58301215-User-Subroutines-l6-Umat - ABAQUS Lecture 6...

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7/01 Writing User Subroutines with ABAQUS L6.1 ABAQUS Lecture 6 Writing a UMAT or VUMAT Overview • Motivation • Steps Required in Writing a UMAT or VUMAT • UMAT Interface • Examples • VUMAT Interface • Examples
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7/01 Overview Writing User Subroutines with ABAQUS L6.2 ABAQUS Overview • ABAQUS/Standard and ABAQUS/Explicit have interfaces that allow the user to implement general constitutive equations. – In ABAQUS/Standard the user-defined material model is implemented in user subroutine UMAT . – In ABAQUS/Explicit the user-defined material model is implemented in user subroutine VUMAT . • Use UMAT and VUMAT when none of the existing material models included in the ABAQUS material library accurately represents the behavior of the material to be modeled.
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7/01 Overview Writing User Subroutines with ABAQUS L6.3 ABAQUS • These interfaces make it possible to define any (proprietary) constitutive model of arbitrary complexity. • User-defined material models can be used with any ABAQUS structural element type. • Multiple user materials can be implemented in a single UMAT or VUMAT routine and can be used together. In this lecture the implementation of material models in UMAT or VUMAT will be discussed and illustrated with a number of examples.
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7/01 Motivation Writing User Subroutines with ABAQUS L6.4 ABAQUS Motivation • Proper testing of advanced constitutive models to simulate experimental results often requires complex finite element models. – Advanced structural elements – Complex loading conditions – Thermomechanical loading – Contact and friction conditions – Static and dynamic analysis
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7/01 Motivation Writing User Subroutines with ABAQUS L6.5 ABAQUS • Special analysis problems occur if the constitutive model simulates material instabilities and localization phenomena. – Special solution techniques are required for quasi-static analysis. – Robust element formulations should be available. – Explicit dynamic solution algorithms with robust, vectorized contact algorithms are desired. • In addition, robust features are required to present and visualize the results. – Contour and path plots of state variables. X–Y plots. – Tabulated results.
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7/01 Motivation Writing User Subroutines with ABAQUS L6.6 ABAQUS • The material model developer should be concerned only with the development of the material model and not the development and maintenance of the FE software. – Developments unrelated to material modeling – Porting problems with new systems – Long-term program maintenance of user-developed code
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7/01 Motivation Writing User Subroutines with ABAQUS L6.7 ABAQUS •“ Finite Element Modelling of the Damage Process in Ice ,” R. F. McKenna, I. J. Jordaan, and J. Xiao, ABAQUS Users’ Conference Proceedings, 1990.
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7/01 Motivation Writing User Subroutines with ABAQUS L6.8 ABAQUS •“ The Numerical Simulation of Excavations in Deep Level Mining ,” M. F. Snyman, G. P. Mitchell, and J. B. Martin, ABAQUS Users’ Conference Proceedings, 1991.
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7/01 Motivation
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This note was uploaded on 01/27/2012 for the course ECON 101 taught by Professor Abba during the Spring '11 term at Dominican School of Philosophy and Theology.

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58301215-User-Subroutines-l6-Umat - ABAQUS Lecture 6...

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