Lesson_23_EMA_6715_F10

Lesson_23_EMA_6715_F10 - Analysis K IC = Y c 1/2 Crack...

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Mirror Mist Hackle Fracture origin Characteristic Markings Are Observed on the Fracture Surface
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Characteristic Features Aid Failure Analysis K C = Y σ (c) 1/2 K Bj = Y σ (r j ) 1/2 c = (a b ) 1/2 r j / c = constant Critical Crack Mirror region Mist region Hackle region
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4 J. J. Mecholsky, R.W. Rice and S. W. Freiman, JACerS 57, 440 (1974) σ f = M 2 / r 2 0.5 σ f = K B2 / Y 2 r 2 0.5 Mirror constants are related to toughness of materials log σ f = log M 2 - 0.5 log r 2
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J.J. Mecholsky, Jr., Fractography of Optical Fibers, in ASM Engineered Materials Handbook, 4, Ceramics and Glasses, Section 9: Failure Analysis, (1992). Relationship Holds For Large Size & Stress Range σ r1/2 = constant
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6 Fracture Mechanics & Fractography Provide A Framework for Quantitative
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Unformatted text preview: Analysis K IC = Y c 1/2 Crack Boundary K B1 = Y 1 r 1 1/2 Mirror-Mist Boundary K B2 = Y 2 r 2 1/2 Mist-Hackle Boundary K B3 = Y 3 r 3 1/2 Crack Branching Boundary [c/r j = constant] FSA Can Be Applied To Single Crystals FSA Can Be Applied To Si Chip = 86 MPa Slate Fracture Surface Appears On Window Sill Courtesy of Prof. Yet-Ming Chiang Epoxy Fracture Shows Markings Glass Fiber is Origin Glass Fiber Fractures Within Epoxy Matrix Brittle Fracture Is Observed At Many Length Scales Brittle Fracture Can Be Observed At Many Length Scales Courtesy of Dr. Darryl Butt [UF] Branching Patterns Vary 47 MPa 60 MPa 87 MPa 92 MPa MgF 2...
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Lesson_23_EMA_6715_F10 - Analysis K IC = Y c 1/2 Crack...

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