The Split Hopkinson Bar and
Calibration of the Johnson-Cook Constitutive and Damage-Fracture Models
February 4 - 6, 2026
Gangneung, South Korea
Presented by Prof. Hyunho Shin, Gangneung-Wonju National University
Hosted by Dyn Tech Inc., in Gangneung, South Korea.
Supported by Gangneung-Wonju National University, South Korea.
This short course is designed to equip professional engineers, researchers, and postgraduate students with practical knowledge in Mechanical Material Modeling for Simulation—specifically focusing on the split Hopkinson bar and the calibration of the Johnson-Cook constitutive model and Johnson-Cook damage fracture model.
The course includes exercises on modeling the mechanical properties of materials for simulations involving large structural deformations, fractures, impact, crashworthiness, high-speed machining, penetration, explosions, and blasting.
The course will cover the following topics:
Additional details are:
1. In this short course, we provide virtual or ground-truth experimental data, then practice processing the data and discuss related theories. Equipment handling and laboratory data acquisition are not included.
2. The software developed by the presenter will be freely distributed to attendees in its latest version.
Two types of open-source solvers for the Pochhammer-Chree equation: one designed for n = 1 and another capable of handling up to n = 20.
An iterative dispersion correction program written in MATLAB, available as open-source software.
An Excel Macro program for the strain rate equation.
An Excel template designed to calibrate the Johnson-Cook fracture model by incorporating the varying characteristics of triaxiality throughout the loading process.
Other Excel templates for calibrating the Johnson-Cook constitutive and fracture models.
3. Most of the course will cover metal materials using J2 plasticity theory based on von-Mises yield criterion, while discussing ceramics, concrete, rocks, soil, rubber, and polymers within a feasible scope during the Q&A session.
4. The scope of this short course on the Split Hopkinson Bar includes both the Split Hopkinson Pressure Bar and the Split Hopkinson Tension Bar. The Split Hopkinson Torsion Bar is excluded.
5. Please bring a notebook with Excel installed, as laptops will not be provided for this short course. We believe that achieving results using Excel demonstrates a true understanding of the calibration process. It is preferable to maximize what can be accomplished with Excel while minimizing reliance on more advanced optimization tools, which should be used only after fully comprehending the calibration process established through Excel. If MATLAB is also installed, attendees will find the exercises on related topics more engaging and beneficial.
6. The course includes the presentation of results obtained using commercial software, such as finite element (FE) packages and MATLAB, but does not cover the methods for operating the software itself. This topic is addressed in classes offered by authorized training agencies affiliated with the software companies.
7. The course fee includes all working materials, such as printed handouts, Excel macro programs, MATLAB scripts, and Excel templates developed by the presenter. It also covers lunch, coffee, tea, and snacks.
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