PBX Behaviors Accounting for Crystal/Binder Interface Debonding

and Binder Viscoelasticity

Henry TanSchool of Mechanical, Aerospace and Civil Engineering

The University of Manchester

Collaborators:

C. Liu (Los Alamos National Laboratory)P.H. Geubelle (NASA Illinois Space Consortium, UIUC)

Y. Huang (Northwestern University)

DYMAT Meeting: The High Rate Mechanical Properties of Energetic Materials, their Binders or Simulants

PBX 9501

Skidmore et al., 1997. Los Alamos National Lab

coarse particleaverage radius: 125m

fine particleaverage radius: 4m

• Large particle volume fraction• Bimodal size distribution of energetic crystals• High specific surface of crystal/binder interfaces

Cracking under Quasi-Static Loading

Rae et al. 2002. Cavendish Laboratory, Cambridge

crack

HMX crystals

• Cracks propagate mainly through the debonding of interfaces

Objectives

1. To determine the interface cohesive law for plastic bonded energetic materials

2. To establish a constitutive model for plastic bonded composite materials that accounts for• nonlinear interface debonding• binder viscoelasticity

To study the effects of interface debonding and binder viscoelasticity on behaviours of energetic composite materials