1) Find the critical stresses for the loading shown at section a-a if the load P applied is 100 N. The pliers is made of 4140 steel with a yield strength Sy of 417 MPa and Su of 655 MPa. Determine:
a. The maximum principle stresses.
b. The maximum shear stress.
c. The factor of safety using the maximum normal stress theory.
d. The factor of safety using the maximum shear stress theory.
e. The factor of safety using the maximum distortion energy theory.
2. Draw the free body diagram for the pinned assembly shown. Determine:
(a) The reaction forces at A and D.
(b) The magnitude of the force acting on member AB.
(c) The minimum cross sectional area of link AB to prevent failure if it is made of 1020 hot-rolled steel (Sy = 290 MPa, Su = 475 MPa).
