For the various parts shown in Figure P7-39 on the next page determine the best one to relieve stress. Make the original part have a small radius of 0.1 in. at the inside reentrant corners. Place a uniform pressure load of 1000 psi on the right end of each part and fix the left end. All units shown are taken in inches. Let the material be A36 steel.

Figure P7-39

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1.0 1.0 3.0 1.0 3.0 3.0 (a) Original design T R=1.0 1.0 1.0 1.0 1'0 3.0 1.0 3.0 3.0 3.0 3.0 (c) Radius 3.0 (b) Taper 3.0 3.0 -3/8 in. rad. 1.0 3/8 3/16 R= in R=0.1 in. rad. 3.0 1.0 3.0 1.0 in. rad. 7/8 3/8 1.0 3.0 3.0 O 16 in. rad. (d) Undercut 서 -3/8 (e) Relief Holes