Viscoelastic-Viscoplastic Strength Model for PBX

TL;DR

This paper introduces a comprehensive viscoelastic-viscoplastic strength model for PBX that accounts for pressure and temperature effects, validated through multiple experimental and simulation methods.

Contribution

It presents a novel strength model for PBX incorporating pressure and temperature effects, calibrated and validated with diverse experimental and FEM simulation data.

Findings

Model accurately predicts PBX deformation under various loads

Validation confirms model's effectiveness in creep and relaxation tests

Experimental results align with simulation predictions

Abstract

We present a material (strength) model for describing the deformation of PBX under quasistatic mechanical and thermal loadings. It is a viscoelastic-viscoplastic model incorporating the effects of pressure and temperature on the strength of PBX. The model is calibrated using uniaxial tension and compression tests. Using FEM simulations in Ls-Dyna, we validated the model with creep and relaxation tests. To further validate the model, we performed an experiment with thermally loaded, biaxially strained, sample and measured its deformation using Digital Image Correlation method.