Flashcards
Materials Equations
Cards in this deck (27)
- 1Hall- Petch equationYield stress = Internal stress+ k d-1/2
k - constant
d- grain size - 2Heating/CoolingQ=mC∆T
- 3Solidification/MeltingQ=ml
- 4Temperature rise due to workingU~ro*C*∆T
- 5True stress strain relationshipStrain = K strain^strain index
- 6Extrusion U(total)=?U(total)= U(ideal) + U(friction) + U(redundant)
- 7EfficiencyU(ideal)/U(total)
- 8Ideal work per unit volumeArea under stress-strain curve
- 9Ideal work pre unit volume for hot-workingYield flow stress *∆ strain
- 10Ideal work per unit volume for cold- workingYield flow stress*Ln(l1/l0) or Ln(A0/A1) or Ln(h0/h1)
- 11Strain rate dependance of yield stressY=C strain^m
- 12Average forming pressure to deform the workpieceP= Y((1+muA)/h)
- 13Forging force requiredPressure x area,
Area = 2a*w
where w is workpiece depth - 14Pressure required for extrusionP= F/A0 = Y*Ln(A0/A1)
- 15Wire drawingY*Ln(A0/A1) = Y
- 16Sheet metal formability, rstrain w/strain transverse
Ln(wfinal/winitial)/Ln(tfinal/tinitial) - 17Average rr.ave = rl * 2r45* rw/4
- 18∆r∆r= rl+rt-2r45/4
- 19Thermal conductionq/A= k/x(T1-T0)
- 20Thermal Convectionq/A= -u(T1-T0)
- 21Combination of thermal resistancesq/a=-U(t)*(T4-T0)
- 22Thermal diffusivity, Alphaalpha = k/ro*c
units- m^2s^-1 - 23Latent heat production during casting solidificationq/A=-ro*H*dx/dt
- 24Approx condition for sand castingq/a(x=0) = -km(dt(x,t)/dx)(x=0)
- 25Total solidification timesoldification time proportional to (V/A)^2
- 26Gravity die casting and continuous die castingq/A = -u(Tmelt-T0) = -ro(c) *H*dx/dt
hence
s = [u(Tmelt - T0)/ro(c)*H ]*ts - 27Rate of material removing - single point lathe turningspeed x feed x depth of cut
distance moved in one revolution is feed thickness
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- Bachelors Degree Materials Flashcards on Materials Equations, created by Nick Gray on 17/01/2016.
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- Nick Gray
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