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Title: A physics-based model and simple scaling law to predict the pressure dependence of single crystal spall strength

Journal Article · · Journal of the Mechanics and Physics of Solids
 [1];  [2];  [1]
  1. Texas A & M Univ., College Station, TX (United States)
  2. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

A homogenized framework for ductile damage accounting for the effect of void growth on the thermomechanical response of single crystals under dynamic loading (CPD-FE) is developed here. The current framework extends our prior work (Nguyen et al., 2017) by incorporating the yield function of Han et al. (2013) for porous single crystals to govern the degradation of the macroscopic critical resolved shear stress. Validation of the model against direct numerical simulations shows a significant improvement in accuracy under conditions of macroscopic shear loading. The model parameters are calibrated to Kolsky bar (split-Hopkinson pressure bar) and plate impact experiments, and utilized to predict spall strength of single crystal copper in ⟨100⟩ orientation. Simulation results show favorable agreement with single crystal plate impact tests over a range of strain rates and shock compression pressures. These simulation results are used to further interpret previous experimental observations on the rate and pressure sensitivity of spallation. Lastly, a simple analytical model for spall strength depending on the temperature, strain rate and pressure is proposed, which shows agreement with molecular dynamics (MD) simulations and experimental results. This analytical model of spall strength concisely captures the physical mechanisms governing the effects of pressure, strain rate, and temperature on spall strength.

Research Organization:
Los Alamos National Laboratory (LANL)
Sponsoring Organization:
Army Research Laboratory (ARL); USDOE; USDOE National Nuclear Security Administration (NNSA), Office of Defense Programs (DP) (NA-10)
Grant/Contract Number:
89233218CNA000001; AC52-06NA25396
OSTI ID:
1595654
Report Number(s):
LA-UR--19-26276
Journal Information:
Journal of the Mechanics and Physics of Solids, Journal Name: Journal of the Mechanics and Physics of Solids Journal Issue: C Vol. 137; ISSN 0022-5096
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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