Fundamentals of Fracture Mechanics & API-579 for Piping & Pressure Vessel Engineers

This course will cover

• Ductile tearing vs brittle fracture

• Mathematical preliminaries –Line, and surface integrals.

• What is Fracture mechanics? Difference between Charpy Impact testing and Fracture mechanics.

• Why should we study fracture mechanics?

• An overview of some key laws of physics

• The mechanics of crack propagation-Griffith criterion.

• Challenges to and Modifications of Griffith criterion

• Concept of energy release rate

• Mode I, II and III of Fractures

• Crack tip displacement

• Stress field in the vicinity of a crack

• Stress field singularity

• Stress intensity factor

• Effect of finite size

• Some K1c solutions

• Concept of weight function

• Principle of superposition

• Limitations of linear elastic fracture mechanics- Crack-tip plasticity

• Relation between K and G

• Effect of thickness

• Linear elastic fracture mechanics(LEFM)

• Crack Tip Opening displacement (CTOD)

• Estimation of CTOD

• Alternate definitions of CTOD

• J-Integral

• J Integral and plasticity

• Fracture toughness test specimens and their tests

• Fracture toughness test as per ASTM 399

• K1c testing

• Experimental determination of J integral.

• The concept and applications of Failure Assessment Diagram (FAD).

• Fracture mechanics-based fatigue analysis.

• How Fracture mechanics is referenced in ASME boiler and PV codes, ASME piping codes, and API 579.