{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

hw12sol.Spring07

hw12sol.Spring07 - ME 452 Machine Design II Solution to...

Info icon This preview shows pages 1–4. Sign up to view the full content.

View Full Document Right Arrow Icon
1 ME 452: Machine Design II Solution to Homework Set 12 Problem 1. (Problem 8-22, page 448). To determine the member stiffness use the approach outlined by Eq. (8-20), see page 415. Compare your result with the answer obtained from the finite-element study, see Eq. (8-23). To determine the length of the bolt use Table A-17, page 1015. To determine the height of the hexagonal nut use Table A-31, page 1035. Determine the preload using Eqs. (8-30) and (8-31), see page 427. Determine the load factor guarding against over-proof loading using Eq. (8-28), see page 425. Also determine the load factor guarding against joint separation using Eq. (8-29), see page 426. Solution: The stiffness of the bolt, see Equation (8-17), page 413 can be written as d t b d t t d A A E k A l Al = + The area of the unthreaded portion of the bolts, see Table (8-7), page 412, can be written as 2 4 d d A π = Therefore, the area of the unthreaded portion of the bolts is given as 2 2 (12) 113 mm 4 d A π × = = The tensile stress area for metric threads, see Table (8-1), page 398, for a diameter of 12 mm and assuming coarse pitch , is given as 2 84.3 mm t A = The length of the grip, see Figure for Problem (8-20), page 453, is given as 20 25 45 mm G L = + = The height of the hexagonal head of the bolt, see Table (A-31), page 1035 , for a 12 mm size bolt and assuming regular hexagonal nut, is given as 10.8 mm H =
Image of page 1

Info icon This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon