1. (2 points) For fatigue loading with a combined stress state, such as both ben
ID: 1767505 • Letter: 1
Question
1. (2 points) For fatigue loading with a combined stress state, such as both bending and torsion, the stress that should be used in to evaluate fatigue life is the a. b. c. Von Mises stress First principle stress Maximum shear stress 2. (2 points) For variable loading with different load amplitudes, the approach frequently used to evaluate fatigue life is the a. b. c. Euler's Rule Palmgren-Miner Rule Principle of Moments 3. (2 points) The Goodman criteria is used for a. static loading b. dynamic loading c. both static and dynamic Joading 4. (2 points) Distortion Energy criteria is used for a. ductile materials under static loading b. brittle materials inder static loading c.both ductile and brittle materials under static loading 5. (2 points) Modified-Mohr criteria is used for ductile máterials under static loading brittle materials under static loading both ductile and brittle materials under dynamic loading a. b. c. 6. (2 points) The calculated values for the endurance limit modification factors (also called the Marin factors) a. b. c. Should be less than three. Should be less than one, or very close to one. May be negative.Explanation / Answer
1. for a fatigue loading with a combined stress state, such as aboth bending and torsion, the stress that should be used to evaluate fatigue life is the
ANS:a, everywhere it is better to go for Vonmises stresses
2.for a variable loading with different load amplitudes, the approach frequently used to evaluatefatigue life is the
ANS: a, Euler's rule
3.the goodman criteria is used for
ANS:a for staic loading it will use.
4.Distortion energy criteria is used for
ANS;ductile materials aunder static loading
5.Modified Mohr criteria is used for
ANS:C, both ductile and brittle materilas under dynamic loading
6.the calculated value for the endurance limit modification factors
ANS:b, should be less than one or very close to one.
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