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Machine Design

Machine Design for GATE Mechanical Engineering, one topic per lesson: the theory in plain words, the formulas, a solved example, and GATE-style questions (MCQ, MSQ and NAT) whose numerical answers are recomputed by a program when the site is built.

Start the first lesson

1Design Basics

  1. Design for Static Loading and Failure TheoriesFactor of safety, stress concentration, design of members under static loads using Tresca and von Mises theories, and the choice of theory for ductile and brittle materials.
  2. Fatigue, Endurance Limit and Goodman LineFluctuating stresses, S-N curve and endurance limit, modifying factors, fatigue stress concentration and notch sensitivity, and Goodman, Soderberg and Gerber criteria.

2Joints and Shafts

  1. Bolted, Riveted and Welded JointsDesign of bolted joints, bolt preload and stiffness, riveted joint efficiency, eccentrically loaded joints, and strength of butt and fillet welds with solved examples.
  2. Shafts, Keys, Couplings and BearingsShaft design for strength and rigidity, keys and couplings, rolling contact bearing life and equivalent load, and sliding bearings with Petroff's equation and Sommerfeld number.

3Power Transmission Elements

  1. Gear Design, Brakes and ClutchesLewis bending equation and wear strength of spur gears, gear forces, friction clutches under uniform pressure and uniform wear, and block, band and disc brakes.