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Structural mechanics
Structural mechanics

Simulating the Plastic Material Behavior of Metals


Training Expert

Learn more about the realistic modeling of material behavior in metals and typical components of plastic strength analyses. This training is offered as a 2-day course.

2 days

Basic knowledge of Ansys Mechanical

Software used
Ansys Mechanical

  • An insight into the key material models for metals in Ansys
  • Preparation of experimental data and the load scenarios in which different model combinations are used
  • Improving model troubleshooting and convergence behavior
  • Reliably selecting suitable plastic material models


Due to their crystalline structure, metals demonstrate effects such as permanent deformations that cannot be described by a linear-elastic law. The dependency of the stress level on the deformation history and the loading velocity is often particularly pronounced, such that non-linear material models are necessary to determine the plastic reserves of the metals. Plastic reserve can be understood as the difference between a load and the first occurrence of plasticity, or identification for the introduction of a plastic area under cyclical loads. Many guidelines concerning strength, such as the Eurocode or FKM, require analysis of the plastic material behavior.

As part of the training, you will receive a thorough insight into the most important material models for metals in Ansys. In addition to an understanding of the terms relating to rate-independent and rate-dependent plasticity, you will also learn how experimental data are prepared and in which load scenarios different model combinations are used. Practical computer-based exercises will help you to carry out model troubleshooting and to improve the convergence behavior of physical non-linear problems. As a simulation engineer, you will have a solid basis for selecting suitable plastic material models that you can apply successfully and independently to your own tasks or carry out simulation-based plastic strength verification.

Detailed agenda for this 2-day training

Day 1

01 Overview of the world of metals

  • From elastic to plastic material behavior
  • Workshop: Plastic load bearing reserve of a steel girder
  • The impact of metal properties, temperature, and load speed
  • Typical stress-strain distribution based on the measurement
  • True stress and strain – technical variables
  • Ansys-compliant computation of stress and strain based on measurement data

02 Reproducing the plastic material behavior in the FE model

  • When does a metal begin to yield?
  • Yield function, yield criteria, load and unloading conditions
  • Development of the yield surface as a function of the plastic strain
  • Isotropic plasticity in accordance with von Mises and anisotropic plasticity in accordance with Hill
  • Workshop: Plastic results variables and their significance using a tensile specimen as an example

03 Ansys material models for monotonic loads

  • Rate-independent models with isotropic hardening
  • Bilinear (BiSO), multilinear (MISO), and non-linear (NLISO: POWER, VOCE)
  • Defining materials laws in the Ansys Mechanical materials library
  • The APDL path within Ansys Mechanical for special materials laws
  • Determining materials parameters with non-linear hardening
  • Workshop: Virtual tensile testing – comparison of isotropic hardening models
  • Workshop: Evaluation of static component failure based on FKM NL

04 Ansys material models for a cyclical load

  • Rate-independent models with kinematic hardening
  • Bilinear (BKIN), multilinear (KINH), and non-linear (Chaboche)
  • The Bauschinger effect, reverse stress, and kinematic links
  • Ratcheting and shakedown with an asymmetrical load
  • Example: Virtual tensile testing – comparison of kinematic hardening models
  • Workshop: A plate under cyclical load with Chaboche, including curve fit and comparison with multilinear kinematic hardening

Day 2

05 Combinations of kinematic and isotropic hardening

  • Hystereses with force and displacement control
  • Cyclical hardening and softening
  • Monotone in comparison with a cyclical stress-strain curve
  • Estimate stress-strain characteristics via the Ramberg-Osgood equation
  • Non-linear analysis settings
  • Workshop: Curve fit for combined hardening (Voce, Chaboche)
  • Workshop: Cyclical analysis of a ring container

06 Influence of the rate dependency in short time periods

  • Viscoplastic models in Ansys Mechanical (Peirce, Perzyna, Anand)
  • Mapping the strain rate sensitivity in an FE model
  • The difference between explicit and implicit solution methods
  • Short-term strength in accordance with the energy concept
  • Workshop: Bearable number of cycles of an electronic component (Anand model with energy-based criterion)

07 Time-dependent behavior with constant load and high temperature

  • The creep phenomenon
  • The differences between primary, secondary, and tertiary creep
  • Influencing factors on creep behavior (stress, creep strain rate, temperature)
  • Strain-explicit and time-explicit approaches
  • Preparing experimental creep curves (information on successful curve fit)
  • Workshop: Curve fit for secondary creep
  • Workshop: Simulating an exhaust manifold under temperature load

08 Special effects with metals

  • Push-pull asymmetry in the plastic range (cast iron)
  • Example: Virtual tensile test – cast iron model
  • Static crystal regeneration of isotropic and kinematic hardening
  • Workshop: Tensile tube sample – integration of kinematic static recovery in the Chaboche model
  • Phenomenological damage development in accordance with Gurson Tvergaard Needleman (GTN)
  • Example: Virtual tensile testing – new formation, growth, and merging of pores in a GTN model

Your Trainers

Dr.-Ing. Rumena Tsotsova
CAE Engineer, CADFEM Germany GmbH, Grafing
Dr. sc. ETH Manfred Maurer
Engineering Services, CADFEM (Suisse) AG, Aadorf
Dr. sc. Jörg Helfenstein
Head of Seminars, CADFEM (Suisse) AG, Aadorf
Moritz Strummer
CAE Engineer, CADFEM (Austria) GmbH, Wien
Bernard Feuillard
Engineering Services, CADFEM (Suisse) AG, Renens

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Straight after you sign up, an automatic confirmation of receipt will be sent to the email addresses you provided. Once you have successfully verified the data you provided, you will receive your personalized sign-up confirmation, containing further information on course fees, the billing address, etc., by email within two to three working days.  

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If the minimum number of attendees is not reached, we reserve the right to cancel the training seven days before it is due to start at the latest. We are happy to inform you on changing your booking to an alternative date. Please note that we accept no liability for hotel or travel bookings that attendees have already made.

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