Topic: Strength of Materials
Consider the following statements related to stress and strain :
1. Shear stress is always tangential to the face over which it acts.
2. Shear stresses on the transverse pair of faces are known as complimentary shear stresses.
3. Shear strain is defined as the change in the right angle of the element measured in radians.
Which of the above statements is correct?
- A. 1 and 2 only
- B. 1 and 3 only
- C. 2 and 3 only
- D. 1, 2 and 3
Answer: D. 1, 2 and 3
Explanation: 1. Shear stress is defined as the stress component parallel (tangential) to a given surface.
2. To maintain rotational equilibrium, a shear stress on one face must be accompanied by an equal shear stress on an adjacent transverse face, called complimentary shear stress.
3. Shear strain represents the distortion of the element and is measured by the change in the original right angle (in radians). All three statements are correct.