FKM Fracture Mechanics

Forschungskuratorium Maschinenbau
/ Research Committee Mechanical Engineering

23 October 2024, online

Language: English

This training course covers the ”FKM-Guideline Fracture Mechanics” 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 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.

C​ourse Contents

Introductory remarks
Background information and overview of the guideline
Basics on fracture mechanical concepts
Linear elastic vs. elastic-plastic fracture mechanics
Failure assessment diagrams
Static vs. cyclic loading
Assessment concept of the guideline

Input quantities and modelling
Defects
Stress state
Material properties

Computational Procedures
Static loading
Cyclic loading
Advanced topics

Proof concept
Safety margins and reserve factors, sensitivity analysis, probabilistic analysis
Applications

Course Agenda

9:00-10:30

  • Introductory remarks
    Background information and overview of the guideline
  • Basics on fracture mechanical concepts
    Linear elastic vs. elastic-plastic fracture mechanics
    Failure assessment diagrams
    Static vs. cyclic loading
    Assessment concept of the guideline

11:00-12:30

  • Input quantities and modelling
    Defects
    Stress state
    Material properties

13:30-15:00

  • Computational Procedures
    Static loading
    Cyclic loading
    Advanced topics

15:30-17.30

  • Proof concept
    Safety margins and reserve factors, sensitivity analysis, probabilistic analysis
  • Applications

 

PSE

PSE Competencies addressed by this training course

MASco5

Discuss the general issue of scatter in material properties relevant to your analysis and simulation and how this is allowed for.

MASco23

Discuss common material characteristics and typical manufacturing related flaws in other processes relevant to your industry sector.

FATco1

Discuss the initiation, propagation and fast fracture stages of Fatigue in metallic materials.

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.

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,

FATap6

Employ a finite element analysis system for the fatigue analysis of a component or structure.

FATsy5

Specify appropriate idealisation(s) for welds, which are consistent with the objectives of fatigue analyses and available computing resources.

FAFMkn2

Summarise the scope of fracture mechanics for the different types of cracks and material situations

FAFMco2

Show how the geometry of a general 3D crack profile may be sketched and explain what the conditions of plane strain and plane stress represent

FAFMco4

Describe the three modes of fracture with respect to a point on a general 3D crack profile, and discuss the angled crack problem in the 2D plane

FAFMco10

Discuss the main components required of a FE model to represent the main features of a cracked structure, to include the discrete crack geometry, material properties and mechanical/thermal loads

FAFMco32

Describe the features of a fracture assessment diagram (FAD) and how it is used

FAFMco33

Explain Neuber's Rule.

FAFMco37

Describe a typical welding residual stress distribution for a common welded joint.

FAFMap5

Use available design standards or code of practice Algorithms or Flowcharts for flaw assessment in components.

FAFMan1

Analyse the results from fracture mechanics analyses of typical components and determine whether they satisfy requirements.

FAFMev1

Select appropriate FM strategies.

PLASap2

Use FEA to determine Limit Loads for a range of components.

 



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