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Modified Johnson-Cook model fits silicone adhesive high-strain-rate data

Close-up photograph showing dark liquid adhesive being applied to metal surfaces arranged in a grid pattern on a light background, with blue material samples visible, demonstrating materials testing or adhesive application in a laboratory context.
Research area:EngineeringStrain rateMaterial properties

What the study found

A calibrated Modified Johnson-Cook material model for silicone adhesive gave good agreement with split-Hopkinson pressure bar (SHPB; a high strain rate test) data. The study also found that two previously used epoxide models matched epoxide SHPB data well.

Why the authors say this matters

The authors say the silicone adhesive model is, to their knowledge, not available in the open literature and can be used in commercial finite-element method (FEM) software without creating a new user-defined material. The study suggests this reduces implementation complexity.

What the researchers tested

The researchers calibrated an empirical material model for a silicone adhesive by fitting it to experimental data across a range of high strain rates. They then verified the model against SHPB data from ceramic/steel material couples bonded with silicone adhesive, and used numerical simulation to test several epoxide models from the literature on similar SHPB data.

What worked and what didn't

For silicone adhesive, the Modified Johnson-Cook model with calibrated parameters predicted 76.2% transmitted strain, compared with the experimental value of 70.4%. For epoxides, the Plastic-Kinematic model with Cowper-Symonds strain rate scaling predicted 95.5% transmitted strain, and the Johnson-Cook model with the Grüneisen equation of state predicted 97.6%, versus the experimental value of 91.2%.

What to keep in mind

The abstract does not describe detailed limitations beyond the scope of the SHPB verification and the specific materials tested. The results reported here are limited to the silicone adhesive and epoxide cases described in the study.

Key points

  • A calibrated Modified Johnson-Cook model was developed for silicone adhesive.
  • The silicone adhesive model was verified against SHPB data from ceramic/steel material couples.
  • For silicone adhesive, the simulation predicted 76.2% transmitted strain versus 70.4% experimentally.
  • For epoxides, the Plastic-Kinematic model with Cowper-Symonds scaling and the Johnson-Cook model with the Grüneisen equation of state both matched SHPB data well.
  • The authors state the silicone adhesive model can be implemented in commercial FEM software without a new user-defined material.

Disclosure

Research title:
Modified Johnson-Cook model fits silicone adhesive high-strain-rate data
Authors:
Frederick E. Hamlyn, Christopher M. Harvey, Sina S. Yarahmadi, Gary W. Critchlow
Institutions:
Loughborough University
Publication date:
2026-03-29
DOI:
10.1016/j.ijadhadh.2026.104339
OpenAlex record:
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AI provenance: This post was generated by OpenAI. The original authors did not write or review this post.

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