Predicting Residual Stress and Microstructural Equiaxed-to-Columnar Grain Transition in 304L Stainless Steel LENS Parts
Abstract not provided.
Publications
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Jump to search filtersModeling Physical Aging with The Simplified Potential Energy Clock Model
Abstract not provided.
Peridynamic Theory as a New Paradigm for Multiscale Modeling of Sintering
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.
Overview of Additive Manufacturing at SNL NM
Abstract not provided.
Consideration of Fluid Physics on the Residual Stress of a Single Track of Material
Abstract not provided.
Modeling the Effect of Inter-layer Time on the 3D Microstructure and Residual Stress in LENS Parts
Abstract not provided.
Thermal and Structural Part-Scale Modeling of the Metal Additive Manufacturing Process
Abstract not provided.
Part-Scale Thermal and Structural Modeling of the Additive Manufacturing Process
Abstract not provided.
Thermal and Structural Modeling of Laser Engineered Net Shape (LENS) Additive Manufacturing (AM)
Abstract not provided.
Investigating the Mechanics of Sylgard with Crushable Fillers
Abstract not provided.
Mechanical Behavior and Damage Mechanisms of Encapsulant-filled Elastomers
Abstract not provided.
Modeling a Newtonian Fluid with a Rate-Dependent, Von Mises Plasticity Model for Solid Mechanics Applications
This memo derives a particular use of a rate-dependent, perfectly plastic Von Mises Plasticity constitutive model that represents a Newtonian (or Bingham) fluid. Only two parameters are needed: the viscosity and bulk modulus to complete the model parameterization. Under certain deformations, the model exactly represents a Newtonian fluid. Under others, the model shear thins. A Newtonian fluid representation may be used in confined flow applications in which a fluid-solid interaction is desired but code coupling is not.
A Bi-Stable Micro Elastic Band
Abstract not provided.
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