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Tham khảo tài liệu 'mechanics of materials 3rd ed part 3', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | PROBLEM 2.128 45 in.- c Area 1.2 in2 in. 2.128 The uniform rods AB and BC are made of steel and are loaded as shown. Knowing that E 29 X 106 psi determine the magnitude and direction of the deflection of point B when 6 22 . SOLUTION Bt Vcosồ ZS x Kos 73.I3 O3 Jk X PscLtoC r G xto Xo.Si i B 0.044 g 0 00 m - ps.A e 2 x ò 3 s 22 - . Séíx t A Pm U r nnt-T . . AB E A 2 ĩlr OfcXl. ì -OOS13 O- 0Q 73 ỹ 3-5 GL cmc Ỡ.ứớé73 0.O45S in PROBLEM 2.129 45 in. 25 in. Area 1.2 in2 I 417.04 s 1 Í Ao 0 ÕỨ 2.129 Knowing that E 29 x IO6 psi determine a the value of óMor which the deflection of point B is down and to the left along a line forming an angle of 36 with the horizontal b the corresponding magnitude of the deflection of B. SOLUTION Be s CoS 36 A 6C Sbg _ 75 X 10 s 0 8 cos 36 t 8c. Hs 417-03 s s s n 3é FAacSacs yĩxuo ù.ĩOS s n36 At La AB 3 3. zo Ỗ A - 31 .70 s I.7CI7 ơ 4 7 04 to3 Ỗ - J H 17-04 o3 m. 7.0 r o s s ô G3.0 0 0277 Be 4 .3 3x ô ị u PROBLEM 2.130 2.130 The uniform wire ABC of unstretched length 21 is attached to the supports shown and a vertical load p is applied at the midpoint B. Denoting by A the cross-sectional area of the wire and by E the modulus of elasticity show that for â I the deflection at the midpoint B is SOLUTION Use roxiVhạỉtÍcm ô ỡ tí Pj. 25 s 4 ios 2 Fy o Pab - CIO FW P L AfS Fro kVi V l gliT tv iftvia. e. uu sABr r s1 D 5 SAg I pji ABS P 3 . Sa 0 s y AẼ n 2.131 The steel bars5 and AD each have a 6xl8-mm cross section. Knowing that E 200 GPa determine the deflections of points J B and c of the rigid bar ABC. PROBLEM 2.131 3.2 kN 300 mm 75 mm 400 mm 400 mm SOLUTION ùse id bar B A8c CL V -e . ìooơí OS ipAo C3ửo 3-ZV Ơ Pad 12.s kw 3.2 kN Ad IG kN X 3tx V eV eựRỡtAS e 75T e _ pAbLạo _ 2.3x o3 Y oox O 5 Ab EA ồồ o ỵ ogx o 337.09 x õ ctv. - 0.237 _ c Lgf _ . IỔ X lo y Ồ0 t Io BF 2.9ố.3 Ion 0 296 hiiM- Sa Sa 37 0 . 4- 2 6.30 Zlo Lab 7S lo 3 7JII2 ỈO n Sb Lftc . So X o c 8ữơ X o-3 7.1H z XI o 3 Ì 9 2 7 x o V 2. 3 -
