The University of Queensland
School of Mechanical & Mining Engineering
MECH2100 - Machine Element Design
Questions and Answers for Tutorial Three 2014
Q1. A semi-circular groove of radius 3 mm is machined in a 50 mm diameter shaft which is
subject to a co
Tutorial 5 with worked Solutions
Q1.
Two steel plates with Sy = 440 MPa are butt welded together with a welding rod of Sy =
310 MPa. The thickness of the plates are both 20 mm and the weld length is 120 mm.
Determine the maximum tensile load (in kN) that
The University of Queensland
School of Mechanical & Mining Engineering
MECH2100 - Machine Element Design
Questions and Answers for Tutorial Four 2014
Q1. A drive shaft with a diameter of 300 mm is of fine-ground steel with an ultimate tensile
strength of
Solution MECH2100 Quiz 6 2014
1.
Peak shear in the weld due to bending is x = PL (d/2)/(2td3/12) = 3PL/(td2)
Direct shear in weld due to P = y = P/(2dt)
Resultant shear = vector sum = (P/td)(9L2/d2+ )1/2
Maximum shear stress = 0.58*345/2.5 = 80.04 MPa
Hen
Solution tutorial 8 gears
1.
2.
3.
4.
Pitch diameter
mm (US units uses pitch not module)
The angle between the normal force and the tangential force this is always 900
The average number of teeth in contact
5. Centre distance if mounted correctly is (20 +
The University of Queensland
School of Mechanical & Mining Engineering
MECH2100 - Machine Element Design
Questions and Answers for Tutorial One 2014
Q1:
There are four assessment items in this course. The computer-based assessment is worth
[15]%. Project
The University of Queensland
School of Mechanical & Mining Engineering
MECH2100 - Machine Element Design
Questions and Answers for Tutorial Two 2014
Q1.
The stepped shaft below with diameter D = 60mm and d = 40mm is loaded by a torque T
= 550 N.m. If the
Solution: tutorial 7, bolts and bearings
1. L/(d) =2/(30) = 0.02122 This is less than the coefficient of friction of 0.03.
Hence the thread will lock.
2. As in the previous quiz, the maximum bolt load is N = FL/(14a). Half of this causes
alternating stres