The effect of interface shock viscosity on the strain rate induced temperature rise in an energetic material analyzed using the cohesive finite element method
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Authors
Prakash, Chandra
Gunduz, I. Emre
Tomar, Vikas
Subjects
energetic material
CFEM
shock viscosity
CFEM
shock viscosity
Advisors
Date of Issue
2019
Date
2019
Publisher
IOP Publishing
Language
en_US
Abstract
In this work, shock induced failure and local temperature rise behavior of a hydroxyl-terminated polybutadiene (HTPB)—ammonium perchlorate (AP) energetic material is modeled using the cohesive finite element method (CFEM). Thermomechanical properties used in the model were obtained from four different experiments: (1) dynamic impact experimental measurements for fitting a viscoplastic constitutive model, (2) in situ mechanical Raman spectroscopy (MRS) measurements of the separation properties for fitting a cohesive zone model, (3) a pulse laser induced particle impact experiment combined with the MRS for measurement of the interface shock viscosity, and (4) Raman thermometry experiments for measurement of HTPB, AP, and HTPB-AP interface thermal conductivity. HTPB-AP interface regions with high density of particles were found to be more susceptible to local temperature rise due to the presence of viscoplastic dissipation as well as frictional heating. The increase in the interface shock viscosity lead to a decrease in both the viscoplastic and frictional dissipation. This resulted in a decrease in the maximum temperature and the density of local regions with a maximum temperature rise within the HTPB-AP microstructure. A power law relation for the decrease in viscoplastic energy dissipation, temperature rise and the density of the local temperature rise with the interface shock viscosity was obtained.
Type
Article
Description
The article of record as published may be found at https://doi.org/10.1088/1361-651X/ab2224
Series/Report No
Department
Mechanical and Aerospace Engineering (MAE)
Physics
Organization
Naval Postgraduate School
Identifiers
NPS Report Number
Sponsors
Funding
Format
25 p.
Citation
Prakash, Chandra, I. Emre Gunduz, and Vikas Tomar. "The effect of interface shock viscosity on the strain rate induced temperature rise in an energetic material analyzed using the cohesive finite element method." Modelling and Simulation in Materials Science and Engineering 27.6 (2019): 065008.
Distribution Statement
Rights
This publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.