Hot-spot model for calculating the threshold for shock initiation of pyrotechnic mixtures
A model for predicting the pressure required to initiate a reaction in pyrotechnic mixtures is described. The pore temperature is determined by calculating the dynamics of pore collapse. An approximate solution for the motion of the pore radius is determined as a function of the pore size, viscosity, yield stress and pressure. The heating of the material surrounding the pore is given by an approximate solution of the heat conduction equation with a source term accounting for viscoplastic heating as a function of the pore motion. Ignition occurs when the surface temperature of the pore matches the hot-spot ignition criterion. The hot-spot ignition temperatures for 2Al/Fe/sub 2/O/sub 3/, Ti/2B, and Ti/C are determined. Predictions for the ignition pressure of 2Al/Fe/sub 2/O/sub 3/ (thermite) are in resonable agreement with experiment. 18 refs.
- Research Organization:
- Lawrence Livermore National Lab., CA (USA)
- DOE Contract Number:
- W-7405-ENG-48
- OSTI ID:
- 5594755
- Report Number(s):
- UCRL-94039; CONF-860739-13; ON: DE86011638
- Resource Relation:
- Conference: 11. international pyrotechnics seminar, Vail, CO, USA, 7 Jul 1986; Other Information: Portions of this document are illegible in microfiche products
- Country of Publication:
- United States
- Language:
- English
Similar Records
Thermal ignition of pyrotechnics with lasers
SCB ignition of pyrotechnics, thermites and intermetallics
Related Subjects
42 ENGINEERING
CHEMICAL EXPLOSIVES
MATHEMATICAL MODELS
MIXTURES
HEAT TRANSFER
IGNITION
SHOCK WAVES
THERMODYNAMICS
DISPERSIONS
ENERGY TRANSFER
EXPLOSIVES
450100* - Military Technology
Weaponry
& National Defense- Chemical Explosions & Explosives
420400 - Engineering- Heat Transfer & Fluid Flow