What is the E value of steel?

What is the E value of steel?

• A. 25 Million
• B. 29 Million
• C. 34 Million
• D. 29 Thousand

Answer: (B)

Young's modulus, E, is a measure of a material's stiffness—the stress required to produce a given amount of elastic strain. For steel, E is about 200 GPa, which converts to roughly 29,000 ksi, or about 29 million psi. That's why the option showing 29 million is the best match: it reflects the standard stiffness value for steel in psi units. The 29 thousand psi is far too small for steel (about 0.2 GPa), and the 25 million and 34 million psi options fall outside the typical range for steel’s E (they imply values around 170–240 GPa, with 200 GPa being the common reference).

Young's modulus, E, is a measure of a material's stiffness—the stress required to produce a given amount of elastic strain. For steel, E is about 200 GPa, which converts to roughly 29,000 ksi, or about 29 million psi. That's why the option showing 29 million is the best match: it reflects the standard stiffness value for steel in psi units. The 29 thousand psi is far too small for steel (about 0.2 GPa), and the 25 million and 34 million psi options fall outside the typical range for steel’s E (they imply values around 170–240 GPa, with 200 GPa being the common reference).