Peridynamic Theory as a New Paradigm for Multiscale Modeling of Sintering

Technical Report · 01 September 2017

DOI:https://doi.org/10.2172/1395753· OSTI ID:1395753

Silling, Stewart A. ^[1]; Abdeljawad, Fadi ^[1]; Ford, Kurtis Ross ^[1]

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1. Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)

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.

• Research Organization: Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States)
• Sponsoring Organization: USDOE National Nuclear Security Administration (NNSA)
• DOE Contract Number: AC04-94AL85000; NA0003525
• OSTI ID: 1395753
• Report Number(s): SAND-2017-10313R; 657247
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE