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Innovative Solutions for Modeling a Rate Activated Tether Using LS DYNA

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Technical Report,01 Feb 2017,31 Aug 2017

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US Army Research Laboratory Aberdeen Proving Ground United States

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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 MATPLASTICITYPOLYMER and the second method demonstrates the use of the keywords DEFINECURVEFUNCTION and DEFINEFUNCTION. 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.

Subject Categories:

  • Protective Equipment

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