Question

Required information The part shown is loaded at point B with 300 lbf in the negative y direction, at point C with 220 lbf in the negative z direction, and at point D with a force with components of 60 lbf in the positive x direction and 79 lbf in the positive y direction. The diameter of the bar AB is 0.75 in. Evaluate the likelihood of failure in bar AB. 1 0.75-in dia 6 in 5.5 in 15 in where P= 220 lbf, Q = 300 lbf, R= 60 lbf, and S= 79 lbf NOTE: This is a multi-part question. Once an answer is submitted, you will be unable to return to this part. Determine the precise location of the critical stress element at the cross section at A. The precise location of the critical stress element will be at an D a ngle from the vertical y axis.

Answer 1

3oolbf22016f 0.75" 7316 5. 5t At PointA, Netforce in re-direction Fu= bolbt fy=79-300 = -221 lb) FZ = -220lbf My=-300X55679X5.5 = -1215.5 lbf-in My = 220x5.57 60x5= 1510lbt-in Tu=7985 = 395 lbf ein Let the maximum stress occurs at point E ano at angle o from y-axis. CE 16T4 = 16x395 - 4768.51 lbf/in2 Td 3 7x0.753- Normal force Ex generate normal stress (Joe=960 2 = 135.81 ebfline 2 X 0.752 - bending stress due to M2 DE I Ix0.754 - 29347.5 Como Hoflina bending stress due to my f - 1510X RSINO- 36458.03 Sinelloilin B uxo.gry- (b) = ML. 1215.5 XR Code

Now, Total stress acting at point E (T), 36458.03 gino +39347.5680 +135,81 or 36458.03 Cos O 29347.5.3ino 26-0, ) tomo - 36458.03 - 1.2422 29347.5 O=51.167° Ə O2 - -36458.03 sino - 29347.5 sino 0= 51.167 80%0=51-167 80, ranimum will occur at (v- 46938,23 Staf | in2 T0-5 ,167 80, critical location is at the end of the bar and at the point 51.167° from the yo axeis.