Stress and Local Equilibrium

Intro to Stress – Lesson 1

Stress Tensor – Lesson 2

Principal Stress – Lesson 3

Equivalent Stress – Lesson 4

Local Equilibrium – Lesson 5

Application of Learning about Stress – Lesson 6

Homework, Quizzes, Simulation Examples – Stress and Local Equilibrium – Lesson 7

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Quiz - Stress and Local Equilibrium

Stress and Local Equilibrium – Summary – Lesson 8

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Quiz - Stress and Local Equilibrium

Stress and Local Equilibrium Homework, Quizzes, Simulation Examples – Stress and Local Equilibrium – Lesson 7 Quiz - Stress and Local Equilibrium

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Question 1 of 6

1. Question
Which of the following statements about stress is/are true?
- 1) Stress and strain relationship is always linear
- 2) Stress tensor is symmetric
- 3) Stresses are independent of external load
- 4) Internal force is the only cause of stress
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Question 2 of 6

2. Question
Which of the following statements about principal stress is/are true? (Select all applicable)
- 1) Principal stress is independent of the coordinate system
- 2) There is no shear stress in the principal stress coordinate system
- 3) Normal stress failure criterion uses the first principal stress
- 4) Ductile material failure is controlled by principal stress
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Question 3 of 6

3. Question
Which of the following statements about equivalent stress is/are true?
- 1) Equivalent stress value changes when the coordinate system changes
- 2) Equivalent stress is independent of pressure
- 3) The expression of equivalent stress can be plotted as an ellipse in the principal coordinate system
- 4) Equivalent stress is a vector
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Question 4 of 6

4. Question
Which of the following statements about local equilibrium is/are true?
- 1) There is a total of three force balance equations in three axes of a coordinate system
- 2) The stress rate of change is negligible when calculating the local equilibrium because the infinitesimal cube is so small
- 3) The divergence of stress is a scalar
- 4) The divergence of stress should equal to the internal force at a point
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Question 5 of 6

5. Question
Providing the three principal stresses of a point are 10MPa, 2MPa, -4MPa, what is the equivalent stress at that point?
- 1) 12.16 MPa
- 2) 7.21 MPa
- 3) 8.61 MPa
- 4) 11.45 MPa
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Question 6 of 6

6. Question
What information is needed to describe a solid mechanical problem?
- 1) Boundary condition
- 2) Description of deformation
- 3) Stress-strain relationship
- 4) Local force balance
- 5) All of above
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