Assignment (ME361)
Due back on 22/09/2014 (After Class)
(Q1) The surface of a work piece to be machined using Electrochemical Machining process is given
by an equation
Y= a + b X + C X2
Assume the equilibrium gap to be ye = / f
Please find the correspondi
SU-8 And Its Features
Anne Samuel
Contents
Introduction
- photoresist
- positive vs negative photoresist
SU-8
- photosenstivity of SU-8
- process
- features
- application
References
Photoresists
Photoresists consists of three components.
- Resin( bind
EE-527: MicroFabrication
Wet Etching
R. B. Darling / EE-527
Outline
Isotropic Si etching
Anisotropic Si etching
Anisotropic GaAs etching
Isotropic etching of SiO2, Al, and Cr
General features of wet chemical etching
Selective etching and etch stops
Intere
Engineering Stress strain
Numerical 1.
ECu= 110GPa
A specimen of copper having a rectangular
cross section 15.2 mm 19.1 mm (0.60 in.
0.75 in.) is pulled in tension with 44,500 N
(10,000 lb ) force, producing only elastic
deformation. Calculate the resulti
1) From the following data, plot the stress vs. strain curve. Also find modulus of
elasticity, yield strength, tensile strength and % elongation. Original diameter =
12.8 mm, Original length = 50.80 mm
Load (N)
12700
25400
38100
50800
76200
89100
92700
10
Engineering Stress strain
1. A specimen of copper having a rectangular cross section 15.2 mm 19.1 mm (0.60 in.
0.75 in.) is pulled in tension with 44,500 N (10,000 lb ) force, producing only elastic
deformation. Calculate the resulting strain. ECu= 110GPa
True Stress and True Strain
1) From the following data, plot the stress vs. strain curve. Also find modulus of
elasticity, yield strength, tensile strength and % elongation. Original diameter =
12.8 mm, Original length = 50.80 mm
Load (N)
12700
25400
3810
A cylindrical rod of Nickel 100.00 mm
long and 8.000 mm diameter is
heated from 20 C to 200 C while its
ends are maintained rigid, determine
change in diameter.
= 13.3 x 10-6 C-1 for Nickel, E = 207
GPa, = 0.31, y = 138 MPa
Solution
Poissions ratio = -x
Hardness Tutorial
Question
A 10mm diameter Brinell hardness indenter produced
an indentation of 2.5mm in diameter in a stee; alloy
when a load of 1000kgf was used. Compute the HB
of this material.
Solution
Diameter of indenter (d)= 10mm
Diameter of ind
Find DBTT at the average of maximum and minimum
impact energy and also find DBTT at 50 J from the
following data
Temperature (0C)
Impact Energy (J)
-25
104
-50
103
-75
97
-100
63
-113
40
-125
34
-150
28
-175
25
-200
24
0
105
110
105
100
95
90
85
80
75
70
To develop and observe the microstructure
of the steel under optical microscope
Under :Optical Microscope
Image-1
2% Nital
100X
Image-2
Microstructure shows :
Ferrite and Pearlite structure.
ASTM Grain Size No: 7-8
500X
To develop and observe the microstr
Strength of Material & Rock
Tutorial -1
Relevance, Importance & Application of
Strength of Strength of Material in
Petroleum Engineering.
Tutorial-2
Titanic ship disaster ? Reason
- Main material causes for failure.
- Other cause if any
Machining Science II- Lecture 5
Instructor: Shantanu Bhattacharya
Review of Last Lecture
Photolithography (Contact, Proximity and
Projection Lithography).
Resolution in lithography.
Chemical Mechanisms of resist and process
steps of using mask aligner.
Machining Science II- Lecture 5
Instructor: Shantanu Bhattacharya
Review of last lecture
Basics of plasma
DC glow discharge, RF plasma and Magnetically
Enhanced plasma.
Commercial plasma system Trion.
Plasma etching methodology.
Plasma modification a
Review of previous lecture
Dimensional inconsistency
in the MRR value.
Shaws approximation
Numerical problem of
estimating the time of
machining.
Numerical Problems
Find out the approximate value of the time
required to machine a square hole (5mm X5mm
Machining Science II- Lecture
10& 11
Instructor: Shantanu Bhattacharya
Review of previous lecture
Re-solving of numerical problem on USM.
Ultrasonic machining unit.
Acoustic head (design of head to be done later).
Feed mechanisms for USM.
Tool design cons
Machining Science II- Lecture
10& 11
Instructor: Shantanu Bhattacharya
Review of previous lecture
Re-solving of numerical problem on USM.
Ultrasonic machining unit.
Acoustic head (design of head to be done later).
Feed mechanisms for USM.
Tool design cons