IRJET- Data Acquisition using Tensile Strength Testing Machine

International Research Journal of Engineering and Technology (IRJET) e-ISSN: 2395-0056
Volume: 06 Issue: 03 | Mar 2019 www.irjet.net p-ISSN: 2395-0072
© 2019, IRJET | Impact Factor value: 7.211 | ISO 9001:2008 Certified Journal | Page 3191
DATA ACQUISITION USING TENSILE STRENGTH TESTING MACHINE
Shravani Shirish Utage1, Snehal Rajendra Parit2, Rutuja Pravin Patil3, Prof. Akshay G.Bhosale4
1,2,3Student Department of Elecronics and Telecommunication Engineering, Sanjay Ghodawat College of
Engineering, Atigre, Kolhapur
4Assistant Professor Department of Elecronics and Telecommunication Engineering, Sanjay Ghodawat College of
Engineering, Atigre, Kolhapur
---------------------------------------------------------------------***----------------------------------------------------------------------
Abstract – One of the most importantcharacteristicsrequired
for design, production quality control and life prediction of
industrial plant is strength of a material. Textilematerials has
been designed, manufactured and its performance tested by
tensile tester.
Key Words: tensile, strength, strain, stress.
1. INTRODUCTION
A universal testing machine is used to test the tensile
strength and compressive strength of material. The
“universal” part of the name reflects that it can be perform
many standard tensile and compression tests on materials.
Scope of our work is interfacing load cell and rotational
encoder and sending information to PC.
The EU funded project TENSTAND addresseda)theissuesof
computer controlled tensile testing, b) validation of tensile
software, c) the issues of speed of testing Tension is
measured by load cells of different measuring materials.
Software routines are developed for different tests which
are includes load-elongation(orstress-strain)curve,tension
change under constant elongation, creep test and force and
elongation lost under cyclic loading.
2. BLOCK DIAGRAM
1. MICRO-CONTROLLER
The microcontroller board based on the AT mega 2560. It
has 54 digital input and output pins. The microcontroller
simply connect it to the computer with a USB cable it with a
battery or AC-to-DC adapter to get started. The operating
voltage of microcontroller is 5v It has 16 Analog pins. This
microcontroller has different typesofspecificationlike1) 86
general purpose I/O lines2) High-performance3)sixflexible
timer/counters with compare modes 4) 8KB SRAM 5) 16-
channel 10-bit A/D converter 6) PWM7)32general purpose
working registers 8) real time counter 9) ISP flash memory
10) oriented 2-wire serial interface
The device accomplish at throughput of 16 MIPS at 16 MHz
and operates between 4.5-5.5 volts.
A single clock cycle executing by powerful instructions, the
device derive a throughput approaching 1 MIPS per MHz,
processing speed and balancing power consumption.
2. LOAD CELL
Strain gauge load cell work on the principle that the strain
gauge (a planer resistor) deforms when the materials onthe
load cells deforms appropriately. In a Wheatstone bridge
configuration a load cell usually consistsoffourstraingauge.
The output voltage of load cell is 2mv/v.
A load cell is converts force into a measurable electrical
output. Although there are manyvarietiesofloadcells,strain
guage based load cells are the most commonly used.
In laboratories where precisionmechanical balancesarestill
used, strain gage load cells dominate the weighing industry.
Where intrinsic safety and hygiene are desired, and
hydraulic load cells are considered in remote locations, as
they do not require a power supply there is Pneumatic load
cells are sometimes used. Strain gage load cells offer
accuracies from within 0.03% to 0.25% full scale and are
suitable for almost all industrial applications.

