Question

    

The attachment shown carries a static bending load of 12 kN. The length of attachment, l₁ = 225 mm. The other dimensions are as shown on figure Q-2 below. Allowable shear stress on weldment is t_all = 120 MPa. Both column and attachment are made of AISI 1030 HR steel. A minimum factor of safety for the joint n = 1.5 is required. Among several possible weld patterns, we are asked to decide on one of the two patterns (i) and (ii) as described below.

1. Determine whether the materials are going to satisfy the required safety condition. [10 pts.]
2. Choose the pattern that you consider more approprate, and explain your decision by showing why it is better for the task.                                                                             [20 pts.]
3. Determe the safr weld size h (rounding it to the nearest mm).                                   [10 pts.]

150 A D А D А 37.5 dia. -75 dia. 12 X z 1030 HR с B 1030 HR C B B 100 F = 12 kN (i) (ii) Proposed Patterns for weldment. Problem Q-2 (Dimensions in mm.)

  

Answer 1

Patters (i) is selected From table 9.1 can (4 A2 0.7016 (ab+d) Here b= 75mm d = 75 mm A z 2 o 2020 h (227577 75) 159.08h Primary Shear Zy x18 Vz 12KN 23 12x10² 159.08b = 75.43 b Secondary shear 863+6bda ta' Ju . 64 26td 12 3 8x734 6x75x75+75 754 12 2x75+75 527343.75 - 140605 = 386.718. x103 mm?

(45) 520.707(b)x5u o 70 7xbx 386.718 X10 x103 273.41 xlos b may My cos45 Zxh 2 mry J 다. 12กษ 75. ? ba 25 mm 75 3 - 2:2 1 abed 2x 75 ý od/2. As 37.5 mm laxlox (245-32-5) -- 2 12x10²x 187.5 ry 37.5 2 12x109x187.5*37.5 273-41x10²xb 308.6 ll Zy Zman (22)2 +(24+2;)? h (308-6 )2+(15:43+308-6) 2 aman h x 492.66 th

Unit Second Polar Moment of Area Weld Throat Area Location of G 4. A = 0.707h(25 d) |--6-1 T 869 + 6bd? + 12 = 2b + y =d/2 2b + c C