Electronic Universal Testing Machine is designed for
testing materials and other materials under tension,
compression bending, transverse and shear loads.
Hardness test on metals can also conducted.
Machine Consists of –
Straining unit :
This consists of a cylinder motor with chain and sprocket
drive and a table coupled with the ram of the hydraulic
cylinder, mounted on to a robust base.
The cylinder and the ram are individually lapped to
eliminate friction. The upper cross-head is rigidly fixed to
the table by two strengthened columns.
The lower cross-head is connected to two screwed
columns which are driven by a motor. Axial loading of the
ram is ensured by relieving the cylinder and ram of any
possible side loading by the provision of ball seating.
An displacement scale, with a minimum graduation of
1mm, is provided to measure the deformation of the
specimen. Tension test is conducted by gripping the test specimen
between the upper and lower cross-heads.
Compression, transverse, bending, shear and hardness tests
are conducted between the lower cross-head and the table.
The lower cross-head can be raised or lowered rapidly by
operating the screwed columns, thus facilitating ease of fixing of the test specimen. Typical HGFL design includes a basic universal testing machine frame with open type crossheads and hydraulic wedge action grips.
The Control Panel consists of a power pack complete with drive motor and an oil tank, control valves and electronic display unit.
The power pack generates the maximum pressure of 200 kgf/cm2. The hydraulic pump provides continuously non-pulsating oil flow. Hence the load application is very smooth.
Hand operated wheels are used to control the flow to and from the hydraulic cylinder.
The regulation of the oil flow is infinitely variable. Incorporated in the hydraulic system is a regulating valve, which maintains a practically constant rate of piston movement.
Control by this valve allows extensometer reading to be taken.
Another Power pack is used to operate wedge action grips by
means of hydraulic cylinder by using solenoid valve operation
For Hydraulic Wedge action grips separate control remote is provided with selector switches indicating clamp - declamp and null positions.
Principle of Operation for - Model: UTES-HGFL
UTM right control valve is Servo Controlled in close loop
mode as per mode selection. Following control modes
1) Standard Manual control
2) Load rate control
3) Elongation rate control
4) Load hold mode
Also Auto start, Potentometric start &initial value open start options are available for test start to take care of slippage & different specimen types.
Load is applied by a hydrostatically lubricated ram.
Main cylinder pressure is transmitted to the pressure
transducer housed in the control panel.
The transducer gives the signal to the electronic display unit, Corresponding to the load exerted by the main ram.
Simultaneously the encoder fitted on the straining unit gives the mechanical displacement.
Electronic Control Panel (SERVO):
In electronic panel 8085 microprocessor is used for basic
Operation & an 8 bit dedicated micro controller is used
for close loop & Servo control.
Panel is having parallel printer port.
RS 232 C serial port for PC interfaces.
2 lines x 8 digits 7 segment display & membrane keyboard for data entry.
20 data sets and 50 results storage.
Accuracy and Calibration:
Electronic Universal testing machine is closely controlled
for sensitivity, accuracy and calibration during every stage
Machine is calibrated over each of its measuring range in
accordance with the procedure laid down in British
standards 1610: Part1: 1992 and IS 1828: Part1: 1991.
Electronic Universal Testing Machine complies with Grade
“A” of BS: 1610:Part1:1992 and class 1 of IS-1828-
Technical Specifications for - Servo Controlled Hydraulic Grip Front Loading Universal Testing Machine Series: UTES-HGFL
Standard Software Package - Tension & Compression test Software package for Model: UTES-HGFL
Wide range of Control Modes with Input Data entry.
Load Vs Extension
Displays graph for extensometer readings against load with proof lines for proof stress.
Real Time Graph
Real time values of load & displacement/extension
used for plotting its graph & can be seen real time
Batch test reports with statistics for batch sample results.
Graph Superimpose with Point Tracing
Graph comparison, superimpose of batch sample tests with point tracing facility.
Windows based software available for -
Online graph on PC, Data analysis, Statistics,
Point tracing, superimposing graphs to compare
with standard, zooming graph etc.