Exam. 1-B	Machine Elements Design	E1b
Student Name:		Student No.

1- A) Using stress-strain curve, show the following:  a- Material ultimate strength (σu )  b- Material elastic limit c- Material modulus of elasticity

B) Define the following:

a- Strain:

b- Allowable stress:

c- Safety factor:

2- A) Find the () of the following area (all dimensions in cm):

B- Find (I_x) of the following shape (all dimensions in cm):

All thicknesses are 1 cm.

3- A steel bar of an area of 100 mm² is subjected to a tensile load of 10 000 N,

A) Chose suitable steel if the required SF is 4.

B) Find extension on the shaft DL due to the tensile force, if the modulus of elasticity of the shaft material E= 20x10⁴ MPa.

4- Find maximum bending stress on the shaft:

The solid shaft small diameter is 20 mm, the shaft big diameter is 26 mm.