ME 314 Design of Machine Elements Assignment = 2
Last date for submission is 05-09-2014 All these problems are
examples in Bhandari book. However, those who reproduce the
solutions directly from the Bhandari book will not get marks for
these assignments. You must solve these problems using the factors
and approach told in the class. You must consider all necessary
data from data already given to you.
A problem on stress concentration zones in static loading Q1. A
plate 10 mm thick, subjected to a tensile load of 20 kN is shown in
figure. The plate is made of cast iron (Sut = 350 MPa) and the
factor of safety is 2.5. Determine the fillet radius. Ans: 2.85 or
3 mm
Completely reverse load and infinite problems
Q2. A plate made of steel 20C8 (Sut = 440 N/mm2) in hot rolled
and normalized condition is shown in Fig. It is subjected to a
completely reversed axial load of 30 kN. The notch sensitivity
factor q can be taken as 0.8 and the expected reliability is 90%.
The size factor is 2. The factor of safety is 2. Determine the
plate thickness for infinite life.
Q3. A component machined from a plate made of steel 45C8 (Sut =
630 N/mm2) is shown in Fig. It is subjected to a completely
reversed axial force of 50 kN. The expected reliability is 90% and
the factor of safety is 2. The size factor is 0.85. Determine the
plate thickness t for infinite life, if the notch sensitivity
factor is 0.8.
Completely reverse load finite life problems
Q4. A rotating shaft, subjected to a non rotating force of 5 kN
and simply supported between two bearings A and E is shown in Fig.
The shaft is machined from plain carbon steel 30C8 (Sut = 500
N/mm2) and the expected reliability is 90%. The equivalent notch
radius at the fillet section can be taken as 3 mm. What is the life
of the shaft?
LittlefingerCalloutDone!!
LittlefingerCalloutAnswer in book :- 29.47
LittlefingerCalloutAnswer in book :- 44.85
