Lagrangian Material Tracers (LMT) for Simulating Material Damage in ALEGRA

Technical Report · Tue Jul 26 00:00:00 EDT 2016

DOI:https://doi.org/10.2172/1561806· OSTI ID:1561806

Sanchez, Jason James ^[1]; Luchini, Christopher Bernard ^[1]; Strack, Otto Eric ^[1]

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

A method for providing non-diffuse transport of material quantities in arbitrary Lagrangian-Eulerian (ALE) dynamic solid mechanics computations is presented. ALE computations are highly desirable for simulating dynamic problems that incorporate multiple materials and large deformations. Despite the advantages of using ALE for such problems, the method is associated with diffusion of material quantities due to the advection transport step of the computational cycle. This drawback poses great difficulty for applications of material failure for which discrete features are important, but are smeared out as a result of the diffusive advection operation. The focus of this work is an ALE method that incorporates transport of variables on discrete, massless points that move with the velocity field, referred to as Lagrangian material tracers (LMT), and consequently prevents diffusion of certain material quantities of interest. A detailed description of the algorithm is provided along with discussion of its computational aspects. Simulation results include a simple proof of concept, verification using a manufactured solution, and fragmentation of a uniformly loaded thin ring that clearly demonstrates the improvement offered by the ALE LMT method.

• Research Organization: Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
• Sponsoring Organization: USDOE National Nuclear Security Administration (NNSA)
• DOE Contract Number: AC04-94AL85000
• OSTI ID: 1561806
• Report Number(s): SAND-2016-7260; 646197
• Country of Publication: United States
• Language: English