And then, in a small note at the bottom of a page—something he’d skipped for months—Khurmi had written in italics: “In practical design, stress concentration at the fixed support often doubles the nominal stress. Always check the joint detail.”
“Thank you, sir,” he whispered.
Step by step, he followed Khurmi’s method. First, find the reaction. Then the shear force diagram. Then the maximum bending moment at the fixed end. He calculated the moment of inertia for a square section. Then the section modulus. Then stress. R S Khurmi Strength Of Materials
The book fell open at a familiar diagram—a beam with an overhang, arrows indicating point loads. Underneath, in Khurmi’s characteristically crisp, no-nonsense language, were solved examples. No fluff. Just theory, followed by a wall of problems labeled “Example 6.12,” “Example 6.13,” each more twisted than the last.
He redrew his beam. He listed the given data: Length 2 m, load 500 N at free end, cross-section 50x50 mm. He turned to the section on Cantilevers . There it was: Bending stress = (M * y) / I . And then, in a small note at the
It was 10 PM, and the only light in Arjun’s hostel room came from a flickering tube light and the dull glow of a well-thumbed book: A Textbook of Strength of Materials by R. S. Khurmi. The cover was taped together, the pages were coffee-stained, and the spine had given up years ago. For mechanical engineering students across India, this book wasn't just a text—it was a rite of passage.
Arjun froze. He had assumed a perfect weld. But his actual support had a sharp internal corner—a classic stress raiser. He added the stress concentration factor from Table 14.3. The theoretical stress doubled. Then he applied the factor of safety. The beam would fail at 80% of the rated load. First, find the reaction
“Factor of safety,” he muttered, and flipped to Chapter 14: Theories of Failure .