Session: 03-13-01: Testing and Characterization

Paper Number: 152455

152455 - Analysis of Temperature and Strain Rate-Dependent Mechanical Behavior of Thermoplastics: a Comparative Study of Multilinear Kinematic Hardening and the Three-Network Material Models 

This paper investigates the modeling of the temperature-dependent mechanical behavior of thermoplastics through the experimental tension-compression and stress relaxation data of HDPE at three different temperatures. For modeling thermoplastics, J-2-based plasticity models are used extensively.  However, recent advancements in material models based on viscoplasticity formulations, such as the three-network model (TNM), are gaining prominence due to their enhanced capability to predict strain-rate-dependent, temperature-dependent, and non-linear behaviors of thermoplastics with better accuracy and reliability.  This study uses temperature-dependent multilinear kinematic hardening (MKIN) and three-network model (TNM) for predicting the mechanical response of thermoplastics. They are calibrated based on experimental data using Mcalibration Software. The stress-strain response of cyclic behavior of both material models is compared at different temperatures and strain rates. Further, a parametric study of TNM material model parameters is undertaken to understand the sensitivity and its influence on the material behavior. Later, an application use-case simulation of grommet loading-unloading force prediction is performed using both material models at different temperatures. Through grommet simulations, the ability of both material models to predict the mechanical response and permanent deformation of thermoplastics is compared. Overall, the TNM material model demonstrates a significant fidelity gain in predicting the strain rate and temperature-dependent plastic deformations in thermoplastics due to its viscoplastic formulation, in contrast to the J-2 plasticity-based MKIN material model.

Presenting Author: Dhruvin Jasoliya Virginia Polytechnic Institute and State University

Presenting Author Biography: Dhruvin Jasoliya is a PhD student at Virginia Tech and also worked as an intern at ANSYS Inc. Currently, working in areas of advanced constitutive material models and application of meshless methods for modeling dynamic problems.