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Updated: Oct 27, 2025

Applying Dynamic Strain on Thin Oxide Films Immobilized on a Pseudoelastic Nickel-Titanium Alloy
Published on: July 28, 2020
Johnson-Cook Parameter Identification for Commercially Pure Titanium at Room Temperature under Quasi-Static Strain
Alice Siegel1,2, Sébastien Laporte2, Fabien Sauter-Starace1
1Clinatec, CEA, LETI, Université Grenoble Alpes, F-38000 Grenoble, France.
Background:
To simulate mechanical shocks on an intracranial implant called WIMAGINE®, Clinatec chose a Johnson-Cook model to account for the viscoplastic behavior of grade 2 titanium in a dynamic study using Radioss©.
Methods:
Thirty tensile specimens were subjected to tensile tests at room temperature, and the influence of the strain rate (8 × 10-3 and 8 × 10-2 s-1) and sandblasting was analyzed. Relaxations were included in the tests to analyze viscosity phenomena.
Results:
A whole set of parameters was identified for the elastic and plastic parts. Strain rate influence on stress was negligible at these strain rates. As expected, the sandblasting hardened the material during the tests by decreasing the hardening parameters, while local necking occurred at an earlier strain.
Conclusions:
This article provides the parameters of a Johnson-Cook model to simulate the elastoplastic behavior of pure titanium (T40, grade 2) in Finite Element Model (FEM) software.
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