Allowable Helical Torsional Stress Calculator

Material:

Wire Diameter (d):

Tensile Strength (MPa): Tensile Strength (bar): Tensile Strength (Pa): Tensile Strength (psi): Tensile Strength (torr): Allowable Stress (MPa): Allowable Stress (bar): Allowable Stress (Pa): Allowable Stress (psi): Allowable Stress (torr):

1. What is Tensile Strength of Spring Steel?

Definition: Tensile strength (S_ut) is the maximum stress that a material can withstand while being stretched or pulled before breaking.

Purpose: It is used to determine the load-bearing capacity of spring steel.

2. How Does the Calculator Work?

The tensile strength is calculated using the formula:

\[ S_{ut} = \frac{A}{d^{m}} \]

Variables:

\( A \): Material constant (from ASTM standards).
\( d \): Wire diameter (mm).
\( m \): Material exponent (from ASTM standards).

Explanation: The formula calculates the tensile strength based on the material properties and wire diameter.

3. Allowable Stress Calculation

The allowable stress \( S_y \) is calculated as:

\[ S_y = 0.78 \times S_{ut} \]

Explanation: The factor of 0.78 is used to account for safety and material variability in cold-drawn carbon steel.

4. Using the Calculator

Tips: Select the material and enter the wire diameter. Click "Calculate" to get the tensile strength and allowable stress.

Frequently Asked Questions (FAQ)

Q1: What is the significance of the material constants (A and m)?
A: The constants \( A \) and \( m \) are specific to the material and are used to calculate the tensile strength based on the wire diameter.

Q2: Can I use this calculator for other materials?
A: No, this calculator is designed specifically for the materials listed in the ASTM standards.

Q3: Why is the allowable stress calculated as 78% of the tensile strength?
A: The factor of 0.78 is used to account for safety and material variability in cold-drawn carbon steel.

Q4: What happens if I input zero for the diameter?
A: The calculator requires a positive diameter value. If zero is entered, the calculation will not proceed.

Q5: How accurate is this calculator?
A: The calculator provides accurate results based on the ASTM standards and input values. However, real-world conditions may introduce additional factors not accounted for here.

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