Problem 1-69/1-70/1-71/ Engineering Mechanics Materials.

Engineering mechanics problem with solution.
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1–69. Member B is subjected to a compressive force of
800 lb. If A and B are both made of wood and are 3
/8 in. thick,
determine to the nearest 1
/4 in. the smallest dimension h of
the horizontal segment so that it does not fail in shear. The average shear stress for the segment is tallow = 300 psi.

1–70. The lever is attached to the shaft A using a key that has a width d and length of 25 mm. If the shaft is fixed and a vertical force of 200 N is applied perpendicular to the handle, determine the dimension d if the allowable shear stress for the key is
tallow = 35 MPa.

1–71. The joint is fastened together using two bolts. Determine the required diameter of the bolts if the failure shear stress for the bolts is tfail = 350 MPa. Use a factor of
safety for shear of F.S. = 2.5.