Virtual Lab Fatigue Test
- Fatigue Test Quiz - Answers
- 1. Fatigue
- 2. Stress ratio
- 3. S-N Curve
- 4. Fatigue limit
- 5. Notched specimen
- 6. Random load test
- 7. Shell or beach markings
- 8. Notch factor
- 9. A complete reversal of stress
- 10. Number of cycles to failure
- 11. A notched specimen
- 12. Low-cycle
- 13. Intermediate-cycle
- 14. High-cycle
- 15. Stress-controlled test
- 16. Strain-controlled test
- 17. Random load
- Fracture Test Quiz and Answers
- 1. A failure under repeated load is called _______________.
Answer. fatigue
2. The ratio of minimum to maximum stress is called _____________.
Answer. stress ratio
3. A plot of applied constant stress amplitude vs. number of cycles to failure is called __________.
Answer. S-N Curve
4. The stress amplitude below which no fatigue damage takes place is called ___________________.
Answer. fatigue limit
5. A specimen notched for a stress concentration is called __________________.
Answer. notched specimen
6. A test in which stress amplitudes vary randomly is called _________________.
Answer. random load test
7. Lines formed on a fracture surface, indicating that the crack moved in spurts under random loads is called ________.
Answer. shell or beach markings
8. The ratio of the stresses for smooth and notched specimens on an S-N curve at a fixed number of cycles to failure is called _____.
Answer. notch factor
9. A stress ratio of R = -1 signifies ________________.
Answer. a complete reversal of stress
10. Stress amplitude and fatigue life are related by _______.
Answer. number of cycles to failure
11. Which has a shorter fatigue life, a notched or a smooth specimen?
Answer. A notched specimen.
12. If number of cycles to failure is less than 1000, _________ fatigue occurs.
Answer. low-cycle
13. If number of cycles to failure is between 1000 and 1 million, _________ fatigue occurs.
Answer. intermediate-cycle
14. If number of cycles to failure is greater than 1 million, _________ fatigue occurs.
Answer. high-cycle
15. The test in which the applied stress is kept constant and the strain increases in each cycle is called ______ test.
Answer. stress-controlled test
16. The test in which the strain is kept constant and the stress varies in each cycle is called ______ test.
Answer. strain-controlled test
17. Crack propagates in spurts in ___________ tests.
Answer. random load
