Steel of yield strength 400 MPa has been used in a structure. What is the value of the maximum allowable tensile strength?a)240 MPab)200 MPac)120 MPad)96 MPaCorrect answer is option 'A'. Can you explain this answer?

Question

Answer

To determine the maximum allowable tensile strength of a steel with a yield strength of 400 MPa, it is important to understand the concept of yield strength and the safety factor typically applied in engineering design.

1. Understanding yield strength:
Yield strength is the stress at which a material begins to deform plastically, meaning it undergoes permanent deformation without fracturing. It represents the maximum amount of stress a material can withstand before it starts to lose its elastic properties.

2. Safety factor:
In engineering design, a safety factor is applied to account for uncertainties and variations in material properties, manufacturing processes, and loads. It ensures that the structure can safely carry the expected loads without failure. The safety factor is typically greater than 1, indicating that the maximum allowable stress is lower than the yield strength.

Now, let's calculate the maximum allowable tensile strength:

3. Calculation:
To determine the maximum allowable tensile strength, we need to apply a safety factor to the yield strength. Let's assume a safety factor of 0.6.

Maximum allowable tensile strength = Safety factor * Yield strength
= 0.6 * 400 MPa
= 240 MPa

Therefore, the maximum allowable tensile strength for a steel with a yield strength of 400 MPa, considering a safety factor of 0.6, is 240 MPa. This means that the structure should not be subjected to tensile stresses exceeding 240 MPa to ensure its safety.

Hence, the correct answer is option A) 240 MPa.

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