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Ternopil Ivan Puluj National Technical University

Факультет інженерії машин, споруд та технологій

Кафедра будівельної механіки

Fracture Mechanics


Major 192 - Будівництво та цивільна інженерія (бакалавр)
Field of knowledge 19 Архітектура та будівництво
Academic degree bachelor's
Course type elective
special education
Study start course 4
Semesters From 7 — to 8
Form of education full-time
Study hours structure
32– lectures
16– laboratory classes
Amount of hours for individual work 72
ECTS credits 4
Form of final examination credit
Academic degree PhD
Academic title Assoc. Prof.
Full name Volodymyr Iasnii
Course goals and learning objectives
Fracture mechanics is the field of mechanics concerned with the study of the propagation of cracks in materials. It uses methods of analytical solid mechanics to calculate the driving force on a crack and those of experimental solid mechanics to characterize the material's resistance to fracture. In modern materials science, FM is an important tool used to improve the performance of mechanical components. 
Course description
Lectures Topic 1. Introduction to FM.
Review of tension test and torsion. Method of handling combined stresses, principal stresses. Definition of failure, yield criteria, buckling as a failure mode. Need for fatigue test and focus on what data being collected.
Topic 2. Stress-Strain Diagrams, Material Properties.
Tension test and stress-strain diagram, Internal properties and Hooke’s law, 0.2% offset yield stress and strain hardening, Poisson’s ratio.
Topic 3. Spectacular Failures.
Further details on Fatigue test, review on conventional design methodologies. List of spectacular failures. Common applications of fracture prevention.
Topic 4. Linear elastic fracture mechanics and elastic-plastic fracture mechanics.
Contributions of Inglis, Griffith and Irwin. Extremum cases of an elliptical hole, Various results of fracture in glass, Classification of LEFM and EPFM - based on plastic deformation, materials and applications. Modes of Loading - Mode-I, Mode-II and Mode-III.
Topic 5. Importance of Fracture Mechanics.
Test for fracture mechanics, Crack-growth curves, Residual strength diagram, Summary of fracture parameters. Practical examples of fracture.
Topic 6. Fatigue Crack Growth Model.
Crack growth and fracture mechanisms. Shear-lip in necking. Fatigue crack growth model. Striations and Beachmarks.
Topic 7. Crack Growth and Fracture Mechanisms.
Clarifications on fatigue crack growth model. Stress corrosion cracking (SCC) - Active path dissolution, Hydrogen embrittlement, Film induced cleavage. Creep, Corrosion fatigue, Liquid metal embrittlement.
Topic 8. Elastic Strain Energy.
Surface energy, Elastic strain energy stored in terms of stress components, in terms of axial, torsion and bending loads for slender members. Strain energy change in the presence of a crack under constant loading and constant displacement.
Laboratory classes 1.Method of handling combined stresses
2. Stress-Strain Diagrams, Material Properties
3. Fatigue test, review on conventional design methodologies
4. Extremum cases of an elliptical hole
5. Crack-growth curves
6. Crack growth and fracture mechanisms
7. Fatigue crack growth model
8. Elastic strain energy approaches
Course author
PhD, Assoc. Prof. Volodymyr Iasnii 
Дата останнього оновлення: 2020-11-29 22:58:42