재료역학 6판 6th James M. Gere 교보문고 솔루션 입니다. 732페이지 입니다..
Tension, Compression, and Shear
Normal Stress and Strain
Problem 1.2-1 A solid circular post ABC (see figure) supports a load P1 2500 lb acting at the top. A second load P2 is uniformly distributed around the shelf at B. The diameters of the upper and lower parts of the post are dAB 1.25 in. and dBC 2.25 in., respectively. (a) Calculate the normal stress AB in the upper part of the post. (b) If it is desired that the lower part of the post have the same compressive stress as the upper part, what should be the magnitude of the load P2?
dAB P2 B dBC
Solution 1.2-1 P1 2500 lb dAB dBC 1.25 in. 2.25 in.
Circular post in compression ALTERNATE SOLUTION sBC sAB 2040 psi ?…(생략)
P1 P2 P1 P2 2 ABC 4 dBC P1 P1 sBC 2 AAB 4 dAB P1 2 or P2 dAB
(a) NORMAL STRESS IN PART AB sAB P1 AAB 2500 lb 2 4 (1.25 in.)