Introduce the structural design of machine parts considering the operating loads, constraints and properties of materials. Define selection criteria for the main machine elements .
Strength of materials
Introduction to machine design, Machine design criteria with applications
Dimensioning of the main mechanical components
Introduction to structural design, safety, safety factor, Technical Standards
Mechanical tests on materials, tensile, hardness, impact, fatigue, fracture, metallic materials (steel, cast iron, aluminum alloys, magnesium, titanium, non-metallic materials (polymers and ceramics), Manufacturing technology , Selection criteria.
Load analysis, statics, application of the beam model in mechanics, axial load, bending load, shear load torsion. Stress and strain. Mohr circles. Principal stresses, Strength criteria (Tresca, Von Mises, Rankine), ductility and brittleness. Compression instability and Eulerian load. Stiffness. Notches and stress concentration, nominal stress and local stress, stress concentration factor Kt, Conforming and non-conforming contacts, specific contact pressure, Hertzian theory, Contact stresses. Thermal expansion.
Fatigue of metallic materials, characteristics of the phenomenon, fatigue experiments , fatigue limit, S / N curves , fatigue parameter estimates, influencing factors, mean stress effect, fatigue damage accumulation, multiaxial stress effect, notch sensitivity, notch factor Kf . Contact fatigue, pitting, fretting.
Fixed connections , welding and bonding, technical standards, welded joint design, weld types.
Non permanent connections, screws, bolts, rivets and nails, rules for threaded connections, load transmission in shear or by friction, bolted connections, preload, stiffness of the parts and load distribution, Fatigue loading , self-locking devices.
Mechanical power transmission: axes and shafts, materials, construction details, sizing and verification, shaft-hub connections, gears, pulleys. Rolling bearings, types (rolls, balls) and load capacity, mounting, bearing selection from the catalog. Bearings, examples, materials testing. Power screws: Examples and thread types, checks.
Springs, fields of use, types, stiffness.
Shigley Machine design
Manfredi De Paulis, Costruzione di macchine
Lectures and Excercises
Open book written test and oral exam
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