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 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