1 Endurance strength is always associated with A. Tensile load D. Fatigue loads
ID: 1767207 • Letter: 1
Question
1 Endurance strength is always associated with A. Tensile load D. Fatigue loads C. Compression loads D. Static loads 2) Select a failure prediction method that would be a "good predictor" for ductile materials loaded with biaxial or triaxial stresses. A. Maximum shear stress method B. Modified Mohr's circle method C. Gerber fatigue failure method D. Distortion energy method Fatigue failure tends to occur more frequently in larger components due to: A. Larger components tend to have more defects that could turn into cracks. 3.) B. Larger components tend to have greater loads placed upon them. C. Larger components tend to be made out of weaker materials. D. Larger components have greater inertial resistance and thus don't like to move as casily ) Most often machine components fail by: A. Creep B. Fatigue C. Buckling D. AllExplanation / Answer
1. Answer : (B.) Fatigue loads.
Explaination: The endurance strength of a material is its ability to withstand fatigue loads. Endurance strength is often plotted in S-N diagram where it shows the stress level that a material can survive for given number of cycles.
2. Answer: (D.) Distorsion energy theory.
Explaination: There are two theories for ductile material, one is maximum shear stress theory and other is distorsion energy thoery but in comparision of maximum shear stress theory, distorsion energy theory gives more approximate result.
3. Answer: (A.) Larger components tend to have more defects that could turn into crack.
Explaination: Larger components have more defects which causes larger stress concentration factor that could turn it into cracks.
4. Answer: (D.) All
Explaination: All the phenomenon given are the factors cause machine components to failure, Creep is time dependant deformation, fatigue is due fluctuating load and buckling is due to axial compressive stress.
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