Question

The yield point in fatigue loading compared to that in static loading is less. The ratio of ultimate tensile strength to endurance limit of a material subjected to fatigue loading is

• A. 0.5
• B. 1
• C. 1.5
• D. 2

Hint:

For many ductile materials, the endurance limit is roughly half of the ultimate tensile strength, leading to a ratio of about 2.

Answer 1

The Correct Option is D

Step 1: Understanding Fatigue Loading and Endurance Limit Fatigue loading refers to the repetitive application of stress or strain that can lead to failure at stress levels lower than the material’s yield strength under static conditions. Step 2: Definition of Endurance Limit The endurance limit (or fatigue limit) is the maximum stress level a material can endure for an infinite number of cycles without failure. For most ductile materials, it is typically \(\frac{1}{2}\) of the Ultimate Tensile Strength (UTS). Step 3: Ratio of UTS to Endurance Limit \[ \text{Ratio} = \frac{\text{Ultimate Tensile Strength}}{\text{Endurance Limit}} = \frac{\text{UTS}}{0.5 \cdot \text{UTS}} = 2 \]