FKM Linear Training Course

Forschungskuratorium Maschinenbau
/ Research Committee Mechanical Engineeering

29 - 30 October 2024, online

Language: English

This online training course covers the ”FKM-Guideline Linear” for static and cyclic loading. Besides the detailed assessment procedures, background on the individual topics will be given for better understanding about the procedures. The course is aimed at newcomers in the field as well as experts interested in the concept of the internationally widely accepted guideline.

The FKM guideline is a standard developed by the Forschungskuratorium Maschinenbau (Research Committee for Mechanical Engineering) – FKM - for static and cyclic strength verification. Due to its broad applicability, the strength verification has become widely used in mechanical engineering and other industries.

Course contents

Background information and overview of the guideline Strength for monotonic loading – static strength

Basics on static strength
Finite element modeling and postprocessing
Nominal vs. notch stresses
Plastic section factors
Allowable stress
Nominal stress concept with example
Notch stress concept with example

Strength for cyclic loading – fatigue strength

Basics on Fatigue Failure
Constant vs. variable amplitude loading
Rainflow counting
Fatigue notch factor
Factors affecting durability
Nominal stress concept with example
Notch stress concept with example

Course Agenda

Day 1

9:00-10:30

Introductory remarks
Background information and overview of the guideline
Strength for monotonic loading – static strength I
Basics on static strength
Finite element modeling and postprocessing

11:00-12:30

Strength for monotonic loading – static strength II
Nominal vs. notch stresses
Plastic section factors
Allowable stress

13:30-15:00

Strength for monotonic loading – static strength III
Nominal stress concept
Example

15:30-17.30

Strength for monotonic loading – static strength IV
Notch stress concept
Example

Day 2

9:00-10:30

Cyclic strength I
Basics on Fatigue Failure
Constant vs. variable amplitude loading
Rainflow counting

11:00-12:30

Cyclic strength II
Fatigue notch factor
Factors affecting durability

13:30-15:00

Cyclic strength III
Nominal stress concept
Example

15:30-17.30

Cyclic strength IV
Notch stress concept

PSE

PSE Competencies addressed by this training course

MESMco19	Explain how the interaction of stress concentrations may be handled.
MASco5	Discuss the general issue of scatter in material properties relevant to your analysis and simulation and how this is allowed for.
MASco8	Explain, in metallurgical terms, how fatigue cracks form and grow in metallic materials.
MASco9	Explain, in metallurgical terms, how brittle and ductile cracks form in steels and how their appearances differ.
MASkn4	List any material temperature limits (high and low) specified for the materials commonly used in your industry sector.
FATkn3	List potential sites for fatigue in your company products.
FATkn4	Sketch a sinusoidal stress variation and show the maximum stress, minimum stress, mean stress, alternating stress (or stress amplitude), stress range and stress ratio.
FATkn6	List ways of inducing beneficial compressive stresses in your company products.
FATco1	Discuss the initiation, propagation and fast fracture stages of Fatigue in metallic materials.
FATco2	Describe how the data used to construct an S-N curve are obtained.
FATco3	Discuss the term high cycle fatigue, highlighting a common source in your company products.
FATco4	Discuss the statistical nature of fatigue and explain how this is handled in relevant design standards and codes of practice.
FATco5	Discuss the salient features of an S-N diagram for steels and explain the terms endurance limit, infinite life and low cycle fatigue.
FATco7	Discuss the observed relationship between endurance limit and static tensile strength for steels and explain why this relationship does not hold for welded steels.
FATco11	Explain the use of Endurance Limit Modifying Factors in Stress-Life based fatigue assessment.
FATco12	Discuss how temperature, plate thickness and modulus effects are typically handled in relevant design standards and codes of practice and explain why this is necessary.
FATco14	Discuss the term Fatigue Strength Reduction Factor in relation to stress concentrations and explain how this has traditionally been handled in relevant design standards and codes of practice.
FATco15	Discuss the concept of cumulative damage and explain how this is commonly handled.
FATco16	Explain why a multiaxial stress field can complicate an analysis and discuss approaches to handling this.
FATco17	Discuss the significance of the choice of equivalent stress used in the fatigue assessment of welded joints
FATco18	Outline a conservative approach to situations where the directions of principal stresses vary during a stress cycle.
FATco25	Reflect on why fatigue is such a long-standing and persistent cause of failure.
FATco35	Discuss the term endurance limit for many non-ferrous metals, steels in a corrosive environment and the possible effects of load sequencing.
FATco36	Discuss any particular characteristic fatigue properties and behaviour for any materials being considered in analyses and assessment.
FATco37	Reflect on how variable amplitude load sequencing can affect the prediction of damage accumulation and fatigue life.
FATap2	Carry out elastic fatigue assessment using design standards and code guidelines for components and structures including any special procedures for ancillary components such as bolts,
FATap3	Modify the results of an elastic analysis for the effects of plasticity, where necessary.
FATap5	Use Reservoir Counting / Rainflow Method or similar to specify the necessary stress ranges, number of cycles and loading history for any component to be analysed.
FATap6	Employ a finite element analysis system for the fatigue analysis of a component or structure.
PLASap2	Use FEA to determine Limit Loads for a range of components.
PLASap7	Using standard material data, derive a true stress vs true strain curve to be used for nonlinear analysis.
PLASco21	Explain the rationale behind the 5% strain limit in some codes of practice.

