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Title: Peridynamic Theory as a New Paradigm for Multiscale Modeling of Sintering

Abstract

Sintering is a component fabrication process in which powder is compacted by pressing or some other means and then held at elevated temperature for a period of hours. The powder grains bond with each other, leading to the formation of a solid component with much lower porosity, and therefore higher density and higher strength, than the original powder compact. In this project, we investigated a new way of computationally modeling sintering at the length scale of grains. The model uses a high-fidelity, three-dimensional representation with a few hundred nodes per grain. The numerical model solves the peridynamic equations, in which nonlocal forces allow representation of the attraction, adhesion, and mass diffusion between grains. The deformation of the grains is represented through a viscoelastic material model. The project successfully demonstrated the use of this method to reproduce experimentally observed features of material behavior in sintering, including densification, the evolution of microstructure, and the occurrence of random defects in the sintered solid.

Authors:
 [1];  [1];  [1]
  1. Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Publication Date:
Research Org.:
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1395753
Report Number(s):
SAND-2017-10313R
657247
DOE Contract Number:  
AC04-94AL85000; NA0003525
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE

Citation Formats

Silling, Stewart A., Abdeljawad, Fadi, and Ford, Kurtis Ross. Peridynamic Theory as a New Paradigm for Multiscale Modeling of Sintering. United States: N. p., 2017. Web. doi:10.2172/1395753.
Silling, Stewart A., Abdeljawad, Fadi, & Ford, Kurtis Ross. Peridynamic Theory as a New Paradigm for Multiscale Modeling of Sintering. United States. doi:10.2172/1395753.
Silling, Stewart A., Abdeljawad, Fadi, and Ford, Kurtis Ross. Fri . "Peridynamic Theory as a New Paradigm for Multiscale Modeling of Sintering". United States. doi:10.2172/1395753. https://www.osti.gov/servlets/purl/1395753.
@article{osti_1395753,
title = {Peridynamic Theory as a New Paradigm for Multiscale Modeling of Sintering},
author = {Silling, Stewart A. and Abdeljawad, Fadi and Ford, Kurtis Ross},
abstractNote = {Sintering is a component fabrication process in which powder is compacted by pressing or some other means and then held at elevated temperature for a period of hours. The powder grains bond with each other, leading to the formation of a solid component with much lower porosity, and therefore higher density and higher strength, than the original powder compact. In this project, we investigated a new way of computationally modeling sintering at the length scale of grains. The model uses a high-fidelity, three-dimensional representation with a few hundred nodes per grain. The numerical model solves the peridynamic equations, in which nonlocal forces allow representation of the attraction, adhesion, and mass diffusion between grains. The deformation of the grains is represented through a viscoelastic material model. The project successfully demonstrated the use of this method to reproduce experimentally observed features of material behavior in sintering, including densification, the evolution of microstructure, and the occurrence of random defects in the sintered solid.},
doi = {10.2172/1395753},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2017},
month = {9}
}

Technical Report:

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