3. R0TARY ENCODER
Rotary encoder is specifically used to determine the
elongation of specimen we used to measure the tensile
strength. It is used to converts the angular position or
motion of the shaft to analog or digital output signals.
A rotary encoder, also called a shaft encoder, is an electro
mechanical device that converts the angular position or
motion of a shaft or axle to Analog or digital output signals.
Absolute and incremental are two main types of rotary
encoder. The output of an absolute encoder indicates the
current shaft position, making an angle transducer. The
incremental encoder provides output of an information
about the motion of the shaft, which typically is processed
elsewhere into information such as position.
4. ADC
24-bit ADC which is used here is HX711 type. 24-bit ADC is
used here to get the more counts. ADC is interfaced with the
microcontroller 2560 by using the SPI (serial peripheral
interface) protocol.
HX711 is an ADC chip with preamplifier included. It is
designed for weight scales applications. To measure weight
provide voltage outputs in millivolts the load cells usually
used. We can use HX711 microcontroller because outputs
are difficult to handle directly by controllers.
By using ADC converter, regulated power source, output
amplifier (noise reduced) we measure weight usingloadcell
There are all these three features need three separate
different type of circuits and components adding to cost and
complexity all the above features simply removing complex
circuitry So we can use HX711 IC.
5. PC INTERFACE
RS-232 is a standard for serial communication.Thestandard
defines the electrical characteristics & timing of signals, the
meaning of signals, & the physical size & pinout of
connectors.
For a serial communication interface RS232 is a standard
allows to send and receive data via at least three wires. By
using the RS232 interface is easy to setup a connection
between a microcontroller and a PC or between two
microcontrollers.
6. KEYPAD
Here 8*3matrix keypad is interfaced with the
microcontroller. This keypad is used here to give a input
to the system that follows an encoding scheme that allows it
to have much less output pins than there are keys.
Typically in the keypad there is an the one port pin is
required to read a digital input into the controller. When
there are more number of digital inputs that have toberead,
it is not feasible to allocate one pin for each of them. So, the
number of pins of keypad that are used to interface a given
number of inputs decreases with increase in the order of the
matrix Initially all switches are assumed to be released. So
there is no connection between an rows and columns. When
there is any one of the key are pressed, the corresponding
row and column are connect. The colour red and black is
for logic high and low respectively. Here are the steps
involved in determining the key that was pressed.
7. LCD DISPLAY
To display the output 20*4 LCD display is used here. It can
display there are 4 such lines and 20 characters per line. In
this 20*4 LCD display each character is displayed in 5x7
pixel matrix.
3. FLOW DIAGRAM:

WORKING PRINCIPLE
In the machine between the grips and an extensometer the
specimen is placed if required can automatically record the
change in gauge length during the test. The machine itself
can record the displacement between its cross heads on
which the specimen is held If an extensometer is not fitted.
So, this method is records the change in length of the
specimen as well as record all other extending / elastic
components of the testing machine.
It started begins to apply an increasing load on specimen.
The load and extension or compression of the specimen
record the tests the control system and its associated
software.
4. ELECTRONIC DESIGN
Electronic system of the device and signals. By a personal
computer (PC) Motor is controlledanddata isreadfromload
cell. Digital signals of encoder are read and recorded by PC.
Encoder signals are read to determine the position of servo
motor and hence displacementofmovableclamp. Througha
data acquisition card the Communication between servo
motor, load cell signal and PC is possible.
5. RESULT AND DISCUSSION
ENCODER
In the Rotary encoder for angle-measuringdevicesitmarked
in 3-bit binary system. There is an differenttypesofringsare
available in that the inner ring corresponds to Contact 1 in
the table. Black sectors are "on". On the right-hand side Zero
degrees is available, with angle increasingcounterclockwise
and also anticlockwise.

In quadrature Two square waves. By the sign of the A-B
phase angle the direction of rotation is indicated which, in
this case, is negative because A Trails B.
DISPLAY:
On LCD display initially it gives valuesofloadandCHT(cross
head travel).
6. CONCLUSIONS
The construction, design and calibration measurement of a
universal testing machine for tensile tests on thin and soft
materials were discussed.
The performance of the proposed testingmachinefollowing
the work done to calibrate the loadcell, used to obtain the
compliance of the machine, and the data acquisition are
discussed.
REFERENCES
[1] T. Tsuchiya, O. Tabata, J. Sakata (Journal of
Microelectromechanical Systems-1998). Specimen size
effect on tensile strength of surface-micromachined
polycrystalline silicon thin film.
[2] K. Yagi, M. Tokuda, T. Ueda (Micro-
Nanomechatronics and Human Science 2004)
Evaluation of the tensile strength properties by the
difference in the degree of polymerization of PVA gels
[3] Haidong Z, Ikuo Shohji, Masayoshi Shimoda
(IEEE2014). Effect of temperature on tensile properties
of highmelting point Bi system solder.

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IRJET- Data Acquisition using Tensile Strength Testing Machine