02 - Engineering Materials and their Properties

02 Engineering - Engineering Materials and heir Properties Manufacturing Processes Spring 2011 Prof T Özel Their Properties Manufacturing

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Unformatted text preview: Engineering Materials and heir Properties Manufacturing Processes Spring 2011 Prof. T. Özel Their Properties Manufacturing Processes Net shape processes • Bulk Deformation (Forging, Rolling, Extrusion, Drawing) • Sheet Metal Forming (Shearing, Bending) • Metal Casting • Polymer Processing (Injection Molding) • Powder Metallurgy Removal processes • Cutting w/ single point tools (Turning, Boring, Grooving) • Cutting w/ multiple point tools (Drilling, End Milling, Face Milling) • Abrasive Machining Processes- (Grinding) Manufacturing Processes Spring 2011 Prof. T. Özel • Ceramic and Glass Forming • Non-traditional Machining- (Laser cutting, EDM, etc.) Additive processes • Selective laser sintering (SLS) • Stereolithography (SLA) • 3-D Printing • Laminated object manufacturing (LOM) • Fused deposition modeling FDM) • Shape deposition modeling (SDM) Joining • Welding, Brazing, Soldering • Adhesion (Glue, Epoxy...) • Mechanical Fastening Engineering Materials Manufacturing Processes Spring 2011 Prof. T. Özel Mechanical Properties of Solids • Most manufacturing processes include “shaping” in liquid (casting, injection molding) or solid state (forming, machining). • In this class, emphasis is on solid state shaping, i.e. Manufacturing Processes Spring 2011 Prof. T. Özel deformation and machining processes. • Knowledge of the mechanical behavior of materials in solid state is essential to understand and design forming and machining processes. Modes of deformation L A L τ a A 1 A , l 0 = initial cross section and length A 1 , l 1 = final cross section and length A, l = instantaneous cross section and length Manufacturing Processes Spring 2011 Prof. T. Özel Uniform Tensile Uniform Compression Shear L L l A A 1 τ l 1 l l 1 b γ Engineering Stress and Strain Engineering Stress (based on original dimensions) l S L A = load Initial Cross section ( Degree of deformation ) Manufacturing Processes Spring 2011 Prof. T. Özel Engineering Strain (based on original dimensions) e is positive in tension and negative in compression Engineering Shear Strain 1 1 l l l l dl e l dl de l- = = → = ∫ b a = γ Tensile Test Fixture Fixed Crosshead Specimen Column F Manufacturing Processes Spring 2011 Prof. T. Özel Base and Actuator Table Moving Crosshead F v Sheet Metal Tensile Test Specimen z t o w o Manufacturing Processes Spring 2011 Prof. T. Özel y Tensile Test Specimen + + A B B G W C T L Manufacturing Processes Spring 2011 Prof. T. Özel G gage length 2.00+/-0.005” W width 0.500+/-0.010” T thickness material thickness R radius of fillet (min) 1/2” L overall length (min) 8” A reduced section length (min) 3” B length of grip section (min) 2” Tensile Test Ultimate Tensile Strength (UTS) ( Highest stress reached prior to fracture ) Yield Point E= σ /e Modulus of elasticity Area represents how much elastic energy material can store Manufacturing Processes Spring 2011 Prof. T. Özel Ductility Stress-strain curve...
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This note was uploaded on 09/20/2011 for the course ENG 303 taught by Professor Any during the Fall '08 term at Rutgers.

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02 Engineering - Engineering Materials and heir Properties Manufacturing Processes Spring 2011 Prof T Özel Their Properties Manufacturing

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