Abaqus Learning: Fracture & Fatigue Theory & Implementation.

Fatigue Crack Growth Using XFEM Method With Paris Law In ABAQUS (Direct cyclic Low cycle fatigue approach)

What you'll learn

Introduction to fracture mechanics (theory)

Finite element method (FEM) and Extended finite element method (XFEM) ((theory))

Fatigue crack growth (theory)

ABAQUS general explanation

fatigue model creation "how to define the XFEM, how to implement Paris law, define the pre-crack length & location, direct cyclic and how to control accuracy.

Three different case studies

how to deal with stationary cracks to calculate fracture mechanics parameters like SIF.

Requirements

only the basic knowledge of material properties. as the course content contains the basis for fracture mechanics, FEM and ABAQUS explanation from zero

Description

Fatigue represents the most common cause of mechanical structure failures. To investigate this phenomenon, studies have conducted experiments, conducting actual fatigue experiments demands extensive time, substantial financial resources, and is constrained by size limitations. The solution lies in the development and validation of precise numerical models. This is the primary driver behind our course, as it enables accurate and reliable predictions of crack growth. This course delves into the advanced simulation of fatigue crack growth using the eXtended Finite Element Method (XFEM) combined with the Paris Law formulation, fully implemented in ABAQUS software. The course emphasizes the direct cyclic and low cycle fatigue approaches, providing a comprehensive framework for analyzing the degradation of materials under cyclic loading.You Will Learn:1. Fundamentals of fracture mechanics and Fatigue Crack Growth:2. Finite Element Method (FEM) and eXtended Finite Element Method (XFEM)    - Core principles of FEM and how they apply to crack propagation simulations.    - Coverage of XFEM, including enrichment functions, and  level-set methods.    - How to model cracks without remeshing the mesh during propagation and how XFEM handles discontinuities.3. Fatigue Crack Propagation Regimes:    - Understanding the relationship between crack size and cycles, including factors like stress ratio effects.    - Detailed exploration of crack growth laws, including Paris Law, Walker Law, and NASGRO formulations.    - Methods for life prediction, failure criteria, and assessing the factor of safety in fatigue analysis.4. Model Creation in ABAQUS:    - Step-by-step guidance on part creation and material definition, including damage models for traction separation.    - Implementation of direct cyclic and low cycle fatigue steps, focusing on Fourier representations, and convergence criteria.    - Special interaction properties like pre-crack definitions and Paris Law implementation for fatigue analysis.5. Results Interpretation and Post-Processing:    - Visualizing crack propagation patterns across different cycles.    - Generating and analyzing key outputs such as crack length vs. cycle graphs and fatigue crack growth rates (da/dN vs. ΔK).6. Three different case studies.Course Features:- Detailed theoretical background paired with practical modeling exercises in ABAQUS.- Real-world case studies and examples, including complex geometries.- Guidance on setting up simulations for brittle materials using LEFM principles.Who Should Enroll:This course is designed for engineers, researchers, and under graduate or graduate students who wanted to get a very good  understanding of finite element analysis and wish to expand their knowledge in the field of fracture and fatigue analysis using ABAQUS. It is particularly beneficial for those interested in crack growth modeling and the application of advanced methods like XFEM and direct cyclic analysis in practical engineering scenarios.By the end of the course, participants will be able to simulate, analyze, and interpret fatigue crack growth in various materials and loading conditions, providing them with a competitive edge in the field of structural analysis and design.

Overview

Section 1: Introduction to fracture mechanics

Lecture 1 Introduction

Lecture 2 overview

Lecture 3 Stress Concentrations Around Cracks

Lecture 4 Modes of Loading

Lecture 5 Stress intensity factor

Lecture 6 Superpostion principle

Lecture 7 Fracture toughness

Lecture 8 Linear elastic fracture mechanics (LEFM)

Lecture 9 Fatigue crack growth (FCG)

Section 2: Finite element method v.s extended finite element method (theory)

Lecture 10 Finite element method

Lecture 11 Extended finite element method

Section 3: Fatigue crack growth theory (FCG)

Lecture 12 Definition of Loading

Lecture 13 fatigue crack growth relationships

Lecture 14 Failure criteria, life time and factor of safety

Section 4: ABAQUS Model Creation

Lecture 15 Part Creation

Lecture 16 material definition

Lecture 17 Direct cyclic

Lecture 18 Specifying convergence criteria

Lecture 19 Edit accuracy parameters and restart analysis

Lecture 20 Low cycle fatigue

Lecture 21 Field output requesting

Lecture 22 Interactions and special crack definition

Lecture 23 Paris law implementation

Lecture 24 load, Mesh and Job modules

Section 5: Case studies

Lecture 25 Case study 1

Lecture 26 Case study 2

Lecture 27 Case study 3

Lecture 28 Static analysis and calculating K and Y

for all levels in ABAQUS and fracture mechanics