Practical Simulation of Elastomer Components
From Shore hardness to the Mullins effect
In this training, you will learn how to select and fit appropriate material models as well as to model reinforcements and confined fluids. This training is offered as a 2-day course.
Duration
2 days
Prerequisites
Basic knowledge of Ansys Mechanical
Software used
Ansys Mechanical
- You select the right material model for your application
- Assign the right measurements and adapt material models
- Increase robustness and accuracy through adaptive remeshing
- Efficiently simulate confined fluids and fiber reinforcements
Description
O-rings, valves, diaphragms, bearings: many products in mechanical and automotive engineering, aerospace technology and medical technology would be inconceivable without the large, reversible deformability and good dampening properties of elastomers.
In the training course, you will learn how to select suitable materials models for the simulation of static behavior (hyperelasticity), dynamic behavior (viscoelasticity) and damage to elastomers (Mullins effect). We will provide you with the necessary knowledge to assign the right measurements and to adapt your chosen model with the help of the measurement results. This way you will improve the robustness and accuracy of your Ansys analysis for components. Knowledge of efficient simulation of confined fluids and fiber-reinforced elastomer components rounds off this multifaceted course.
This training course is aimed at computational engineers and designers who want to know more about the simulation of elastomers.
Detailed agenda for this 2-day training
Day 1
01 Simulation of elastomer components
- Properties of elastomers
- Overview of available material models
- Simulation methodology for elastomer components
- Correct evaluation of large strains
- Demonstrator: calculation of the characteristic curve of an air spring
- Workshop: compression of an O-ring
02 Hyperelastic material models
- Fundamentals of continuum mechanics
- Strain energy functions: Neo Hooke, Mooney-Rivlin, Yeoh, Ogden and others
- Optimal element settings at volume constancy (u-p formulation)
- Workshop: Convergence analysis on a keyboard stroke
03 Viscoelastic effects
- Fundamentals of the Prony series
- Time domain: relaxation
- Frequency domain: dynamic hardening
- Time-temperature shift principle: WLF and TN shift function
- Workshop: stress relaxation in a press fit
04 Systematic material characterization
- Estimation of the shear modulus from the Shore hardness and example parameter sets
- Derivation of component-oriented test conditions with the invariant diagram
- Standard tests for hyperelastic and viscoelastic materials
- Curve-fitting in Ansys Workbench
- Workshop 1: fitting hyperelastic models to test data with Ansys Workbench
- Workshop 2: fitting of Prony series to relaxation tests with Ansys Workbench
Day 2
05 Damage and cyclic material behavior
- Phenomenology: damage (Mullins effect) and cyclic stress-strain behavior (nonlinear viscoelasticity) of elastomers
- Ogden-Roxburgh model (Mullins effect)
- Bergström-Boyce model (nonlinear viscoelasticity)
- Demonstrator: parameter identification of the Ogden-Roxburgh model with Ansys optiSLang
- Workshop: Cyclic torsion of a suspension bushing with the Bergström-Boyce model
06 Modeling of fiber reinforced elastomers
- Short fiber reinforcement: anisotropic hyperelasticity using structural tensors
- Continuous fiber reinforcement: Reinforce elements (REINF)
- Workshop: maximum transmittable moment of a V-belt
07 Modeling of confined fluids
- Examples of fluid-structure interactions
- Hydrostatic fluid elements (HSFLD)
- Fluid models: incompressible and compressible fluids, ideal gases
- Definition in Ansys Mechanical and postprocessing
- Workshop: dependence of the stiffness of a rubber ball on air pressure
08 Adaptive Remeshing (NLAD)
- Procedure of an analysis with remeshing
- Criteria: when to remesh?
- Settings: how is remeshing done?
- Recommended remeshing settings
- Workshop: remeshing of an O-ring under operating load
Your Trainers
Dr.-Ing. Hendrik Donner
Prof. Dr.-Ing. Armin Fritsch
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