Question

Link BD is 5.6 mm thick and is made of a steel with a 566 MPa ultimate strength in tension. What should be its width, w, in mm if the structure shown is being designed to support a 17.9 kN load with a factor of safety of 3.1? LAB=189 mm and LBC=149 mm. Note: Your answer should be given in the requested units and be to 1 decimal place. Suggestion: Work out the problem symbolically and then plug in the numbers. This will help with the next problem. D D Front view w t B B Side view LAB LBC A B Top view

Answer 1

imala priladwis BO wo? t=5.6mm C furt 5 66 MPa B fos:0 3.1 P K L-AL LAB hallow Gult 182.6 MPa fBD of ABC ry ad t in de ol By inspection! 4 LAB LBC cy stretched BO linkis tension Cazo reitis as x3 {fy -P + FBD + Cy FBD1 Bay P. - (FBOX LABC) + EM 20 @ # C O. 787 +84 70xd :) P (LAB+ LBC) aay force in LBL link Bo

P= 19.9 kn www 681 wwbnl LBC = (179) ( 189 +149) 40.6 kN. FBD : 149 11 FBD = 40.6 kN fros It day 6 EBD AGD Gallow- FBD FBD Gallow wat 21 w= FBD tx Callow FBD: 40.6 kN; t = 5.6mm 182.6 upa; Callow= we know, 40.6 X103 1182 .6 X106) (5.6 X10-3) * -3 XID 39.7 link BD. width of mm - 39.7 E