A Constitutive Model for In Situ Comminuted Silicon Carbide
Abstract:Cylindrical hot-pressed silicon carbide (SiC) ceramic targets were predamaged before ballistic testing. The SiC was thermally shocked to introduce noncontiguous cracks, then additional damage was induced by load–unload cycling in an MTS machine while the ceramic specimen was confined in a 7075-T6 aluminum sleeve. Long gold rod penetration was measured as a function of impact velocity vp over the approximate range of 1–3 km/s, with most data between 1.5 and 3 km/s. Penetration as a function of time was measured using multiple, independently timed flash X-rays. It was assumed that the penetration response of the damaged SiC could be represented by a Drucker–Prager constitutive model. Numerical simulations were used to estimate the constitutive constants. It was found that simulations could not be used to determine a unique set of constitutive constants within experimental data scatter.
Document Type: Research Article
Publication date: June 1, 2009