tailieunhanh - Bruhn - Analysis And Design Of Flight Vehicles Structures Episode 3 part 12

Tham khảo tài liệu 'bruhn - analysis and design of flight vehicles structures episode 3 part 12', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | DI. 14 FITTING s AND CONN ECTIONS. BOLTED AND RIVETED. and Mo -200 X - 1000 X .25 -SCO . Since py and Ph act through. the bolt centroid they will be reacted equally by each bolt hence 7 lead on each belt due to Py -200 4 -50 lb. H load on each bolt due to Ph 1000 4 250 lb. The load produced on each bolt due to the moment load Mo -SCO . will vary directly as the distance of the bolt from the center of resistance which coincides with the bolt group centroid. Let ra equal the distance from the bolt group centroid to bolt a . Then the resisting moment developed by bolt a equals Fara where Fa equals the load on bolt a since the bolt loads are proportional to their distance from 0 the resisting moment Mi-J developed by bolt b will equal pr- r or Fa -y and similarly for bolt c ra ra a _ . a _ rc . rd Mc Fa -hd -or bolt d - Fa . ra a The total moment resistance of the bolt group therefore equals ra hence where I 2 ra of bolt group. Therefore for the loads on the other bolts Mr Mr Mr For the bolt group of Fig. ra rh rc trj 7 Hence I X Sr3 4 X m. Therefore the moment load Fm on each bolt will equal Fm 22 yis5. 120 lb. Fig. shows the resulting H V and moment loads applied to each bolt. The resultant load can be found graphically by drawing the force polygons as shown In Fig. . The resultant bolt loads can likewise be determined analytically. For example consider bolt c ZH 250 120 X T- 0 34Ổ lb. zv -50 _ 120 X -i2uL 4- 0 -122 lb. Hence R ựSH3 SV3 - ỳÍ34Ổ3 122 367 lb. Case Where Bolts or Rivets are of Different Diameters. When the joint bolts or rivets are not all the same size the moment load on each bolt is proportional to the bolt area times Its distance to the bolt group centroid. Thus the bolt areas must enter equation 15 . hence MAp r Q f a n A r 1 2 m A r 3 n A r 3 n A r 3 aaa obb ccc ddd -------------------------------------------- 16 n number of bolts of each size. Since theory of loads on a multiple bolt group Is .

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