Engineering, 02.12.2019 20:31 kebo63

The manufacturer of a product that is subjected to repetitive cycles has specified that the product should be removed from service when any crack reaches 15% of the critical crack length required to cause fracture. consider a crack that is initially 0.02 mm long in a material with a fracture toughness of 55 mpa √m . the product is continuously cycled between compressive and tensile stresses of 300 mpa at a constant frequency. assume external cracks for which f = 1.12. the materials constants for these units are n = 3.4 and c = 2 × 10-11.
(a) what is the critical crack length required to cause fracture?
(b) how many cycles will it take for the product to be removed from service as specified by the manufacturer,
(c) assuming the specifications were not followed, how many cycles will it take for product to fail? (2+3+3 = 8 points)

Answers: 3

Show answers

Another question on Engineering

Engineering, 04.07.2019 18:10

Asingle-geared blanking press has a stroke of 200 mm and a rated capacity of 320 kn. a cam driven ram is assumed to be capable of delivering the full press load at constant force during the last 15 percent of a constant-velocity stroke. the camshaft has an average speed of 90 rev/min and is geared to the flywheel shaft at a 6: 1 ratio. the total work done is to include an allowance of 16 percent for friction a) estimate the maximum energy fluctuation b) find the rim weight for an effective diameter of 1.2 m and a coefficient of speed fluctuation of 0.10

Answers: 1

Answer

Engineering, 04.07.2019 18:10

Thermal stresses are developed in a metal when its a) initial temperature is changed b) final temperature is changed c) density is changed d) thermal deformation is prevented e) expansion is prevented f) contraction is prevented

Answers: 2

Answer

Engineering, 04.07.2019 18:10

Draw the engineering stress-strain curve for (a) bcc; (b) fcc metals and mark important points.

Answers: 1

Answer

Engineering, 04.07.2019 18:10

A-mn has a cubic structure with a0 0.8931 nm and a density of 7.47 g/cm3. b-mn has a different cubic structure, with a0 0.6326 nm and a density of 7.26 g/cm3. the atomic weight of manganese is 54.938 g/mol and the atomic radius is 0.112 nm. determine the percent volume change that would occur if a-mn transforms to b-mn.

Answers: 2

Answer

You know the right answer?

The manufacturer of a product that is subjected to repetitive cycles has specified that the product...

Questions