Chapter 8_Tu-Lecture 13

Chapter 8_Tu-Lecture 13 - Chapter 8 Failure Analysis and...

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Chapter 8 Failure Analysis and Prevention Issues to address… How do we evaluate impact energy? How does temperature affect impact energy? What is ductile-to-brittle transition temperature? What is fracture toughness and how can it be used to predict material’s failure? How does a material fail under cyclic stress
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Figure 6-6 Tensile Test Toughness
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3 Charpy Test Figure 8-1 Impact energy
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Ductile-to-Brittle Transition Temperature (DBTT) More Ductile Brittle Impact Energy Temperature FCC metals (e.g., Cu, Ni) BCC metals (e.g., iron) Polymers/Plastics Ductile-to-brittle transition temperature HCP metals (e.g., Mg)
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Ductile vs Brittle Failure Very Ductile Moderately Ductile Brittle Large Moderate % EL Small Figure 8-4
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6 Figure 8-3a Ductile-to-Brittle Transition Temperature
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7 Figure 8-3b Ductile-to-Brittle Transition Temperature
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Design Strategy: Stay Above The DBTT! Royal Mail Ship sank on April 12, 1912 Low carbon steel with a DBTT of 32-56 o C Sea water T at time of collision: ~-2 o C The Titanic
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Liberty ships
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Chapter 8_Tu-Lecture 13 - Chapter 8 Failure Analysis and...

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