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Structural mechanics
Structural mechanics

Effectively Simulating Seals with a Pragmatic Relevance

Overview

Training Expert

Robust computation of the penetration of pressurized fluid into the seal area, through to extrusion This training is offered as a 2-day course.

Duration
2 days

Prerequisites
Basic knowledge of Ansys Mechanical

Software used
Ansys Mechanical

Benefits
  • Proven practical knowledge for correct simulation of seals
  • The goal is to learn contact modeling and solution control
  • Analyzing installation conditions and operating loads effectively
  • Formulating reliable conclusions about sealing systems in the initial design phase

Description

Compared to the costs for entire assemblies or systems, the costs of seals are low. Yet watertightness plays a central role in many fields of application. The failure of a seal is generally associated with high resulting costs. Since preliminary tests for watertightness are not always possible or may be extremely expensive, the reliable simulation of sealing systems plays an important role in the product development process.

Benefit from our proven practical knowledge for correct simulation of seals. The training course starts with the fundamentals of non-linear structural mechanics and covers everything through to selection and definition of suitable material laws for seals. Acquire the knowledge that you need for contact modeling and solution controls to enable you to analyze assembly conditions and operating loads effectively. Use trained workflows independently to tackle complex load scenarios, from the penetration of a pressurized fluid into the seal area to extrusion.

The training is aimed at all engineers working with sealing applications who need to formulate reliable conclusions on the function of sealing systems in the early design phase or who need to analyze damage and develop improvements.

Detailed agenda for this 2-day training

Day 1

01 Simulation of gaskets

  • Technology: Applications and properties
  • Defining the Gasket characteristic curves
  • Preparing measurement data: Pressure vs.Closure
  • Inputting material data: Compression, unloadings
  • FE analysis of flat seals: Test model
  • Tips for model building
  • Evaluation: Pressure distribution, closure
  • Gasket creep effects: Presentation of a material model and its practical application

02 Workshop: gasket in pressure vessel flange

  • Mounting, load cycle, and impermeability evaluation
  • Checking for tightness class L0.1 and prestress loss

03 Simulation of hyperelastic seals – material models

  • Principles and material models for elastomers (rubber)
  • Hyperelasticity – formulation and selection aid
  • Determining hyperelastic materials parameters
  • Test types, data preparation, and curve fitting
  • Workshop: Curve fitting on Mooney Rivlin models
  • Approximation method – what to do when no material tests are available
  • Damage model in accordance with Mullins
  • Materials data examples
  • Materials databases
  • Literature proposals

04 Simulation of hyperelastic seals – FE analysis

  • Modeling
  • 2D Plane Strain vs. 3D volume model
  • Element types and mesh technique
  • A contact body as a rigid body
  • Solution controls
  • Linear statics – non-linear statics
  • The causes of non-linearities
  • The solution to non-linear problems
  • Observing convergence behavior
  • Solution control in Workbench

Day 2

05 Contact status calculation on seal surfaces

  • Robust contact setup for sealing tasks
  • Verifying results and results evaluation
  • Workshop: Butterfly seal
  • Installation in a sealing groove
  • Applying 10 bar operating pressure:
  • Interpreting the results

06 True state of assembled seals

  • Installation problems: Extreme contact penetration
  • Deactivating friction
  • Contact type variation
  • User-defined contact surface normal
  • FKN contact stiffness variation after installation
  • FKN contact stiffness variation during installation
  • Seal installation and operating pressure
  • Workshop: Butterfly seal under 10 bar operating pressure
  • Workshop: Installing a radial shaft sealing ring

07 Leakage test – fluid pressure penetration

  • How does Contact Fluid Pressure Penetration (CFPP or FPP) work?’
  • The FPP effect using damage to an O-ring step seal as an example
  • FPP contact settings
  • Applying operating pressure
  • Evaluation of results: Fluid pressure distribution
  • Workshop: Permeability check of a butterfly seal at 10 bar operating pressure

08 Automatic mesh refinement for analyzing extreme load conditions for seals

  • Non-linear adaptive region (NLADaptive)
  • Criteria for remeshes
  • Setting options and procedures
  • Monitoring
  • Limitations/recommendations
  • Workshop: Butterfly seal under 50 bar operating pressure – 2D axial-symmetrical model
  • Demonstration of a 3D volume model

Your Trainers

Ulrich Barthold
CAE Engineer, CADFEM Germany GmbH, Stuttgart
Dr. sc. Jörg Helfenstein
Head of Seminars, CADFEM (Suisse) AG, Aadorf
Dario Rüegg
Engineering Services, CADFEM (Suisse) AG, Aadorf
Bernard Feuillard
Engineering Services, CADFEM (Suisse) AG, Renens

Placement in the CADFEM Learning Pathway

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What CADFEM customers are saying

Tobias Gehring
Constructing Engineer, EAO Automotive GmbH & Co. KG

The training course 'Simulating seals effectively and practically' was excellent! Thank you for the many practical tips that I can now apply to my tasks.

Do you have questions on the training?

When will I receive the final confirmation for my training booking?

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.  

As soon as the minimum number of attendees has been reached, you will receive a final training confirmation containing further information. If you have booked an on-site training, we recommend that you wait until you have received this final confirmation before booking your travel and accommodation.

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.

When is the sign-up deadline for a training?

Training places will generally be allocated based on the order in which attendees sign up. For this reason, we always recommend booking for your desired date as early as possible.

As long as a coures still has free places, it can be booked.

At what time do the training courses begin and end?

Usually the training courses start at 9:00 am and end at 5:00 pm of the respective local time. The actual course times will be stated in the booking confirmation. Please note that, depending on the training host, there may be a possible time shift between your and the provider's local time. Therefore all local times are provided with the valid time shift to Greenwich Mean Time (GMT). 

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