Title: Three-Dimensional Characterization and Modeling of Microstructural Weak Links for Spall Damage in FCC Metals

Abstract

Local microstructural weak links for spall damage were investigated using three-dimensional (3-D) characterization in multicrystalline copper samples (grain size ≈ 450 µm) shocked with laser-driven plates at low pressures (2 to 4 GPa). The thickness of samples and flyer plates, approximately 1000 and 500 µm respectively, led to short pressure pulses that allowed isolating microstructure effects on local damage characteristics. Electron Backscattering Diffraction and optical microscopy were used to relate the presence, size, and shape of porosity to local microstructure. The experiments were complemented with 3-D finite element simulations of individual grain boundaries (GBs) that resulted in large damage volumes using crystal plasticity coupled with a void nucleation and growth model. Results from analysis of these damage sites show that the presence of a GB-affected zone, where strain concentration occurs next to a GB, correlates strongly with damage localization at these sites, most likely due to the inability of maintaining strain compatibility across these interfaces, with additional effects due to the inclination of the GB with respect to the shock. Results indicate that strain compatibility plays an important role on intergranular spall damage in metallic materials.

Authors:

Krishnan, Kapil ^[1]; Brown, Andrew ^[1]; Wayne, Leda ^[1]; Vo, Johnathan ^[1]; Opie, Saul ^[1]; Lim, Harn ^[1]; Peralta, Pedro ^[1]; Luo, Sheng-Nian ^[2]; Byler, Darrin ^[3]; McClellan, Kenneth J. ^[3]; Koskelo, Aaron ^[3]; Dickerson, Robert ^[3]

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+ Show Author Affiliations

1. Arizona State Univ., Tempe, AZ (United States). School for Engineering of Matter, Transport and Energy
2. Peac Inst. of Multiscale Sciences, Chengdu (China)
3. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

Publication Date:

Tue Nov 25 00:00:00 EST 2014

Research Org.:

Arizona State Univ., Tempe, AZ (United States); Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)

Sponsoring Org.:

USDOE National Nuclear Security Administration (NNSA)

OSTI Identifier:

1460721

Alternate Identifier(s):

OSTI ID: 1329573

Report Number(s):

DOE-ASU-02005-6; LA-UR-15-21228
Journal ID: ISSN 1073-5623; PII: 2667; TRN: US1901910

Grant/Contract Number:  

NA0002005; AC52-06NA25396; FG52-06NA26169; FG52-10NA29653

Resource Type:

Accepted Manuscript

Journal Name:

Metallurgical and Materials Transactions. A, Physical Metallurgy and Materials Science

Additional Journal Information:

Journal Volume: 46; Journal Issue: 10; Journal ID: ISSN 1073-5623

Publisher:

ASM International

Country of Publication:

United States

Language:

English

Subject:

36 MATERIALS SCIENCE; Spall damage; localization; crystal plasticity; modeling; GTN; Grain Boundaries; Plate Impact; Shock Waves; spall FCC shock