Sample Exam 1

Machine Elements Design

SE1

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 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