Modeling of Transient Thermal Damage in Ceramics for Cannon Bore Applications
Abstract
Higher and more sustained cannon combustion-gas temperatures have led to interest in ceramics as a thermal barrier material at a cannon bore. Some initial work with SiC [1] showed cracks at a surface heated by a laser to similar temperature and duration as severe cannon firing. Finite difference and solid mechanics analysis of the thermal damage indicated that failure near the surface occurred when the transient thermal stress exceeded the reduced high-temperature compressive strength, leading to permanent compressive strain and subsequent tensile residual stress and cracking upon cooling. The purpose here is to perform laser-heating tests with seven additional ceramics and to compare damage from laser heating with that predicted from modeling hot-gas heating typical of cannon firing. In this case, the finite difference calculation of transient temperature includes detailed time-varying values of cannon gas temperature and convection coefficient, allowing a more realistic characterization of cannon thermal damage.
Document Details
- Document Type
- Technical Report
- Publication Date
- Mar 01, 2004
- Accession Number
- ADA590201
Entities
People
- Gregory N. Vigilante
- John H. Underwood
- Mark M. Todaro
Organizations
- United States Army Armament Research, Development and Engineering Center