ichtened until th ownThe was constant of the joint is caos t

ichtened until th own.The was constant of the joint is caos. the bolt teaches 2000 and the stillness N B) the joint is 1o an external load of 3000Nas following is hown which of the The tension in the bolt wil be 2000 N tension in the bolt wil be 3500 N the bolt wil be d000 N The in the belt wil he soooN CU For the same joint described above. no eeternal load a pled 10th ieint me bat and the clamped material load are to an ialemal load of 5000 N as shown the joint is joint described above D) For the same which of the following is true? The tension in the bolt wil be 4500 N b) The tension in the bolt S000N c) The tension the bolt wil be 6000N in d) The tension the bolt wul be 7000 N in E) When calculating the factor of safety for the parent the vicinity of weldment we materialin a) should always use the cold-drawn yield strergth regardless of the ereisaltandzion of me material

Solution

A) Power screw is self locking when frictional forces on threads are greater that forces comming on threads. Answer B

B) As C=0.5, External load taken by bolt=C*3000=1.5*3000=1500 N.

Therefore, Total load on bolt=1500+2000 (preload)

=3500 N

Answer b

C) Answer c

Load on both bolt and joint menbers will be same and equal to the preloads.

D) Similarly the external load taken by bolt= C*5000=2500N

Tension in the bolt=Preload+2500=4500 N

Answer a.

E) Answer b , as hot rolled yield strength is always lesser and to be in safer design in weldment minimum strength is considered

F) Answer C.

In influence of fatigue loading the strength comes down ans uder such loading the iregularieties which are prone to crack initiations are to be avoided.

G) Answer d

Weld bead is shear in loading

H) Answer c

shear stress on the planes in the weld = P*(sin theta +cos theta)/leg length* weld length

therfore stress max at theta=45 degree