ANSYS AUTODYN-Material Models

Material Models in Explicit Dynamics (ANSYS)

AUTODYN Material Models

?An AUTODYN material model consists of 3 components

–Equation of State (EOS)

–Strength Model

–Failure Model

Models Also Available in Explicit Dynamics (ANSYS)

AUTODYN Additional Material Models

?Ideal Gas Equation of State

?Two Phase Equation of State

?SESAME Tables

?Cumulative Damage Model

?Beam Resistance Model

?Fragment Analyzer

?Rigid Materials (specification is different in AUTODYN)

?Orthotropic Materials

–Orthotropic Solids

–Composite Shells

?High Explosives (HE)

–Detonation

–Expansion of detonation products (gases)

–After-burn

–Ignition and Growth

?Slow-burning Explosives

?User Material Models

Ideal Gas Equation of State

Two Phase Equation of State

?Used to model the expansion and vaporization of superheated liquids

–e.g. a reactor coolant

?Used together with a compression EOS

?A Gruneisen EOS is used for the single phase region

–Saturation curve is the reference curve

?The saturation curve for the material is defined in user subroutine EXTAB

–The saturation curve for water is provided with AUTODYN

Sesame Library

?The Sesame library is not an EOS but a table format for storing state data

–Contains data for over 200 materials including metals, minerals, polymers and mixtures

–Most of the tables have data for very wide ranges of density and internal energy, but were

developed for particular applications where a particular range was required

–Use with caution

?The Sesame Library is US export-controlled

–Not included in standard distribution

–Library can be obtained from ANSYS if required permissions are provided

–Can also be obtained directly from LANL

Cumulative Damage Failure Model

?Allows progressive degradation of the strength of a material

?Early model developed to represent brittle materials under crushing

–Predates the Johnson-Holmquist Model

?First developed using User Subroutines

–Good example of the effective combination of multiple user subroutines

Beam Resistance Model

?Strength data for the beam-resistance model is defined using four 10 point piecewise linear

curves

http://www.cadfamily.com/html/Article/ANSYS%20AUTODYN-Material%20Models_639_1.htm
http://www.cadfamily.com/html/Article/ANSYS%20AUTODYN-Material%20Models_639_2.htm

http://www.cadfamily.com/html/Article/ANSYS%20AUTODYN-Material%20Models_639_3.htm

http://www.cadfamily.com/html/Article/ANSYS%20AUTODYN-Material%20Models_639_4.htm

http://www.cadfamily.com/html/Article/ANSYS%20AUTODYN-Material%20Models_639_5.htm