report of fem project

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

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.

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.

Analysis

In our analysis of the problem the following figures were obtained

1. Design #1 a. Maximum Principal Stress

b. Maximum Shear Stress

c. Total Deformation

d. Maximum Compressive Stress

2. Design #2

a. Maximum Principal Stress

b. Maximum Shear Stress

c. Total Deformation


3. Design #3 a. Maximum Principal Stress

b. Maximum Shear Stress c. Total Deformation


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.

Material Selection

The three materials that we chose were:

1. Structural Steel

2. Stainless Steel

3. Aluminum Alloy

Boundary Conditions

Three types of boundary conditions have been chosen:

1. Pressure = 100 kPa, T= 120°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.

CAD Model

DESIGN #1

DESIGN #2

DESIGN #3

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.

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.

report of fem project

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