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# MEE 427 Test 1

TermDefinition
Normal Stress (sigma) equals what? P/A (force over cross sectional area)
engineering strain equals what? deflection over length
strength is proportional to what? strain
strength equation strength = E * strain
shear stress is proportional to what? strain angle
shear stress eqn tau = (modulus of rigidity (G))*shear angle
deflection eqn PL/AE
v is called what? poisson's ratio
v eqn -(transverse strain)/(longitudinal strain)
v is typically what for steels? 0.30
Eqn relating E to G and v E = 2G(1+v)
If given E and v, which values can be found? Strain, principal stresses
Principal stress eqn (sigma)1 = (E(strain1 + v*strain2))/(1-v^2) (sigma)2 = (E(strain2 + v*strain1))/(1-v^2)
Bending stress eqn sigma = (Mc)/I
c is distance from what? neutral axis
I for round xc eqn I = (pi*d^4)/64
bending stress for circular xc eqn 32M/(pi*d^3)
how do you find the moment of inertia for a hollow beam? Same equation, but subtract the inside diameter eqn from the outside diameter eqn
k = ? di/do
converting torque to lb*in 63000*HP/(RPM)
converting torque to lb*ft 5252*HP/(RPM)
converting torque to N*m 9549*kW/(RPM)
shear stress eqn tau = T*rho/(J) = (16T)/(pi*d^3)
Created by: flyerbud