tailieunhanh - Engineering Mechanics Statics - Examples Part 13

Tham khảo tài liệu 'engineering mechanics statics - examples part 13', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Engineering Mechanics - Statics Chapter 8 Pcb Fe 2 2 ---------------- 7 b c cos p b sin p a The equilibrium of clamped block requires that Fd Fe Fe N Fd N Problem 8-82 The clamp provides pressure from several directions on the edges of the board. If the square-threaded screw has a lead h radius r and the coefficient of static friction is as determine the horizontal force developed on the board at A and the vertical forces developed at B and C if a torque M is applied to the handle to tighten it further. The blocks at B and C are pin-connected to the board. Given h 3 mm r 10 mm As M N- m p 45 deg Solution h atan as . h A e atan ỵ 2 nrJ M Axr tan 0s e s Fx 0 Ax - 2Tcos p 0 Cy T sin p ệs deg e deg Ax M r tan 0s e Ax 329 N . A x 1 A T 2 Icos p J T N By Cy B B Cy 7 N 842 2007 R. C. Hibbeler. Published by Pearson Education Inc. Upper Saddle River NJ. All rights reserved. This material is protected under all copyright laws as they currently exist. No portion of this material may be reproduced in any form or by any means without permission in writing from the publisher. Engineering Mechanics - Statics Chapter 8 Problem 8-83 The two blocks under the double wedge are brought together using a left and right square-threaded screw. If the mean diameter is d the lead is rb and the coefficient of static friction is Fs determine the torque needed to draw the blocks together. The coefficient of static friction between each block and its surfaces of contact is Fs. Units Used kN 103 N Given F 5 kN ớ 20 deg d 20 mm ri 5 mm Fs F s Solution Top block -F 2N1 cos ớ - 2ạ sNì sin ớ 0 F Nì ì----T-T 7 2 cos ớ - ụ s sin ớ Nj Bottom block N - Nị cos ớ ựsNi sin ớ 0 N N1 cos ớ - u s N sin ớ N kN -N sin ớ - ựsNi cos ớ T- F sN 0 T N1 sin ớ u s N cos ớ F s N T kN 843 2007 R. C. Hibbeler. Published by Pearson Education Inc. Upper Saddle River NJ. All rights reserved. This material is protected under all copyright laws as .

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