ENTC 181 Test 1 Notes

# ENTC 181 Test 1 Notes - Test 1 Notes-1 letter size front...

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Test 1 Notes -1 letter size front and back cheat sheet -bring calculator, ruler, pencil -need 4X11 inch scantron -Test Format -30 multiple choice questions (4 from DVD's) -Total Points: 60 -2 points each -10 multiple choice/short answer questions -Total Points: 40 -4 points each -1 optional problem -Total Points: 20 -Neatness/Organization -Total Points: 5 -Maximum Possible Points: 125 Symbols -average roughness: R_a -root mean square roughness: R_rms -normal stress: -shear stress: -shear strain: -shear strength: S_s -shear angle: -shear force: F_s(vector) -shear normal force: F_n(vector) -shear rate: -strain: -tensile strength: S_u -yeild strength: S_y -depth of cut: t_o -average chip thickness: t_c -top rake angle: -chip ratio: r -resultant force: R(vector) -friction force: F(vector) -friction normal force: N(vector) -friction angle: -thrust force: F_t(vector) -cutting force: F_c(vector) -cutting power: P_c -cutting speed: V -coeficent of friction: -material removal rate: MRR -unit power: P_u = U +specific energy (machining): P_u = U -feed (in/rev): f -feedrate (in/min): fr -angular speed (rad/s): -rotation speed (rpm): -length of cut (turning): L -depth of cut (turning): d -machining time: t -point angle: -grinding ratio: GR -surface temperature: T_s -unit conversion constant: K_2 -depth of grinding: d -grain aspect ratio: r_g -grain density: C -wheel speed (grinding): V

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-workpiece speed (grinding): V_w -wheel diameter (grinding): D -viscosity: -compensate dimension: D_c -part dimension: D_p -linear shrinkage factor: s -axial stress (pressurized thin wall cylinder): -hoop stress (pressurized thin wall cylinder): -air pressure (blow molding): P -stress (blow molding): -thickness (blow molding): t -# of moles removed by ECM: n -current (ECM): I -valence electron of anode (ECM): z -faraday's constant: F -volume of removed material (ECM): V -molecular mass of anode (ECM): M -mass density (ECM): d -electrode area (ECM): A -voltage (ECM): E -resistivity of electrode (ECM): r -inter-electrode gap (ECM): g -[anode] material constant (ECM): C -discharging energy (EDM): E -voltage (EDM): V -discharging current (EDM): I -on-time (EDM): T_on -melting temperature (EDM): T_m -unit constant (EDM): K -heat (welding): H -thermal energy/heat used for melting (welding): E_w -thermal energy source/heat source for welding: E_s -power (welding): P_w -power density (welding): PD -weld volume: V_w -amount of heat (welding): U_m -unit constant (welding): k -absolute melting temperature (welding): T_m -resistance (resistance welding): R Extra Notes +Surface Integrity: includes residual stress, cracks, plastic deformation, laps/folds/seams, voids/inclusions, hardness +Yield Strength: normally lower than tensile strength +Tool Types (hardest to softest): Diamond, CBN, Coated WC, WC, HSS +Metrology includes measurement of: dimension, form/shape, surface Units -SI Units: +Force: Newton (N) = [kg*m]/[s^2] +Pressure/Stress: Pascal (Pa) = [N]/[m^2] = [kg]/[m*s^2] +Energy/Work/Heat: Joule (J) = N*m= C*V = W*s = [kg*m^2]/[s^2] +Power: Watt (W) = [J]/[s] = V*A = [kg*m^2]/[s^3] -Voltage: Volt (V) = [W]/[A] = [J]/[C] = [kg*m^2]/[A*s^3] -Electric Charge: Coulomb (C) = s*A -Volumetric Flow: [m^3]/[s] -Angular Velocity: Omega ( ) = [rad]/[s] -Torque/Moment of Force: Newton Metre (N*m) = [m^2*kg]/[s^2] -Density/Mass Density: [kg]/[m^3] -Frequency: Hertz (Hz) = [1]/[s] +Strain: Doesnt have a unit
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