Quiz - Structural Instabilities | ANSYS Innovation Courses

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Question 1 of 10

1. Question
Which of the following statements best characterizes structural instability?
- 1) Structure undergoes very large change in displacement for very small change in applied force
- 2) Components yield after applying a small amount of force
- 3) Large deformation for the applied load
- 4) Structure fails with crack propagation
Question 2 of 10

2. Question
Consider a ball resting on the flat surface is this structure, it is in _______ status.
- 1) Stable
- 2) Neutral
- 3) Unstable
- 4) None of the above
Question 3 of 10

3. Question
Which curve tells us when a structure is becoming unstable?
- 1) Stress vs. strain curve
- 2) S-N curve
- 3) Force vs. deflection curve
- 4) All of the above
Question 4 of 10

4. Question
What happens to a structure when the force-deflection curve is in the softening part?
- 1) The structure has buckled and has become unstable and will fail
- 2) The structure has buckled but reaches a different stable configuration where it can take further load
- 3) The structure has shown plastic deformation and will carry more load
- 4) All of the above
Question 5 of 10

5. Question
When designing a short column, the limit load predicted by Eigenvalue buckling analysis is generally:
- 1) Aggressive i.e. predicts a higher failure load than reality
- 2) Close to reality
- 3) Conservative i.e. predict a lower failure load than reality
- 4) None of the above
Question 6 of 10

6. Question
When designing slender columns, the limit load prediction by large deflection nonlinear analysis is generally:
- 1) Aggressive i.e. predicts a higher failure load than reality
- 2) Close to reality
- 3) Conservative i.e. predict a lower failure load than reality
- 4) None of the above
Question 7 of 10

7. Question
Eigenvalue analysis predicts multiple limit loads and buckling modes for a given load condition. Typically the first mode gives the lowest load at which buckling may occur. As a designer what would be your concern?
- 1) Ensure the load on structure does not cross the limit load predicted by the first mode
- 2) Ensure that load on structure does not cross the sum of all the limit loads of all modes
- 3) Change the direction of the load so the predicted modes won't occur at all
- 4) All of the above
Question 8 of 10

8. Question
When designing for buckling what is an important factor to keep in mind?
- 1) Take into account possible initial geometric imperfections in the structure as this may affect the limit loads drastically
- 2) Is the area earthquake prone?
- 3) Make sure the structure does not reach yield point
- 4) All of the above
Question 9 of 10

9. Question
Which of the following statements is true about critical speed in a rotating structure?
- 1) It can cause resonance of the mounting base
- 2) The system experiences increasing amplitude of vibration when a rotating structure is under critical speed
- 3) It is a speed an engineer should avoid when designing the structure
- 4) All of the above
Question 10 of 10

10. Question
Which of the following could cause dynamic instability?
- 1) Improper distribution of the mass
- 2) Misalignment of rotating equipment
- 3) Excitation of an undamped system at resonance
- 4) All of the above

Quiz - Structural Instabilities

Quiz - Structural Instabilities

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