Exam. 1C 
Machine Elements Design 
E1c 
Student Name: 
Student No. 
1 Show the following using stressstrain curve “A”: A Fracture point B Material yield point 



B) Define the following:
a Material ultimate strength:
b Stress:
c Second moment of area (I) :
2 A) Find the (_{}) of the following area (all dimensions in cm):
The circle diameter is 10 cm, and the square side length is 2 cm.

B Find (I_{x}) of the following shape (all dimensions in cm):
All the thicknesses is 2 cm.

3 A steel bar of an area of 20 mm^{2} is subjected to a tensile load of 1000 N at the top, and 1000 N, at the middle.
A) Chose suitable steel if the
required SF is 3.

B) Find the strain due to the tensile forces, if the modulus of elasticity of the shaft material E= 20x10^{4} MPa.
4 Find the bending stress (σ_{b}) on the shaft at (A) and (B):
The solid shaft diameter is
30 mm.
