An anisotropic damage model based on dislocation-mediated nucleation of cracks under high-rate compression

doi:10.1016/j.jmps.2019.103818

This content will become publicly available on December 13, 2020

Title: An anisotropic damage model based on dislocation-mediated nucleation of cracks under high-rate compression

Full Record
Other Related Research

Abstract

In this report, we developed a thermodynamically-consistent, rate-dependent micromechanics model for brittle damage nucleated by dislocation plasticity applicable for large deformations. Dislocation substructure evolution was used to inform a nucleation criterion for a microcrack. Under global compression, the sliding of a microcrack induces formation of wing cracks. Effective stress drives dynamic growth of these cracks under a 3D stress state, resulting in an anisotropic material stiffness. The model was also advanced to predict grain size dependence of a polycrystalline solid. Internal variables were constrained based on the laws of thermodynamics. Material constants were calibrated for polycrystalline beryllium to demonstrate the applicability of the model to simulate dynamic failure under compression. We demonstrate the versatility of the model to capture brittle to ductile transition governed by temperature and strain rate. The predictive capability of the model to simulate failure stress and failure strain is compared with dynamic and quasistatic data on beryllium.

Authors:

^[1];

^[1]

Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

Publication Date:: 2019-12-13

Research Org.:: Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

Sponsoring Org.:: USDOE National Nuclear Security Administration (NNSA)

OSTI Identifier:: 1581276

Alternate Identifier(s):: OSTI ID: 1580118

Report Number(s):: LA-UR-19-25002
Journal ID: ISSN 0022-5096

Grant/Contract Number:: 89233218CNA000001

Resource Type:: Accepted Manuscript

Journal Name:: Journal of the Mechanics and Physics of Solids

Additional Journal Information:: Journal Volume: 137; Journal Issue: C; Journal ID: ISSN 0022-5096

Publisher:: Elsevier

Country of Publication:: United States

Language:: English

Subject:: 36 MATERIALS SCIENCE; HCP; fracture; cracks; kinetics; damage; viscoplastic

Citation Formats


                    Daphalapurkar, Nitin P., Luscher, Darby J., Versino, Daniele, Margolin, Len, and Hunter, Abigail. An anisotropic damage model based on dislocation-mediated nucleation of cracks under high-rate compression.  United States: N. p., 2019. 
        Web.  doi:10.1016/j.jmps.2019.103818.

Copy to clipboard


                    Daphalapurkar, Nitin P., Luscher, Darby J., Versino, Daniele, Margolin, Len, & Hunter, Abigail. An anisotropic damage model based on dislocation-mediated nucleation of cracks under high-rate compression.  United States.  doi:10.1016/j.jmps.2019.103818.

Copy to clipboard


                    Daphalapurkar, Nitin P., Luscher, Darby J., Versino, Daniele, Margolin, Len, and Hunter, Abigail. Fri .  
        "An anisotropic damage model based on dislocation-mediated nucleation of cracks under high-rate compression".  United States.  doi:10.1016/j.jmps.2019.103818.

Copy to clipboard


                    
@article{osti_1581276,

  title        = {An anisotropic damage model based on dislocation-mediated nucleation of cracks under high-rate compression},

  author       = {Daphalapurkar, Nitin P. and Luscher, Darby J. and Versino, Daniele and Margolin, Len and Hunter, Abigail},

  abstractNote = {In this report, we developed a thermodynamically-consistent, rate-dependent micromechanics model for brittle damage nucleated by dislocation plasticity applicable for large deformations. Dislocation substructure evolution was used to inform a nucleation criterion for a microcrack. Under global compression, the sliding of a microcrack induces formation of wing cracks. Effective stress drives dynamic growth of these cracks under a 3D stress state, resulting in an anisotropic material stiffness. The model was also advanced to predict grain size dependence of a polycrystalline solid. Internal variables were constrained based on the laws of thermodynamics. Material constants were calibrated for polycrystalline beryllium to demonstrate the applicability of the model to simulate dynamic failure under compression. We demonstrate the versatility of the model to capture brittle to ductile transition governed by temperature and strain rate. The predictive capability of the model to simulate failure stress and failure strain is compared with dynamic and quasistatic data on beryllium.},

  doi          = {10.1016/j.jmps.2019.103818},

  journal      = {Journal of the Mechanics and Physics of Solids},

  number       = C,

  volume       = 137,

  place        = {United States},

  year         = {2019},

  month        = {12}

}

Copy to clipboard

Journal Article:

Free Publicly Available Full Text

This content will become publicly available on December 13, 2020

Publisher's Version of Record

DOI: 10.1016/j.jmps.2019.103818

Other availability

Search WorldCat to find libraries that may hold this journal

Save / Share:

Export Metadata

Save to My Library

Similar records in OSTI.GOV collections:

Strain-rate effect on brittle failure in compression

Journal Article Nemat-Nasser, S. ; Deng, H. - Acta Metallurgica et Materialia; (United States)

A simple model of an array of interacting, dynamically growing wing cracks is used to simulate the rate-dependent dynamic damage evolution and subsequent brittle failure of solids under compression. The validity of the model is discussed. Parameters which identify the overall failure by the coalescence of compression-induced, interacting, tensile microcracks are calculated in closed form, and relations between microstructure and the corresponding rate dependency of the overall response are examined in some detail. It is shown that the experimentally observed change in the compressive failure stress with increasing strain rate, may be considered to be a consequence of the generationmore »« less
DOI: 10.1016/0956-7151(94)90295-X
Microstructural Origins of Dynamic Fracture in Ductile Metals

Technical Report Belak, J ; Cazamias, J U ; Fivel, M ; ...

Dynamic fracture is a material failure process at high strain-rates. Here, we limit our discussion to spallation fracture during shock wave loading. When a compressive shock wave reflects from a free surface, internal states of tension are created. If this tension exceeds the rupture strength of the material, it fails by nucleating and growing microscopic voids in ductile metals and cracks in brittle solids. This effect, known as spallation, was reported by Hopkinson in 1872 [1]. Rinehart and Pierson [2] give an historical introduction to spallation and other aspects of high strain-rate deformation. This phenomenology of the nucleation and growthmore »« less
DOI: 10.2172/15013632

Full Text Available
Time-dependent damage and creep of brittle rock

Conference Costin, L.S.

Results of a combined analytical-experimental study of the relationship between subcritical microcrack growth due to stress corrosion and the time-dependent deformation and failure of brittle rock are reported. An analysis of creep and failure under uniaxial stress was performed using a continuum damage model. The model includes evolutionary equations which describe the growth of microcracks due to stress corrosion as well as incremental increases in applied stress. Also, the effect of interaction between neighboring cracks on the rate of crack growth is included. The model was used to predict the relationship between strain rate and failure stress for uniaxial compressionmore »« less
Fracture and Healing of Rock Salt Related to Salt Caverns

Conference Chan, K.S. ; Fossum, A.F. ; Munson, D.E.

In recent years, serious investigations of potential extension of the useful life of older caverns or of the use of abandoned caverns for waste disposal have been of interest to the technical community. All of the potential applications depend upon understanding the reamer in which older caverns and sealing systems can fail. Such an understanding will require a more detailed knowledge of the fracture of salt than has been necessary to date. Fortunately, the knowledge of the fracture and healing of salt has made significant advances in the last decade, and is in a position to yield meaningful insights tomore »« less
Full Text Available
Effect of strain rate on plastic flow and failure in polycrystalline tungsten

Journal Article Duemmer, T. ; LaSalvia, J.C. ; Ravichandran, G. ; ... - Acta Materialia

Polycrystalline tungsten (less than 100 p.p.m. impurities) was subjected to different heat treatments to yield different grain morphologies and tested at quasi-static (3 {times} 10{sup {minus}3}) and dynamic (10{sup 3}--4 {times} 10{sup 3}/s) strain rates. Three mechanisms of deformation were identified and evaluated: slip, twinning, and intergranular cracking. Whereas plastic flow by slip has considerable strain-rate sensitivity in tungsten (which is found to be well represented by the Mechanical Threshold Stress constitutive equation) the cohesive strength of the grain boundaries was found to decrease with heat treatment temperature, but was insensitive to strain-rate changes. Low-strain-rate deformation yielded limited damage atmore »« less
DOI: 10.1016/S1359-6454(98)00255-9

Similar Records