design
BDA 30803 – Semester II Session 2013/2014
DEPARTMENT OF MATERIAL AND ENGINEERING DESIGN
FACULTY OF MECHANICAL AND MANUFACTURING ENGINEERING
UNIVERSITI TUN HUSSEIN ONN MALAYSIA (UTHM), JOHOR
______________________________________________________________________
MECHANICAL ENGINEERING DESIGN (MED)
2nd ASSIGNMENT
Fatigue Failure Resulting from Variable Loading
S1.
A schematic of a clutch-testing machine is shown. The steel shaft rotates at a constant speed . An axial load, 1.xxx P is applied to the shaft and is cycled from zero to
1.xxx P. Change the xxx term in the axial load with your last three digits from your matric card number. The torque T induced by the clutch face onto the shaft is given by
T
f (1.xxxP)( D d )
4
Where D and d are defined in the figure and f is the coefficient of friction of the clutch face. The shaft is machined with Sy = 500 MPa and Sut = 700 MPa. The theoretical stress-concentration factors for the fillet are 3.0 and 1.8 for the axial and torsional loading, respectively.
Assume the load variation P is synchronous with shaft rotation. With f = 0.3, find the maximum allowable load P such that the shaft will survive a minimum of 106 cycles with a factor of safety of 3. Use the modified Goodman criterion. Determined the corresponding factor of safety guarding against yielding.
1.xxx P
BDA 30803 – Semester II Session 2013/2014
KEY IN ALL YOUR ANSWERS IN THE BOX AT THE EXCEL FILE GIVEN AND SAVE
THE EXCEL FILE IN 2003 VERSION FORMAT WITH THE NAME OF YOUR MATRIC
CARD NUMBER (e.g. – AD000001.xls). THEN SENT THE SOFTCOPY OF THE FILE TO
BELOW EMAIL ADDRESS ACCORDING TO YOUR CLASS SECTION azwir.uthm@gmail.com – for Section 2 sia@uthm.edu.my – for Section 1 ctkoh@uthm.edu.my – for Section 4 & 5 izaazura@uthm.edu.my – for Section 3
DEPARTMENT OF MATERIAL AND ENGINEERING DESIGN
FACULTY OF MECHANICAL AND MANUFACTURING ENGINEERING
UNIVERSITI TUN HUSSEIN ONN MALAYSIA (UTHM), JOHOR
______________________________________________________________________
MECHANICAL ENGINEERING DESIGN (MED)
2nd ASSIGNMENT
Fatigue Failure Resulting from Variable Loading
S1.
A schematic of a clutch-testing machine is shown. The steel shaft rotates at a constant speed . An axial load, 1.xxx P is applied to the shaft and is cycled from zero to
1.xxx P. Change the xxx term in the axial load with your last three digits from your matric card number. The torque T induced by the clutch face onto the shaft is given by
T
f (1.xxxP)( D d )
4
Where D and d are defined in the figure and f is the coefficient of friction of the clutch face. The shaft is machined with Sy = 500 MPa and Sut = 700 MPa. The theoretical stress-concentration factors for the fillet are 3.0 and 1.8 for the axial and torsional loading, respectively.
Assume the load variation P is synchronous with shaft rotation. With f = 0.3, find the maximum allowable load P such that the shaft will survive a minimum of 106 cycles with a factor of safety of 3. Use the modified Goodman criterion. Determined the corresponding factor of safety guarding against yielding.
1.xxx P
BDA 30803 – Semester II Session 2013/2014
KEY IN ALL YOUR ANSWERS IN THE BOX AT THE EXCEL FILE GIVEN AND SAVE
THE EXCEL FILE IN 2003 VERSION FORMAT WITH THE NAME OF YOUR MATRIC
CARD NUMBER (e.g. – AD000001.xls). THEN SENT THE SOFTCOPY OF THE FILE TO
BELOW EMAIL ADDRESS ACCORDING TO YOUR CLASS SECTION azwir.uthm@gmail.com – for Section 2 sia@uthm.edu.my – for Section 1 ctkoh@uthm.edu.my – for Section 4 & 5 izaazura@uthm.edu.my – for Section 3