Transcription of General Engineering Principles I.
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General Engineering Principles I.
General Engineering Principles ISealed Source & Device WorkshopGeneral Engineering Principles I: 1 General Engineering Principles IForces:Tensile and Compressive: Tensile (Tension) - pulling apart Compressive (Compression) - pushing together Forces may be direct, or may be caused by changes in pressure, temperature, or combined : Force perpendicular to the primary Source & Device WorkshopGeneral Engineering Principles I: 2 General Engineering Principles IStrength: Stress = Force/Area (psi or Pa) Strain = Elongation under stress =change in length/original length (in /in )length/original length ( ) Ultimate Strength: maximum stress sustained without breaking - exceed this limit and the material will break. Yield Strength: maximum stress sustained without permanent deformation - the material will stretch and come back to its original Source & Device WorkshopGeneral Engineering Principles I: 3 General Engineering Principles IStress vs. Strain:Sealed Source & Device WorkshopGeneral Engineering Principles I: 4 General Engineering Principles IStrength (cont.)
right angles to the longitudinal stress It is foundright angles to the longitudinal stress. It is found that for elastic metals the lateral strain is proportional to the longitudinal strain, and is of ... bth ld k b l t ti iby the cold work or by unequal contractions in a casting. • The process involves heating slowly, and holding at a ...
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