stress

what is statical determinancy?

all forces can be calculated from a knowledge of external, applied forces using equilibrium alone

what does the maximum load on a frame depend on?

shear failure of pin, tensile yield of bar, compressive yield of bar, buckling of bar

how are safety factors calculated?

max allowable stress/ max operational stress

what does a positive value for force/ stress represent?

tensile

what does a negative value for force/ stress represent?

compressive

hydrostatic stress definition

equal normal stress acts on it in every direction

bulk modulus (K) definition

the ratio of hydrostatic stress to volumetric strain

what is a beam intended to resist?

axial force

what is a bar intended to resist?

bending

what does equal torsional stiffness between shafts mean?

torque is shared evenly between shafts

thin wall assumptions: torsion

small angle of twist, axial symmetry, thin wall, no change in shape across angle

Likelihood of buckling formula

Force x length²