The stress-strain behavior of ceramics is usually determined using: a. a tensile

Question

The stress-strain behavior of ceramics is usually determined using: a. a tensile test b. a compression test c. a bending test Ceramics have a disposition to fail by cracking because of: a. The difficulty for slip to occur (low to no plasticity) b. The higher density of flaws c. Their high melting points d. a and b In ceramics, strength: a. Is reliably the same in all samples b. Varies depending on sample size c. Varies depending on strain d. Is higher in compression than in tension e. b and d Glasses: a. Are non crystalline ceramics b. Deform by viscous flow c. Are often transparent d. All of the above The degree of polymerization is a measure of: a. The weight of one chain of polymer b. The weight of one repeat unit c. The number of repeat units in a polymer chain The weight average molecular weight and number average molecular weight are a. different measures of the molecular weight of the polymer b. the same number, just a different name c. the molecular weights of the repeat unit The bonds between 3 carbon atoms form an angle of: a. 55 degree b. 109 degree c. 180 degree d. random value When applying a stress to a viscoelastic polymer a. The strain increases instantaneously to a value equal to the stress divided by the Young's modulus b. The strain doesn't change c. The strain progressively increases and keeps increasing as long as the stress is being applied

Explanation / Answer

1. It is determined by compression test.

2.Option d.

Ceramic has no plasticity ( they are brittle) and have more flaws.

3.Option E.

Ceramic has higher compressive strength than tensile strength. It strength depends on the size of the sample.

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