Fracture Mechanics

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Last updated 10:00 PM on 4/27/26
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10 Terms

1
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Define 2 forms of material failure

  • Brittle fracture - little plastic deformation (ceramics, high strength metals)

  • Ductile fracture - extensive plastic defromation prior to fracture (most of metals and polymers)

<ul><li><p><strong>Brittle fracture</strong> - little plastic deformation (ceramics, high strength metals)</p></li><li><p><strong>Ductile fracture</strong> - extensive plastic defromation prior to fracture (most of metals and polymers) </p></li></ul><p></p>
2
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Griffith energy balance equation

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3
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Sketch the change of the potential energy terms with respect to the crack length.Identify the point of unstable equilibrium and state the condition for a spontaneouspropagation of the crack.

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4
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Stress intensity factor formula

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5
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Fracture condition for K

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6
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What is the relationship between K and G

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7
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How to check if the specimen is thick enough

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8
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How to find plastic zone size

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9
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Yield-before-break condition

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10
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Leak-before-break condition

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