Design of Turnbuckle

SR. PARAMETER- TURN BUCKLE EQUATIONS -KHURMI NOTE 1 Material PSG-

1.9 Plain corbon steel of Grade C20( σyt= 260 N/mm2)

2 Factor of safety fs 3

3 Permissible stresses [MSST] [σt] =

), , [σbr]= 0.6 [σt], [σcr]= 1.6 [σt],

4

dc bolt, dc nut

dc

dO

Nominal dia of the thread( d ) corresponds to core dia. dc or STRESS AREA

PSG -5.42

5

l

dc of bolt dc of nut

n= no. of threads = l/p , p= pitch Take max.

6 Check for safety

7 D

8

D2

9 Inside diameter of coupler

body D1 D1= do+ (2 x 5) mm

10 Length , t l. t l = 6d, t = 0.75d Std.prop.