1. What is the Resultant Load on Bolt?

The resultant load on a bolt is the total force acting on the bolt after tightening, which includes both the initial pre-load and any additional external forces applied during service. This is crucial for ensuring bolt integrity and joint reliability.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( P_b \) — Resultant Load on Bolt (N)
• \( P_i \) — Pre Load in Bolt (N)
• \( \Delta P \) — Load due to External Force on Bolt (N)

Explanation: The formula simply adds the initial pre-load tension in the bolt to any external force applied to calculate the total resultant load.

3. Importance of Resultant Load Calculation

Details: Accurate calculation of resultant load is essential for determining bolt safety, preventing failure, and ensuring proper joint performance under operational conditions.

4. Using the Calculator

Tips: Enter pre-load and external load values in Newtons (N). Both values must be non-negative.

5. Frequently Asked Questions (FAQ)

Q1: What is pre-load in a bolt?
A: Pre-load is the tension created in a bolt when it is tightened, which helps maintain joint integrity and prevent loosening.

Q2: Why is external force added to pre-load?
A: External forces applied during service contribute to the total load on the bolt, which must be accounted for to ensure it doesn't exceed the bolt's capacity.

Q3: What units should be used for input?
A: The calculator expects inputs in Newtons (N) for both pre-load and external load.

Q4: Are there limitations to this calculation?
A: This is a simplified calculation that assumes linear addition of loads. In complex scenarios with dynamic or alternating loads, more detailed analysis may be required.

Q5: How does resultant load affect bolt selection?
A: The resultant load must be less than the bolt's proof load or yield strength to prevent permanent deformation or failure.