Innovative Solutions for Modeling a Rate Activated Tether Using LS DYNA

Abstract

As part of the Head Health Challenge Program, a protection concept using a rate-activated tether containing shear-thickening fluid (STF) is studied. The tether is intended to reduce the impact force experienced by a person wearing a helmet and subjected to blunt force due to a head strike against a hard surface. The tether assembly containing the STF, and designed to have a loading rate sensitivity, is modeled in LS-DYNA, a commercial explicit finite element code developed by Livermore Software Technology Corporation. Two innovative methods to model the tether are described in detail. The first method demonstrates the innovative use of MAT_PLASTICITY_POLYMER and the second method demonstrates the use of the keywords DEFINE_CURVE_FUNCTION and DEFINE_FUNCTION. This report provides inexperienced users with finite element modeling information on how to model complex systems using much less complex methods than would be indicated by the physics of the system.

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Document Details

Document Type
Technical Report
Publication Date
Jul 31, 2018
Accession Number
AD1057385

Entities

People

  • Daniel Malone
  • Dmitriy Krayterman

Organizations

  • United States Army Research Laboratory

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  • Biomedical
  • Cyber

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  • Calcium Compounds
  • Complex Systems
  • Computer Programming
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  • Department Of Defense
  • Elements
  • Experimental Data
  • Fluid Dynamics
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  • Particles
  • Plastic Properties
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  • Computational Fluid Dynamics (CFD)
  • Electrical Engineering
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