Mechanical Metallurgy Practice Test 6

1. The value of J integral in potential energy term is written as J=dU_o/da=K²/E’. The value of E’ in case of plane stress is equal to ______ (where v is the poison’s ratio).

2. The stress ratio is defined as the ________

3. The amplitude ratio is defined as the ___________

4. Among the given mechanical test, the highest number of samples are required in __________

5. The stress intensity factor at local crack tip is proportional to __________

6. The Dimension of the stress intensity factor K is __________

7. Which of the following does not play a role in fatigue failure?

8. When equipment fails much before the required stress to the fracture, it is called ______

9. For the evaluation of J-integral value from the compact tension specimen, the amount of J in the below-shown sample is equal to __________
Where A = area under the load vs. displacement curve
b=W-a
B=Specimen thickness

10. Of the total failure of all the industrial components, the fatigue fracture accounts for how much percentage of fault?