@inproceedings{c37cd52b90f34a19917630c1704068d2,
title = "Calibration of macroscopic impact ignition model from simulation of shear band formation on the mesoscale",
abstract = "Relying on test results in [1] we proposed in [2] a macroscopic impact ignition model in terms of the product PD (P=pressure, D=plastic deformation rate). Here we upgrade this model by taking into account the time duration to ignition for different PD levels. Our macroscopic impact ignition model is now based on, and calibrated from, 1D simulations of pure torsion on the mesoscale. We assume that impact ignition is invoked by shear localization and formation of shear bands. We denote by (PD)L the macroscopic shear localization threshold. When PD>(PD)L in a macroscopic cell, shear bands start to form there. The shear bands then develop and heat up towards the ignition temperature. We further assume that the time duration from localization to ignition h=tig-tL also depends on PD. Using 1D simulations of shear band formation in torsion, similar to [3], we calibrate 1) the plastic flow curve coefficient Aγ (see later) from the localization threshold (PD)L determined from tests; and 2) the delay to ignition h(PD). We can then use these in macroscopic hydrocode simulations. Our mesoscale simulations depend on a realistic strength model for explosives. This model employs the overstress approach to dynamic viscoplasticity [4], and its main feature here is the pressure dependence of its plastic flow curve coefficient.",
author = "Yehuda Partom and Erez Hanina",
note = "Publisher Copyright: {\textcopyright} 2018 Author(s).; 20th Biennial American Physical Society Conference on Shock Compression of Condensed Matter, SCCM 2017 ; Conference date: 09-07-2017 Through 14-07-2017",
year = "2018",
month = jul,
day = "3",
doi = "10.1063/1.5044987",
language = "English",
series = "AIP Conference Proceedings",
publisher = "American Institute of Physics Inc.",
editor = "Knudson, {Marcus D.} and Brown, {Eric N.} and Ricky Chau and Germann, {Timothy C.} and Lane, {J. Matthew D.} and Eggert, {Jon H.}",
booktitle = "Shock Compression of Condensed Matter - 2017",
}