Fatigue failure is one of the most common types of failure of welded tubular joints under cyclic loads . In General, fatigue life of tubular joints can be estimated by referring to the s-N curve method which depends on the accurate stress concentration factor (SCF) prediction and stress distribution for tubular joints under General load conditions.

Усталостное разрушение является одним из наиболее распространенных видов разрушения сварных трубчатых соединений при циклических нагрузках . Вообще, срок службы при усталостных нагрузках трубчатых соединений может быть оценен путем ссылаться на метод кривой с-Н который зависит от точного прогноза фактора концентрации напряжений (SCF) и распределения стресса для трубчатых соединений под общими условиями нагрузки.

• INTRODUCTION
• CHAPTER 1. REVIEW OF RESEARCH WORKS
• 1.1 Types and Features of Tubular joints
• 1.2 Research Status of Tubular joints
• 1.2.1 Research on Static Ultimate Strength of Tubu
• 1.2.2 Fatigue Study of Tubular joints
• 1.3 Tubular structure Fatigue Analysis Thought
• 1.3.1 Stress Analysis Methods of Tubular joints
• 1.3.2 Stress in the Tubular joints
• 1.3.2.1 Definition of Nominal Stress
• 1.3.2.2 Definition of Hot Spot Stress and Stress C
• 1.3.3 fatigue damage mechanism of tubular joints
• 1.3.3.1 Definition of Fatigue Failure at Tubular J
• 1.3.3.2 Fatigue Analysis Method for Tubular Joints
• 1.3.3.3 S-N Curve
• CHAPTER 2. Mathematical Model
• 2.1 T- joint geometry model
• 2.2 Finite Element Analysis of a Typical T- joint
• 2.3 Generation of Finite Element Mesh for tubular
• 2.3.1 Selection of Element Types
• 2.3.2 Tubular Joint Grid Generation Principle
• CHAPTER 3. Finite Element Analysis of the Stress C
• 3.1 Generation of a typical T-joint grid
• 3.2 Finite Element Analysis of a Typical T-joint
• 3.3 Analysis of Stress Concentration Factor of T-j
• 3.3.2 Influence of parameter β on stress distribut
• 3.3.3 Influence of parameter γ on stress distribut
• 3.3.4 Influence of parameter τ on stress distribut
• 3.3.5 Influence of Parameters on Stress Concentrat
• 3.3.6 Influence of Parameters on Stress Concentrat
• 3.4 Parameter Fitting of Maximum Value of Stress C
• 3.4.1 Parameter Formula of Stress Concentration Fa
• 3.4.2 Parameter Formula of Stress Concentration Fa
• 3.4.3 Parameter Formula of Stress Concentration Fa
• 3.4.4 Parameter Formula of Stress Concentration Fa
• 3.5 Distribution Formulas of Stress Concentration
• 3.5.1 The distribution formula of stress concentra
• 3.5.2 The distribution formula of stress concentra
• 3.6 T- joint stress concentration factor distribut
• Conclusion
• Reference