A ductile material has the properties Syu = 62 psi and Syc = 78 psi. Using the ductile Coulomb- Mohr theory, determine the factor of safety for the states of plane stress: a) σx = 20 ksi, σy = 15 ksi
b) σx = 15 ksi, σy = −20 ksi
c) σx = 20 ksi, τxy = −15 ksi
d) σx = −10 ksi, σy = 15 ksi, τxy = −10 ksi
e) σx= −24 ksi, σy = −20 ksi, τxy = −15 ksi