What the study found
The study found that a Modified Johnson-Cook material model can be calibrated for silicone adhesive and matched against high strain rate test data. For epoxides, two previously used models also gave good agreement with split-Hopkinson pressure bar testing data.
Why the authors say this matters
The authors say this matters because the silicone adhesive model can be used without creating a new user-defined material or further developing commercial finite-element method software, which they state reduces implementation complexity. They also say, to their knowledge, that such a silicone adhesive model is not available in the open literature.
What the researchers tested
The researchers calibrated an empirical material model for silicone adhesive using experimental data over a range of high strain rates. They then verified the model against split-Hopkinson pressure bar data from ceramic/steel material couples bonded with silicone adhesive, and used numerical simulation to test several epoxide models from the literature against similar data.
What worked and what didn't
For silicone adhesive, the Modified Johnson-Cook material model showed good agreement with the split-Hopkinson pressure bar results, with the simulation predicting 76.2% transmitted strain versus the experimental 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%, compared with the experimental 91.2%.
What to keep in mind
The abstract does not describe broader validation beyond the reported ceramic/steel material couples and the tested high strain rate conditions. It also does not provide detailed limitations beyond noting that the silicone adhesive model was developed for use in this specific finite-element modelling context.
Key points
- A Modified Johnson-Cook model was calibrated for silicone adhesive.
- The silicone adhesive model was verified against split-Hopkinson pressure bar data.
- For epoxides, the Plastic-Kinematic and Johnson-Cook models both matched test data well.
- The silicone adhesive implementation was described as not requiring a new user-defined material in commercial finite-element software.
- The abstract reports no broader limitations beyond the tested material couples and high strain rate setting.
Disclosure
- Research title:
- High-strain-rate models fit silicone adhesives and epoxides
- Authors:
- Frederick E. Hamlyn, Christopher M. Harvey, Sina S. Yarahmadi, Gary W. Critchlow
- Institutions:
- Loughborough University, Loughborough University, Loughborough University, Loughborough University
- Publication date:
- 2026-03-29
- OpenAlex record:
- View
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