1. (2 points) For fatigue loading with a combined stress state, such as both ben
ID: 1767507 • 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
The stress that should be used is a) Von Mises stress. It is because there is combination of bending and torsion and the maximum stress is given using Von mises stress. The approach frequently used to evaluate fatigue life under variable amplitude loading using the damage accumulation hypothesis is b) Palmgren-Miner Rule. The Goodman criteria is used for b) dynamic loading . Distortion Energy criteria is used for a) Ductile materials which are biaxial. This method is also called Von mises Yield criterion. Modified Mohr criteria is used for b) brittle material under static loading . The marin factor should be b) less than one or very close to 1.
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