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Materials: technology, behaviour, fatigue, corrosion - 2019

Fatigue and rupture of metallic materials

Morphological analysis of fractures


The course helps learners:

  • better understand the presence of defects in metallic materials and welded joints through the principles of fracture mechanics
  • evaluate the conditions of incipient or propagating cracks in parts or joints subjected to cyclic stresses or corrosion under stress
  • exploit a broken part by means of morphological analysis


The course lasts 5 days (30 hours) and includes:

  • 8 half-days lectures with discussion
  • 1 half-day of practical laboratory work
  • 1 final panel discussion


This course presents the conditions of incipient or propagating cracks and the approach to adopt when defects occur.

It is intended for designers, users and equipment maintenance staff.

Learners will explore the influence that the microstructure, which depends on heat treatments, shaping or assembly, has on behavior. Lessons learned from a broken part will be examined.

The course covers mainly metallic materials.


Course level: Basic/Advanced

Good educational background. Basic knowledge of materials science and materials resistance.



Consultant at CESMAN (DCNS Research), leader of the fracture group of the Comité Consultatif de Recherches en Soudage (CCRS) (the Advisory Committee for Welding Research)

Thierry MILLOT:

Engineer at the Centre d’Expertise des Structures et Matériaux Navals (Naval Structures and Materials Expertise Center) (DCNS Research);

Specialist in Fracture Mechanics; member of the Titanium Association


  • How to deal with a defect
    • Ductile fracture and brittle fracture - Influence of the presence of a crack - Critical stress intensity factor (KIC)
  • How to evaluate toughness
    • Determining the stress intensity factor (KIC)
    • Analysis of parameters influencing the KIC
    • Role of the material and conditions of use
    • Critical fault size evaluation
    • Fracture in the elastoplastic domain: JIC, local approach
  • How to avoid fatigue fractures
    • WÖHLER curve - probabilistic aspect
    • Defect initiation - Propagation of a crack - Analysis through fracture mechanics
    • Evaluation of the residual life of a damaged structure - Fatigue of welded joints
    • Oligocyclic fatigue:
      • Deformation in the plastic domain
      • Energy aspects - Mechanics of damage
  • Residual stresses
    • Origin of residual stresses (mechanical, thermal, etc.)
    • Evaluation of the distribution by measurements or by digital simulation - Evaluation according to temperature and stresses - Consequences on life expectancy
    • Considerations (initiation criterion, etc.)
  • How to use defective parts
    • How to make the most of a broken part
    • Macroscopic and microscopic aspects
    • Applying different analytical techniques
    • Scanning electron microscopy
    • Current fracture analysis
  • How to manage the risk of corrosion
    • Electrochemical process of KISCC corrosion criterion
    • Influence of the corrosive environment - Effect of water, moisture or hydrogen - Kinetics of crack growth under stress corrosion - Aluminum and titanium alloys and various categories of steel
  • Role of non-destructive testing in the evolution of damage
    • Main methods used
    • CNDs at different stages of the life of materials and structures - CND for structure design
    • Detection, location, sizing of defects
    • Possibilities, limits
  • Evaluating risks associated with welded joints
    • Fatigue behavior of S-N welded-curved joints
    • Damage under variable loads
    • Ability to use a welded structure with a defect (FAD)


Scheduled in French:

PARIS: 1 to 5 April 2019


For the English realization, please, consult us.


€1,990 excluding tax (20% VAT)

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