MAE 311 Machines and Mechanism I Home Works & Solutions Spring 2003 
Homework Policy:
Students may work on homework individually or in small groups no larger than three people total. A single assignment may be turned in for groups, with each person’s name clearly written on the upper right hand corner. Homework MUST BE turned in during class on the date due or the student will receive no credit.
Note: Book answer to problems are not always correct. Feel free to email TAs if u have any doubt on the Hw.
No. 
Questions 
Due Date 
Solutions 
HW#9 
1330, 142, 144, 1415*, 1417**
*use steel with Sut=135 kpsi and HB=300 (not allowable stress) given. Use a
safety factor of 2. 
28 April Monday 

HW #8 
112, 116, 121, 127,1212*, and 1217. *Requires iteration. Also check this final design against the design criteria discussed in class. see notes. 
18 April 2003 Friday 

HW #7 
91, 910*, 103, 107, 1014, 1016** * For 910, no direct shear. ** For 1016, load varies between 0 to 60 N 
31 March 2003 

HW #6 
811*, 821**, 824, 830, 837***, 839 * For 811, use kb/(kb+km) = C = 0.213 ** For 821, use C = 0.213, use Goodman relation instead of Gerber relation. *** For 837, assume bracket pivots about lower edge. 
24 March 2003 

HW #5 
720, 723, 724, 726, 729 
3 March 2003 

HW #4 
#1. 71 
17 Feb 2003 

HW #3 
Probs 61*, 66, 616** and Extra Q. Extra Q: Show that "Shear Strength Ssy of a material is 0.5Sy for MSST and 0.577Sy for Distortion Energy.
Note: *Max shear stress & Distortion Energy Only. **The max bending moment is 23.1 Nm.
Hint: For Question 616, first find the location where maximum shear and moment occur using shear and moment diagram. Then find the location (cross section) where maximum stress occur (two location). 
10 Feb 2003 Monday 

HW #2 
Probs 242, 243, 248, 249, 267**No octahedral.
Note: For Question 242 & 243, you need to first determine it is a "Thin wall" or a "Thick wall" Structure, then use the corresponding Equation. 
31 Jan 2003 Friday 

HW #1 
Probs. 2.1*, 2.5**, 2.9, 2.26a, 2.29 
24 Jan 2003 (Friday) 




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