Chapter3a_fail

Chapter3a_fail - Chapter 3a Failures Fracture Required...

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Chapter 3a Failures Fracture
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Required Reading • Fundamentals of Fracture - Callister, p. 208-215 • Fracture toughness - Callister, p. 217-227 • Fatigue - Callister, p. 227 -237 for Chapter 3b • Creep - Callister, p. 238-240 for Chapter 3b • Corrosion – Callister, for information read briefly, p. 640-648
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Failures Occur • There is always a chance that new or existing parts will fail. Why? – Faulty or misunderstood design – Defective material – Manufacturing deficiency – Misuse – Combination of the above
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Mechanisms for AERO3700 Ductile overload p. 209 occurs when σ applied > σ yield Brittle fracture p. 211 occurs when the stress intensity K the fracture toughness K C • more typically we use K I K IC which refers to opening mode (I) and plane strain •K IC is a lower value and conservative in use Fatigue p. 227 failures occur when a crack initiates and grows due to cyclic dependent strain. Loads come from vibrations, rotating parts, temperature changes, pressure changes. σ fatigue < σ yield
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– design strategies: infinite life, safe life, fail safe and damage tolerant design – low and high cycle fatigue occur • Creep p. 238 is a slow time dependent and permanent deformation which occurs a ‘high’ temperatures, to parts under load or stress. High is:
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This note was uploaded on 11/13/2011 for the course CIVE 2*** taught by Professor - during the Spring '11 term at Carleton CA.

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Chapter3a_fail - Chapter 3a Failures Fracture Required...

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