2007-MECH141-08%20Failure.pdf(hit)___2007-MECH141-08%2BFailure

2007-MECH141-08%20Failure.pdf(hit)___2007-MECH141-08%2BFailure

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Mechanical Failure – Chapter VIII Oil tank fracture due to crack growth Electronic chip failure due to thermal stress Hip implant failure to cyclic loading
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Mechanical Failure – Chapter VIII Ductile and brittle fracture Ductile failure: --one piece --large deformation • Brittle failure: --many pieces --small deformation
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Mechanical Failure – Chapter VIII Ductile and brittle fracture (a) Highly ductile fracture in which the specimen necks down to a point. (b) Moderately ductile fracture after some necking. (c) Brittle fracture without any plastic deformation.
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Mechanical Failure – Chapter VIII Ductile fracture: ( a) Initial necking. (b) Small cavity formation. (c) Coalescence of cavities to form a crack. (d) Crack propagation. (e) Final shear fracture at a 45 ° angle relative to the tensile direction. cup-and-cone fracture in tension Particles serve as void nucleation sites.
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Mechanical Failure – Chapter VIII Scanning electron fractograph showing spherical dimples characteristic of ductile fracture resulting from uniaxial tensile loads. Scanning electron fractograph showing parabolic-shaped dimples characteristic of ductile fracture resulting from shear loading. Features of Ductile Fracture Surfaces
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Mechanical Failure – Chapter VIII Brittle fracture Photograph showing V-shaped ‘‘chevron’’ markings characteristic of brittle fracture. Arrows indicate origin of crack. Photograph of a brittle fracture surface showing radial fan- shaped ridges. Arrow indicates origin of crack.
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Mechanical Failure – Chapter VIII Scanning electron fractograph of ductile cast iron showing a transgranular fracture surface. Scanning electron fractograph showing an intergranular fracture surface. Transgranular fracture Intergranular fracture
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Mechanical Failure – Chapter VIII Transgranular fracture Intergranular fracture
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Mechanical Failure – Chapter VIII Stress concentration (a) The geometry of surface and internal cracks. (b) (b) Schematic stress profile along the line X–X in (a), demonstrating stress amplification at crack tip positions.
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2007-MECH141-08%20Failure.pdf(hit)___2007-MECH141-08%2BFailure

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