Normal Stress

 

 

Example:  Link  AC has a uniform cross section ¼ in wide and 1/16 in thick.  A smooth pin

connects the link to the rectangular plate at A.  Smooth pins also are at C and B.  A cord raps

around the smooth pulleys as shown.  The tension in the cord, P, is 300 lb.  Find the normal

stress midway along the link AC.

 

 

                                     

 

 

Strategy:  Construct a free body diagrams of the plate and of link, AC.  Use equilibrium to

find the force in the link.  Then the normal stress in the link is just the force it carries divided

by the cross-sectional area of the link.

 

 

                         

 

 

The equations of equilibrium are:  ΣFx = 0, ΣFy = 0, and ΣMB = 0.

 

Click here to continue with this example.

 

                                           

 

 

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