tailieunhanh - Introduction to Fracture Mechanics

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 modern materials science, fracture mechanics is an important tool in improving the mechanical performance of materials and components. It applies the physics of stress and strain, in particular the theories of elasticity and plasticity, to the microscopic crystallographic defects found in real materials in order to predict the macroscopic mechanical failure of bodies | Simpo PDF Merge and Split Unregistered Version - http Introduction to Fracture Mechanics From Suresh Fatigue of Materials 1 Simpo PDF Merge and Split Unregistered Version - http INTRODUCTION Importance of Fracture Mechanics AH real materials contain defects understand the influence of these defects on the strength of the material. Defect-tolerant design philosophy. Relevance for Fatigue understand the initiation and growth of fatigue cracks. We will use two approaches an energy-based approach and a more rigorous mechanics approach. 2 Simpo PDF Merge and Split Unregistered Version - http Introduction Griffith Fracture Theory Key Idea Griffith 1921 postulated that for unit crack extension to occur under the influence of the applied stress the decrease in potential energy of the system by virtue of the displacement of the outer boundaries and the change in the stored elastic energy must equal the increase in surface energy due to crack extension.