Theses and Dissertations

Issuing Body

Mississippi State University

Advisor

Priddy, Mathew

Committee Member

Dickel, Doyl

Committee Member

Sherburn, Jesse

Date of Degree

8-12-2026

Original embargo terms

Visible MSU Only 2 Years

Document Type

Graduate Thesis - Campus Access Only

Major

Computational Engineering

Degree Name

Master of Science (M.S.)

College

James Worth Bagley College of Engineering

Department

Computational Engineering Program

Abstract

A calibration strategy is proposed to identify the material parameters in the Johnson-Cook (JC) constitutive model and an enhanced high-rate variant for application in terminal ballistic simulations. The objectives were to characterize a 316L austenitic stainless steel with a reduced experimental program consisting of quasi-static tension and Taylor impact tests and then calibrate both constitutive models using finite element simulations and a surrogate-assisted optimization algorithm. Emphasis was made on whether the proposed inverse method could arrive at a consistent set of parameters and if the calibrated models were transferable to projectile penetration problems. The study showed that all five parameters within the JC model could be determined consistently with only a quasi-static stress-strain curve and two Taylor impact deformation profiles at different velocities. The enhanced high-rate JC model required one additional tension test at an intermediate strain rate (0.01 s⁻¹) to constrain the strain-rate sensitivity. The calibrated models reproduced the Taylor impact response within 1% error and accurately predicted residual velocity trends in two separate ballistic experiments, demonstrating the effectiveness of the proposed strategy for data-efficient and transferable model calibration.

Download

Share

COinS