface is embedded and the stress is highly concentrated at the contact boundary.

Objective

In this work, an inverse identification method is developed for reconstructing the interfacial stress during flat punch indentation from the measured displacement field.

Methods

This method consists of a modeling procedure and a characterization procedure. In the modeling, the basic tendencies of interfacial stress distributions are established and the relationship between the stress and displacement are formulated. In the characterization, the parameters in the model, including the profiles of contact interface and the stress distributions are optimized by matching the calculated displacement to the experiment data. Segmentation-aided digital image correlation is implemented for the displacement acquisition near the contact interface. An optimization framework is developed so the different kinds of parameters can be accurately obtained.

Results

Both of simulated experiment and real-world experiment are carried out, and results show that the proposed method can accurately characterize the elastic contact behavior.

Conclusions

The modeling merely constrains the tendencies rather than gives a close-form solution of interfacial stress and the identification only requires the measurement of local displacement, which can greatly increase its applicability in applications.

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Acknowledgements

This research work was supported by the National Natural Science Foundation of China, Grant Nos. 11902196 and 11732009, the supports are gratefully acknowledged.

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Authors and Affiliations

  1. Department of Engineering Mechanics, Shanghai Jiao Tong University, Shangha, 200240, China

    C. Sun, Q. L. Lin & J. B. Chen

  2. Ministry of Education, Key Laboratory of Hydrodynamics, Shanghai Jiao Tong University, Shanghai, 200240, China

    J. B. Chen

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  1. C. Sun
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Correspondence to J. B. Chen.

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Sun, C., Lin, Q.L. & Chen, J.B. An Inverse Identification Method for the Characterization of Elastic Conforming Contact Behavior During Flat Punch Indentation. Exp Mech 62, 745–759 (2022). https://doi.org/10.1007/s11340-021-00811-9

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