Section 3D Fracture/Fatigue

Section 3D - MATE 210 F Section 3 Failures Fracture – Fatigue Creep(Smith Chapter 7 What causes failure in materials Based on our understanding

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Unformatted text preview: MATE 210 F Section 3 Failures Fracture – Fatigue - Creep (Smith Chapter 7 ) What causes failure in materials? Based on our understanding of the behavior of materials, what can we do to prevent failures? (process-structure-properties-performance) “When materials go bad….” MATE 210 Ductile Fracture Brittle Fracture “cup and cone” necking, plastic deformation flat, abrupt surface no plastic deformation MATE 210 • Ductile failure:--one piece--large deformation • Brittle failure:--many pieces--small deformation Figures from V.J. Colangelo and F.A. Heiser, Analysis of Metallurgical Failures (2nd ed.), Fig. 4.1(a) and (b), p. 66 John Wiley and Sons, Inc., 1987. Used with permission. EX: FAILURE OF A PIPE MATE 210 Crack Propagation Repeatedly break bonds along a crystallographic plane SEM fractographs – ductile cast iron Transgranular cracks pass through grains Intergranular Crack propagation along grain boundary MATE 210 • T oughness- amount of energy a material can absorb before fracturing notched sample rapid loading range of test temperatures MATE 215 Lab Fracture toughness (K): correlates with impact energy Brittle - low energy, cleavage Ductile - high energy, shear Charpy Impact Fracture Tests MATE 210...
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This note was uploaded on 04/02/2008 for the course MATE 210 taught by Professor Niebuhr during the Spring '05 term at Cal Poly.

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Section 3D - MATE 210 F Section 3 Failures Fracture – Fatigue Creep(Smith Chapter 7 What causes failure in materials Based on our understanding

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