236_Mechanics SolutionInstructors_Sol.Manual-Mechanics_Materials_7e.book_Gere_light.1

236_Mechanics SolutionInstructors_Sol.Manual-Mechanics_Materials_7e.book_Gere_light.1

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: Sec_2.8-2.12.qxd 230 9/25/08 11:44 AM Page 230 CHAPTER 2 Axially Loaded Members P2 s max A1 K s nom A1 a st A1 K (b) DIAMETER OF PRISMATIC BAR FOR THE SAME ALLOWABLE LOAD 80 MPa p b a b (20 mm)2 1.75 4 L 14.4 kN P2 st a 1K P1 ; d1 d0 pd2 0 b 4 st pd2 1 a b K4 20 mm L 15.1 mm 11.75 L d2 1 K d2 0 ; Enlarging the bar makes it weaker, not stronger. The ratio of loads is P1/P2 K 1.75 Problem 2.10-7 A stepped bar with a hole (see figure) has widths b 2.4 in. and c 1.6 in. The fillets have radii equal to 0.2 in. What is the diameter dmax of the largest hole that can be drilled through the bar without reducing the load-carrying capacity? Solution 2.10-7 Stepped bar with a hole b 2.4 in. BASED UPON HOLE (Use Fig. 2-63) c 1.6 in. b c1 Fillet radius: R 0.2 in. 2.4 in. bd Pmax Find dmax d s nom c1t BASED UPON FILLETS (Use Fig. 2-64) b 2.4 in. R/c Pmax c 0.125 s nomct 1.6 in. b/c 1.5 smax ct K L 0.317 bt smax R 0.2 in. K 2.10 smax c a b (bt) K b d(in.) 0.3 0.4 0.5 0.6 0.7 diameter of the hole (in.) smax (b d)t K d 1 a1 b btsmax K b d/b K 0.125 0.167 0.208 0.250 0.292 2.66 2.57 2.49 2.41 2.37 Pmax/bt 0.329 0.324 0.318 0.311 0.299 max ...
View Full Document

Ask a homework question - tutors are online