Question

Stress on materials that leads to dimensional shortening is termed:

• A. Flexural stress
• B. Shear stress
• C. Tensile stress
• D. Compressive stress

Hint:

Compressive stress is essential in understanding material behavior under load, particularly in structures designed to carry weight.

Answer 1

The Correct Option is D

Step 1: Understanding stress types.
Compressive stress occurs when materials are subjected to forces that compress or shorten the material. This type of stress leads to the dimensional shortening of the material along the direction of the applied force.

Step 2: Analyzing the options.
(A) Flexural stress: Flexural stress is associated with bending of materials, not shortening.
(B) Shear stress: Shear stress involves forces that cause one part of a material to slide past another, but it does not lead to dimensional shortening.
(C) Tensile stress: Tensile stress causes materials to stretch or elongate, not shorten.
(D) Compressive stress: Correct — Compressive stress leads to dimensional shortening of materials.

Step 3: Conclusion.
The correct answer is (D) Compressive stress, as it causes dimensional shortening.

Answer 2

Each stress type can be identified from the direction of the applied force relative to how the material deforms, which gives another route to the same answer.

1. Flexural stress: Arises from bending, where one face of the material stretches and the opposite face shortens simultaneously, not a pure shortening of the whole section.
2. Shear stress: Arises from forces acting parallel to a surface, causing layers to slide past each other, changing shape/angle rather than length.
3. Tensile stress: Arises from forces pulling a material apart along its axis, causing it to elongate, the opposite of shortening.
4. Compressive stress: Arises from forces pushing a material together along its axis, directly causing the material to shorten along that direction, matching the question's description exactly.

Since only pushing forces along an axis produce a straightforward reduction in length, compressive stress is the type described.

Therefore, the correct answer is Compressive stress.