Machine Design

What you'll learn

• Apply the machine design process to write functional specifications, choose design factors from the uncertainty and consequences of failure, and estimate component and system reliability with the stress-strength interference model.
• Determine principal stresses and apply the maximum shear stress and distortion energy theories to ductile parts and the Coulomb-Mohr and modified Mohr theories to brittle parts, with stress concentration factors where they apply.
• Estimate the endurance limit and S-N line of steel parts using Marin factors, and find fatigue stress concentration factors from notch sensitivity.
• Evaluate fluctuating stresses with the Goodman, Soderberg, Gerber and ASME-elliptic criteria, check first-cycle yield, and estimate life under variable loading with Miner's rule.
• Lay out and size shafts for fatigue with the DE-Goodman equation, calculate deflection, slope and critical speed, and select keys and couplings.
• Select rolling-element bearings from the load-life relation, equivalent loads, application factors and reliability factors, and specify fits and lubrication.
• Analyze hydrodynamic journal bearings with Petroff's equation, the Sommerfeld number and short-bearing theory, and judge the effect of oil grade and temperature.
• Calculate spur gear geometry, contact ratio, interference limits, kinematics and tooth forces.
• Rate spur gear teeth for bending and pitting with the Lewis equation and AGMA-style factors, and compare bending and contact safety factors correctly.
• Analyze helical, bevel and worm gears and simple, compound and planetary gear trains, including thrust loads, efficiency and self-locking.
• Design preloaded bolted joints with metric and inch fasteners, including stiffness, joint constant, preload, tightening torque, separation and fatigue.
• Design helical compression springs and fillet-welded joints, and assemble a design review that records each element's governing check and assumptions.