Sample Exam 1

Machine Elements Design

SE1

 

Student Name:

Student Number:

 

 

1- A) Using stress-strain curve, show the following:

 a- Material ultimate strength (σu )

 b- Material elastic limit

c- Material modulus of elasticity (E)

 

B) Define the following:

a- Strain (ε):

 

 

b- Allowable stress (σall):



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 (Ix) of the following shape (all dimensions in cm):All the thicknesses are 2 cm.

 

 

 

 

 

 

 

3- A steel bar of circular cross section, the bar diameter is 20 mm

(a) Find the tensile stress at point A, due to a force of 10 000 N.

 

 

 

 

(b) Find the bending stress at point A, due to a force of 1000 N.

 

 

 

 

c) Find the torsion stress at point A, due to a torque of 300 Nm.

 

 

 

 

 

 

(d) Find the strain in case (a), if the modulus of elasticity of the shaft material E= 20x104 MPa.

 

 

 

 

 

 

 

 (e) Find the stress at point A, due to combined loading as in case (a) and case (b).

 

 

 

 

 

 

 

4- Write down the types of springs and their usages in machines

 

Spring type

 

Spring usages