April 24, 2014
FE Analysis of Pressure Cooker ME 309a PROJECT
Group Members:
Abhinaw Kumar Singh : 2011183
Govinda Parasrampuria : 2011248
Jatin Gupta : 2011052
Supervisors:
Md. Zahid Ansari
Table of Contents
Abstract ...................................................................................... 1
Analysis ...................................................................................... 3
Objective ................................................................................... 9
Material Selection ................................................................... 10
Boundary Conditions .............................................................. 11
CAD Model ............................................................................... 12
Design #1 ................................................................................ 12
Design #2 ................................................................................ 13
Design #3 ............................................................................... 14
Results ...................................................................................... 15
Conclusion .............................................................................. 16
PAGE 1
Abstract
In this project we have tried to analyze the stresses produced in a
pressure cooker when subjected to above normal working
conditions. After looking at a wide variety of possible shapes, sizes
and materials, we arrived at a conclusion of choosing three designs
and three materials, all subjected to various loads and analyzing
them using FEM.
We made use of commercial softwares like ANSYS, CATIA and Pro-
Engineer to analyze the problem.
We have looked at all the results of the analysis and have
developed the detailed report for the same.
PAGE 2
Introduction
A common sight in every household is the pressure cooker.
Pressure cooking is the process of cooking food, using
water or other cooking liquid, in a sealed vessel.
Pressure cookers heat food quickly because the internal
steam pressure from the boiling liquid causes saturated
steam (or "wet steam") to bombard and permeate the food.
Thus, higher temperature water vapor (i.e., increased
energy), which transfers heat more rapidly compared to dry
air, cooks food very quickly.
Pressure is created initially by boiling a liquid such as water
or broth inside the closed pressure cooker. The trapped
steam increases the internal pressure and temperature.
After use, the pressure is slowly released so that the vessel
can be safely opened.
PAGE 3
Analysis
In our analysis of the problem the following figures were obtained
1. Design #1 a. Maximum Principal Stress
b. Maximum Shear Stress
PAGE 4
c. Total Deformation
d. Maximum Compressive Stress
2. Design #2
a. Maximum Principal Stress
PAGE 5
b. Maximum Shear Stress
PAGE 6
c. Total Deformation
PAGE 7
d. Maximum Compressive Stress
3. Design #3 a. Maximum Principal Stress
PAGE 8
b. Maximum Shear Stress c. Total Deformation
d. Maximum Compressive Stress
PAGE 9
Objective
To obtain the data when a pressure cooking vessel is
subjected to various degrees of varying loading, thermal
and physical.
Three types of materials used for the pressure cooker body
were considered.
To identify the best design out of the analyzed ones.
PAGE 10
Material Selection
The three materials that we chose were:
1. Structural Steel
2. Stainless Steel
3. Aluminum Alloy
PAGE 11
Boundary Conditions
Three types of boundary conditions have been chosen:
1. Pressure = 100 kPa, T= 120°C
2. Pressure = 150 kPa, T= 125°C
3. Pressure = 200 kPa, T= 130°C
These boundary conditions have been so chosen so as to
cover the case of above normal working conditions. These
conditions will test the model under super-normal pressure
and temperature loads.
PAGE 12
CAD Model
DESIGN #1
PAGE 13
DESIGN #2
PAGE 14
DESIGN #3
PAGE 15
Results
Results achieved:-
In all 3 designs, for given pressure and temperature
conditions, cooker having aluminium alloy has maximum
deformation and structural steel has the least.
Stainless Steel has maximum compressive stress for given
conditions.
Maximum stress was observed at the centre of lid and rim of
lid.
PAGE 16
Conclusion
The ME 309a Project really helped a lot to get into the real world analysis
process. We came to know how to model the problem in the software and
look towards the subsequent design changes that can eliminate the cause of
the problem.
We faced several problems while making the CAD models and applying the
various conditions to the model.
In the future work might be done upon increasing the level of complexity
and including various other loading and constraints in the system.
We were assisted by Md. Zahid Ansari sir who guided us throughout the
course of the project.
It was a great experience with the group mates. We learned the concept used
in the real world analysis process and overall it was a great experience.