Esfuerzo simple

Teacher 2

Mechanics of Materials

1. The figure shows the union of a truss and the base of a wooden armor. Slighting the friction:
a) Determine the dimension b if the acceptable shear stress is900 KPa.
b) Calculate the dimension c if the bearing stress should not exceed 7MPa.
R: 0.32m, 0.041m

2. Two pieces of wood, with a thickness of 7/8in and 6in wide each of them, are pasted withglue as shown in
the figure. Knowing that the union will fail when the shear stress in the glue reaches 120psi. Find the
minimum permissible length (d) on the cuttings if the joint should support anaxial load of P=1200Lb.
R: 1.632in

FIME-UANL

1

Teacher 2

Mechanics of Materials

3. The shackle of the anchor cable supports the force of 600Lb. If the pin has a diameter of 0.25in.Determine
the shear stress at the pin.
R: 6111.549psi

4. Three steel plates, with 5/8in of thickness each, are joined by two rivets of ½in each:
a) If the load is P=10kips, which is the maximumbearing stress acting on the rivets?
b) If the maximum shear stress that the rivets can support is 32ksi, what is the force P required to fail by
shear?
R: 16ksi, 25.132kips

FIME-UANL

2Teacher 2

Mechanics of Materials

5. The top wire of a circus is fixed to a vertical column AC and remains tense with a tensor wire BD. The
column AC is locked in C with a bolt of 10mm in diameterto the bracket shown in the detail a - a.
Calculate the average shear stress in the screw on C if the tension in the top wire is 5KN (horizontal).
R: 28.352MPa

6. In the figure, is shown theunion of a vertical column and a diagonal backup. The connection is composed
of three bolts of 5/8in that unite the two plates of 1/4in (base plate and connection plate), the load P
maintained by thebackup is of 5.5KN, determine:
a) The shear stress in the bolts.
b) The bearing stress between the plates and the bolts.
R: 5975.737psi, 11733.333psi

FIME-UANL

3

Teacher 2

Mechanics of...