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ASAS (Non-Linear) User Manual
Contents
A.3.2 OFFG and OFSK Commands ............................................................................. A-12
A.3.3 OFCO Command................................................................................................. A-13
A.3.4 Finite Element Description Sheets ...................................................................... A-14
A.4
References ............................................................................................................ A-136
Appendix - B Material Models ................................................................................................. B-1
B.1 Linear Elasticity ............................................................................................................ B-1
B.1.1 Isotropic Material .................................................................................................. B-1
B.1.2 Anisotropic Material .............................................................................................. B-1
B.1.3 Orthotropic Material .............................................................................................. B-1
B.1.4 Laminated Material for Shell Elements ................................................................. B-2
B.1.5 Woven Material ..................................................................................................... B-4
B.2 Non-Linear Elasticity .................................................................................................... B-5
B.2.1 Hyperelastic Material ............................................................................................ B-5
B.3 Plasticity ........................................................................................................................ B-6
B.3.1 Yield Criteria ......................................................................................................... B-6
B.3.1.1 Von Mises ...................................................................................................... B-6
B.3.1.2 Tresca ............................................................................................................. B-6
B.3.1.3 Ivanov ............................................................................................................ B-6
B.3.1.4 Mohr-Coulomb .............................................................................................. B-7
B.3.1.5 Drucker-Prager .............................................................................................. B-8
B.3.1.6 Stress Resultant Plasticity for Beams ............................................................ B-8
B.3.1.7 Coulomb Friction ........................................................................................... B-9
B.3.1.8 Tension Cut-off .............................................................................................. B-9
B.3.1.9 Inelastic Spring .............................................................................................. B-9
B.3.2 Hardening Rules .................................................................................................. B-10
B.3.2.1 Isotropic ....................................................................................................... B-10
B.3.2.2 Kinematic ..................................................................................................... B-11
B.3.2.3 Combined ..................................................................................................... B-11
B.3.3 Equivalent Strain ................................................................................................. B-12
B.4 CREEP ........................................................................................................................ B-12
B.4.1 In-Built Creep Laws ............................................................................................ B-13
B.4.2 User Supplied Creep Laws .................................................................................. B-14
B.5 Composite Failure ....................................................................................................... B-16
B.5.1 Lamina Failure Criteria ....................................................................................... B-16
B.5.2 Laminate Failure Criteria .................................................................................... B-20
B.5.3 Failure Laws ........................................................................................................ B-22
B.5.3.1 In-Built Failure Law .................................................................................... B-22
B.5.3.2 User-Defined Failure Laws.......................................................................... B-24
B.6 User Material............................................................................................................... B-26
B.7 References ................................................................................................................... B-31
Appendix - C Solution Strategies in ASAS-NL ....................................................................... C-1
C.1 Introduction ................................................................................................................... C-1
C.2 Incremental - Iterative Procedures ................................................................................ C-3
C.2.1 Introduction ........................................................................................................... C-3
C.2.2 Basic Definitions ................................................................................................... C-7
C.2.3 Incrementation procedures .................................................................................... C-8
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