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Structural mechanics
Structural mechanics

Quick Insights on Fatigue Life Assessment with FEM

Overview

Training Advanced

From set square and calculation assessment to Excel for fatigue and life cycle calculation using FEM: this training provides a clear and understandable introduction into fatigue life assessment. This training is offered as a 2-day course.

Duration
2 days

Prerequisites
Basic knowledge of Ansys Mechanical

Software used
Ansys Mechanical

Benefits
  • Applying methods supported by Excel Tools to calculation tasks
  • A quick introduction into fatigue strength with FEM
  • Independently carrying out strength verifications using FEM results
  • Increasing the capacity of existing components

Description

Operational strength calculations are increasingly being performed following a finite element (FEM) calculation. This often leaves many questions unanswered. How fine should the FE mesh be? What elements should be used? How do you evaluate a stress gradient? What should you consider when constructing and evaluating a finite element model? How do you calculate an SN curve for your finite element model?

This training focuses on the fundamentals of fatigue life assessment and provides a clear and understandable presentation in simple language. You will receive concrete and directly applicable methods supported by Excel tools for an independently created operational strength verification based on finite element results. The theory is supplemented by practical exercises and sample solutions.

Are you an experienced computational engineer? Do you validate your components with regulations such as the FKM Guideline? Or are you a newcomer to structural mechanical simulation and fatigue life calculation? Then this course is just right for you!

Detailed agenda for this 2-day training

Day 1

01 FEM for fatigue strength

  • The requirements of FEM software from the perspective of fatigue strength
  • Practical tips for the application of FEM for fatigue strength
  • Demo: Use of FEM, analysis and validation of the results

02 Structural strength assessment

  • Stress types
  • Notch effect
  • Supporting effect
  • Over-elastic stresses
  • Component yield curves
  • Workshop: Analysis of a crane hook and its static protection

03 Fatigue strength assessment

  • Strength hypotheses and material behavior under multiaxial vibration loads
  • Fatigue strength verification
  • Fatigue strength diagram
  • Considering the statistical scatter of fatigue strength values
  • Principal impacts on vibration resistance
  • Workshop: Carrying out a fatigue strength verification of an FE model

04 S-N fatigue curves

  • Periodic vibration stress
  • Wöhler lines and Wöhler line diagrams
  • Computing Wöhler stress lines
  • Cyclical deformation behavior
  • Workshop: Calculating the Wöhler line for a shaft shoulder (as input for later FEM analysis)

Day 2

05 Variable amplitude loading

  • Basic statistical concepts
  • Classification method with two-parameter counting (rainflow counting)
  • Further processing of classified stress data
  • Extrapolating measured collectives

06 Damage accumulation and fatigue life estimation

  • Models for damage accumulation with vibrating loads (Miner rules)
  • Fatigue and durability lines
  • Damage accumulation with overset mechanical and thermal stresses
  • Considering statistical scatter in the fatigue and durability assessment and derivation of appropriate safety factors
  • Workshop: Calculating the fatigue and durability of a crane hook

07 Overview of advanced methods

  • Calculating weld seams
  • Low cycle fatigue in accordance with the strain concept
  • Approaches to evaluation of multiaxial loads
  • Guideline FKM
  • DIN 743

08 Realistic exercise example

  • Applying the notch root concept to constructions with nominal stresses and local elastic stresses (FEM)
  • Assessing component Wöhler lines
  • Fatigue strength verification to estimated dimensioning, DIN 734, and FKM 183 based on nominal and local elastic stresses (FEM)
  • Processing with load sequences for multilevel vibration loads (classification and extrapolation)
  • Operational strength with FEM with linear-elastic computation

Your Trainers

Dr.-Ing. Stefan Einbock
CEO, EINBOCK AKADEMIE
Florian Mailänder
Business Development Manager, CADFEM Germany GmbH, Stuttgart
Artur Bocian
Engineer, CADFEM UK Ltd

Placement in the CADFEM Learning Pathway

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What CADFEM customers are saying

 Alexander Pfitzer Development Engineer Structural Design, Voith GmbH & Co. KGaA
Alexander Pfitzer
Development Engineer Structural Design, Voith GmbH & Co. KGaA

Dr. Einbock’s course offers a very comprehensive insight into the world of operational strength. He manages to put the complexity of the various guidelines into a comprehensible perspective and supplement it with a variety of practical tips and examples based on everyday professional life.

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). 

Head of Professional Development
Dr.-Ing. Marold Moosrainer