quiz 5 solution

quiz 5 solution - 3 R FL fs π σ = 2 True or False(12 pts...

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Name: Solution __ - 1 - MSE 230 (Spring 2008) Quiz #5 (30 pts) 1. Stress-strain Curve of Ceramics (10 pts) A ceramic, ZrO 2 , has a theoretical density of 6 g/cm 3 . A cylinder of ZrO 2 , formed by pressing a powder of ZrO 2 in a die at room temperature, has a measured density of 3.2 g/cm 3 . On one plot, sketch the stress-strain curve of the 3.2 g/cm 3 ZrO 2 and a fully dense 6 g/cm 3 ZrO 2 . 2. Flexural Strength Calculation (8 pts) A circular specimen of MgO is loaded using a three-point bending mode. Calculate the minimum possible radius of the specimen without fracture, given that the applied load is 5560 N, the flexural strength is 105 MPa, and the separation between load points is 45 mm. (
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Unformatted text preview: 3 R FL fs π σ = ) 2. True or False (12 pts) Ceramics are more difficult to form than metals due to the high melting temperature as well as b r i t t l e n e s s . ( T r u e / F a l s e ) The main general differences between metals and ceramics are that ceramics have a higher K IC , a higher CTE and lower electrical conductivity. (True / False) The basic unit of the silicates is the SiO 4 4-tetrahedron. Various silicate structures arise from the different arrangements of the tetrahedron unit. (True / False) Viscosity is a measure of glassy material’s resistance to deformation. (True / False) σ ε 6 g/cm 3 ZrO 2 3.2 g/cm 3 ZrO 2...
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