Characterization of Spall in Hard-Rock From Observations and Simulations of the Source Physics Experiment Phase I

Date: 4/24/2019

Time: 06:00 PM

Room: Grand Ballroom

Spall signals from the Source Physics Experiments (SPE) are presented, analyzed, and modeled for insight to the explosion source. The observed signal is similar in nature to nearby historical nuclear explosions and the surface force-time history or velocity can be interpreted with the same model. We use the models for peak spall velocity, spalled mass, and spall depth and radius derived from historical nuclear explosions to parameterize the physical force-time history model from Stump [1985] and show that this parameterized model can be used for spall prediction. The spall signal is also investigated with a 3D numerical continuum model that incorporates gravity. Peak velocity and dwell time are well predicted but modeling the slap-down phase requires further work.

Prepared by LLNL under Contract DE-AC52-07NA27344.

Presenting Author: Sean R. Ford

Authors