Problem 4-102/4-103/4-104/ Engineering Mechanics Materials.

Engineering Mechanics problem with solution
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4–102. The rigid lever arm is supported by two A-36 steel wires having the same diameter of 4 mm. Determine the smallest force P that will cause (a) only one of the wires to yield; (b) both wires to yield. Consider A-36 steel as an elastic-perfectly plastic material.

4–103. Two steel wires, each having a cross-sectional area of 2 mm 2 are tied to a ring at C , and then stretched and tied between the two pins A and B .The initial tension in the wires is 50 N. If a horizontal force P is applied to the ring, determine the force in each wire if P = 20 N. What is
the smallest force P that must be applied to the ring to reduce the force in wire CB to zero? Take sY = 300 MPa. Est = 200 GPa.

4–104. The rigid beam is supported by three 25-mm diameter A-36 steel rods. If the beam supports the force of P = 230 kN , determine the force developed in each rod. Consider the steel to be an elastic perfectly-plastic material.