Automotive Design	Sample Exam. 2	(1427-1428, 2nd Semester)
Student Name: ……………………………………………		Student No.      -      -

ASSUME ANY MISSING DATA

1- A) Write down parts of car suspension and their functions:

أذكر أجزاء نظام التعليق بالسيارة ووظيفة/عمل كل جزء:

Part name	Functions

B) What is the difference between the k_s, k_w factors of spring:

 

 

C) Two springs have the same stiffness are connected in series. What will be the stiffness of each spring? If the total deflection of the two springs was 100 mm when they carried a mass of 40 kg.

D) Find the shear stress in the spring due to the force of 4000 N. If the spring has a mean diameter of 150 mm and the diameter of the spring wire is 15 mm.

i- due to torsion only (tt = T r / J) ii- due to direct shear only (ts = P / A) iii- due to torsion, taking into consideration both direct shear and wire curvature, where

 

2) If a single plate friction clutch has to match with an engine which has a maximum torque of 180 Nm. Find the stresses in the following parts:

A) Bearing pressure of the frictional material, if r_o = 120 mm, r_i = 180 mm, m= 0.4

 

 

 

B) the shear stress in the splines, if D = 20 mm, d = 18 mm, L = 25 mm, n splines = 24 splines, b = 1 mm

C) the tension in the bolts, if n _bolts = 6 bolts, A _bolt =  50  mm²

 

 

 

 

D) the shear in the plat rivets, if r _rivets = 150 mm, A _rivet = 10  mm², n _rivets = 16 rivets

 

 

 

 

E) the tension in the metal strip, z units = 3, n strip = 2 , t = 0.5 mm,  B = 16 mm, d rivets = 6 mm, L = 60 mm, S = 5 mm

 

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