Quiz - Metal Plasticity

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Quiz - Metal Plasticity

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Question 1 of 10

1. Question
Which statement best characterizes ductile materials?
- 1) Poisson's ratio is typically 0.50
- 2) Failure is sudden and often unpredictable with little deformation
- 3) Strength is not lost suddenly, but gradually and over a large deformation
- 4) Stress vs strain is a straight line
Question 2 of 10

2. Question
Hooke's law best describes:
- 1) Linear relationship between stress and strain
- 2) The ratio between volumetric stress and Von-Mises stress
- 3) Nonlinear relationship between stress and strain
- 4) Relationship between surface hardness and radiation exposure
Question 3 of 10

3. Question
One important feature of plastic behavior is
- 1) Strain energy is completely recoverable
- 2) Only deviatoric strain is recoverable but volumetric strain is not
- 3) Strain energy is unrecoverable
- 4) It applies only to metal
Question 4 of 10

4. Question
Plasticity is caused by
- 1) Slip between planes of atoms due to shear (deviatoric) stress
- 2) High volumetric pressure
- 3) Extraterrestrial planetary forces
- 4) Aging of the material
Question 5 of 10

5. Question
Which description about yield surface is true?
- 1) The boundary on the yield surface is at the brink of yielding
- 2) It is a physical surface on an object that causes it to yield
- 3) The size of an yield surface does not change because it is a material property
- 4) Retrieving data. Wait a few seconds and try to cut or copy again.
Question 6 of 10

6. Question
Which of the following hardening criteria can capture plastic behavior more accurately in cyclic loading of a metal?
- 1) Isotropic Hardening
- 2) Kinematic Hardening
- 3) Both criteria can capture hardening behavior accurately
- 4) Neither criteria can capture hardening behavior accurately
Question 7 of 10

7. Question
Which of the following statements about isotropic hardening is true?
- 1) With isotropic hardening, the stress no longer increases after a material reaches yield point
- 2) With isotropic hardening, the yield surface expands uniformly in radial direction
- 3) It is rare for metal to exhibit hardening
- 4) Ignoring Isotropic hardening is too aggressive for a design
Question 8 of 10

8. Question
Which of the following statements about kinematic hardening is true?
- 1) It is not accurate for cyclic loading scenario
- 2) The yield surface expands during kinematic hardening
- 3) It requires high kinematic energy
- 4) It causes the yield surface to shift
Question 9 of 10

9. Question
Which of the statements is true about yield point in a material?
- 1) The material enters plasticity after it passes the yield point
- 2) Stress-strain curve before the yield point is linear
- 3) The corresponding stress is called yield strength
- 4) All of the above
Question 10 of 10

10. Question
Which of the statements is true about yield surface?
- 1) The Von-Mises stress can go above the yield surface
- 2) Once the von-mises stress reaches the yield surface, the material is in plastic range
- 3) More parameters are needed to determine whether this point yields or not
- 4) Von-Mises stress is not needed to determine whether this point yields or not