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EMA4223 HW 9 Solutions - 9.1 A Charpy machine with a hammer...

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9.1 A Charpy machine with a hammer weighing 200N has a 1-m long arm. The initial height h o is equal to 1.2m. The Charpy specimen, (See Figure 9.2), absorbs 80J of energy in the fracturing process. Determine: (a) The velocity of the hammer upon impact with the specimen. (b) The velocity of the hammer after breaking the specimen. (c) An average strain rate in the specimen (d) The final height attained by the specimen From part (b)
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9.6 A thermoplastic polymer has a plane-strain fracture toughness K Ic =15MPa m 1/2 and a yield strength σ y = 80MPa. Estimate the requirements for dimensions of a fracture toughness specimen for this sample.
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Which means that 9.11 Norton NC-132 hot pressed Si 3 N 4 has the following tensile strengths for the given tests: Three-point bending: 930 MPa Four-point bending: 720 MPa Uniaxial tension: 550 MPa Larger measured failure stresses mean smaller flaw sizes were seen in the sample, therefore the largest flaws were seen in the uniaxial tension test while smaller flaws led to
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