1. Solution to MCQ
Question: A localized compressive stress at the area of contact between two members is known as ____________.
Correct Option: C) crushing stress
Justification: Crushing stress (also commonly known as bearing stress) occurs when two surfaces are pressed against each other. It is a localized compressive stress that acts at the surface of contact, such as where a bolt presses against the side of a hole in a plate or where a column base rests on a pedestal. Unlike simple axial compression which acts throughout the body, this is specific to the contact interface.
2. Additional High-Yield MCQs from Source (Syllabus 1.2: Stresses and Strains)
1. The direction of normal stress is:
A) parallel to failure plane
B) perpendicular to failure plane
C) both (a) and (b) above
D) none of the above
Correct Answer: B
2. The direction of shear stress is:
A) parallel to failure plane
B) perpendicular to failure plane
C) both (a) and (b) above
D) none of the above
Correct Answer: A
3. When a body is subjected to two equal and opposite pulls, as a result of which the body tends to extend its length, the stress and strain induced is:
A) compressive
B) tensile
C) shear
D) volumetric
Correct Answer: B
4. When a body is subjected to two equal and opposite pushes, as a result of which the body tends to shorten its length, the stress and strain induced is:
A) compressive
B) tensile
C) shear
D) volumetric
Correct Answer: A
5. The stress which acts in a direction tangential to the area of cross-section is:
A) normal stress
B) shear stress
C) crushing stress
D) bending stress
Correct Answer: B
6. Working stress is the ratio of:
3. Core Theoretical Concepts: Types of Stresses (Syllabus 1.2)
Normal Stress: Acts perpendicular to the cross-section of a member. It is further divided into:
Shear Stress (Tangential Stress): Acts parallel to the surface of the cross-section. It is caused by forces that tend to slide one part of the body over the other.
Crushing/Bearing Stress: A specific type of localized compressive stress that occurs at the contact surface between two separate members. It is calculated as the load divided by the projected contact area.
Bending Stress: Internal resistance developed in a beam when it is subjected to a bending moment, resulting in tension on one side of the neutral axis and compression on the other.
Volumetric Strain: The ratio of change in volume to the original volume when a body is subjected to a system of forces in all directions.
Hooke’s Law: For most materials, stress is directly proportional to strain within the elastic limit. The constant of proportionality for normal stress is the Modulus of Elasticity ($E$).
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