Trainer

Prof. Dr.-Ing. Klemens Rother
University of Applied Sciences Munich, Germany

Engineering Degree in Mechanical Engineering / Doctoral thesis in analytical fatigue assessment of multiaxial, non-proportional stress states

Prof. Rother has over 20 years of industrial experience in responsible positions: design and qualification in transportation systems, pressure vessel design, consulting in computational engineering, software development and development and implementation of knowledge based systems.

Since 2008 Professor at Munich University of Applied Sciences
Since 2019 Founding member of the Institute of Material- and Building Research, IMB, Munich University of Applied Sciences
Teaching: Mechanics of Materials, Lightweight-Design, Fatigue&Fracture, Conceptual Desing of Mechanical Structures
Fields of Research: Structural Integrity, CAE, Conceptual Design and CAE in the Early Phase, Fatigue Analysis, Welded Structures
Head of Masters Program Computional Engineering, Munich University of Applied Sciences
Gründungsmitglied des Promotionszentrums für Integrales Bauen an der Hochschule München
Founding member of the Doctoral Research Center of Integrated Buildings (PZIB) at Munich University of Applied Sciences

More information:
Prof. Dr.-Ing. Klemens Rother (mwn.de)
https://orcid.org/0000-0002-9643-4967

Organisation

Duration
Day 1: 9:00 am - 5:30 pm
Day 2: 9:00 am - 5:30 pm
Login phase from 8:30 am.
Time zone: CET (Central European Time), UTC+1 (Berlin)

Language
English

Course Fee
Non NAFEMS members: 1.550 Euro / person*
NAFEMS member: 1.200 Euro / person*
Included in the fees are digital course notes in English language and a certificate.
* plus VAT if applicable.

NAFEMS membership fees (company)
A standard NAFEMS site membership costs 1,365 euros per year, an academic site and entry membership costs 855 euros per year.

Cancellation Policy
Up to 6 weeks before course starts: free of charge;
up to one week before: 75 %;
later and no show: 100 %.

Course cancellation
If not enough participants we keep the right to cancel the course one week before. The course can be canceled also in case of disease of the speakers or force majeure. In these cases the course fees will be returned.

Organisation / Contact
NAFEMS
e-mail: roger.oswald@nafems.org

Accreditation Policy

The course is agreed and under control of NAFEMS Education and Training Working Group (ETWG).

FKM Linear