CSAR Seminar
SPEAKER: Henry Tan, UIUC/MIE
TITLE:
Stability of Interface Debonding in Particulate Composite Materials
DATE: Wednesday, April 12, 2006
TIME: 12:00 Noon
PLACE: 2240 DCL
1304 W. Springfield Ave., Urbana, IL
ABSTRACT
Both solid propellants and high explosives can be treated as
particulate composite materials with high specific surface of
interfaces. Numeric simulations show that particles can debond
non-uniformly from the matrix, and the non-uniform debonding occurs
suddenly. We call this phenomenon unstable interface debonding.
Stability of interface debonding in energetic composite materials is
an important issue that can affect the safety and sensitivity of the
system. Through micromechanics modeling, we establish a stability
criterion for interface debonding in particulate composite materials.
The stability theory is then applied to two experimental observations,
one relates to the particle size effect on the explosiveness of high
explosives, the other relates to the experimentally observed chaotic
deformation during the phase transformation of energetic particles in
the high explosive PBX 9501.