Numerical simulations of pore isolation and competition in idealized micro-spall process

Abstract

The 'micro-spall' phenomenon is a variant of fragmentation processor spall fracture-that is traditionally discussed in context of solid materials (metals). However it concerns situations in which the medium is fully or partially melted-be it due to kinetic impact, detonation or laser loading. The phenomenon takes place at sub-micrometer and sub-microsecond scales making it inaccessible to direct experimental observation; so far, investigations have been restricted to observations of late time "post-mortem" fragments. In this context, it becomes a viable approach to apply analysis using numerical description for fluids. This work presents such an application for an idealized rapid uniaxial (one-dimensional) system expansion. Cavitation in the medium is represented by including vacuous pores or cavities with surface tension whose growth and interaction are traced in time. The simulations reveal two main regimes of pore growth regulated by a characteristic Weber number.

PArallel, Robust, Interface Simulator (PARIS)

“…For more details on the numerical method and its application in idealized micro-spall, see [33] and [34].…”

“…Consequently, the actual linking is ensured by another Makefile line: HYPRE_LIBS = -L$(HYPRE_DIR) -lHYPRE which is specified in the default Paris distribution. Note that the Hypre version used for the majority of Paris development has been 2.10.1; it has been tested for stability in serial and massively parallel runs [33]. In case of hypre-related problems, fallback to v. 2.10 is recommended for debugging.…”

“…It is an interesting option in cases where initial conditions depend strongly on a very precise interface geometry, e.g. Free Surface solutions of bubble dynamics [34,33] and initialisation takes time compared to computation (as in the curvature test case). Linking of this library is performed in the exact same fashion as in the case of Hypre.…”

PArallel, Robust, Interface Simulator (PARIS)

“…It is an interesting option in cases where initial conditions depend strongly on a very precise interface geometry, e.g. free-surface solutions of bubble dynamics [43,42], and more rarely when initialization requires a considerable amount of computational time compared to Paris simulation time (as in the curvature test case). Linking of this library is performed in the exact same fashion as in the case of Hypre.…”

“…For more details on the numerical method and its application in idealized microspalling, see [42] and [43]. This process is found in metals that under shock loading melt and where, with the reflection of the shock wave from the material free surface, cavities can nucleate, grow and merge.…”