This slide is about tensile testing machine Introduction of testing machine Types of tensile testing CRL CRT CRE Ballistic tensile tester Instron textile tester Lea strength tester High volume fiber tester Textile Engineering

1. Tensile Testing Machine Presented by
Md Faisal Ahmed Biplob
ID: 191003045
Batch: 191 D(2)
Dept. of Textile Engineering
GUB
Presentation on
1Tensile Testing

2. Introduction
• A yarn’s tensile property
can be defined as the
maximum force/load that
is required to break the
material. It is a parameter
of vital importance
regarding the fabrication
of yarn because it directly
influences the strength of
the developed fabrics.
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3. Types of tensile testing
• On the basis of the working principle, tensile testing machines can be categorized
into three major categories.
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4. Constant Rate of Load (CRL)
• The machines apply the load on
the test sample, which is
increased constantly with time.
The specimen is free to elongate
and its extension depends on its
properties for any applied load.
The working principle of the lea
strength machine is of this
category.
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5. Constant Rate of Extension (CRE)
• The machines have a constant rate of
elongation of the specimen; as the load
increases there is negligible movement
of the measuring mechanism. The
working principle of the Tensorapid-4,
which is used to evaluate the tensile
strength of a single yarn, is a constant
rate of elongation.
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6. Constant Rate of Traverse
• In this type of machine two pulling
clamps are used to evaluate the tensile
strength of the sample. One clamp
moves with constant speed and
application of the load is done by the
second clamp, which is responsible for
the activation of a load measuring
mechanism. Normally old machines
use this mechanism, such as the old
fabric tensile strength testing machine.
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7. Tensile Testing Machine
• Ballistic tensile tester
Tensile Strength of a single fiber can be determined by Ballistic
Tester and the test carried out by Ballistic Tester is called Ballistic
Test. Ballistic Tester contains a pendulum. A specimen of fiber is
placed in the way of pendulum of Ballistic Tester.
Pendulum is released from a given angle to the vertical and on its
swing, it engages with one of the specimen jaws and break one of
the jaws. Tensile strength of specimen is determined by the energy
lost by pendulum when it contacted with specimen jaw and this
energy is the one which was, in actual, needed by the pendulum to
break the fiber. Ballistic Test is more rapid than a normal Load-
Elongation Test.
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8. Tensile testing machine
• Instron Tensile tester
Instron Tensile Tester acts on the principle of Constant Rate of
Elongation. In Constant Rate of Elongation, the specimen is extended
at a constant rate and the force is a dependent quantity.
In Instron Tensile Tester, one end of the specimen is clamped in jaws,
which are mounted on a cross-head that is traversed at a constant rate
by mechanical drive. The drive comes from a computer-controlled
stepper motor. The other end is clamped in jaws which are mounted
on a stiff load cell containing a strain-gauge.
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9. Tensile testing machine
• Lea Strength Tester
Lea strength tester is used for determining the Tensile Strength and
Elongation of Cotton, Wool, Jute and other textile materials in form
of skein.
The machine consists of a sturdy metal plate base with load
measuring unit fixed at the top and the driving assembly fitted at the
bottom. An electric motor transmits power to the lead screw through
gear box. The pendulum rod is connected with the upper lea holder
through main boss.
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10. Tensile testing machine
• High Volume Fiber Tester
• High volume fiber tester is used to determine fiber properties like length,
strength, micronaire, maturity & color. High volume fiber tester has
following features:
• HVT Expert 1201: Measuring the important fiber properties like
length, strength, micronaire, maturity, moisture & color.
• Less space occupation, less weight and comfortable Stainless Steel
top work space.
• Combined and independent module testing.
• Parallel as well as simultaneous operations ensures faster testing.
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11. Conclusion
• Most modern machines operate on the constant rate
of extension principle where the moving jaw is
driven by a screw thread moving at a constant
rotational speed. The construction of the machine
depends on its ultimate load capacity.
• Mostly all the equipment used for determining
strength, Elongation property and load of extension
of fiber and yarn.
• All the instrument used here are under high volume
Instrument.
That’s all for now
If you have any query, please ask
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12. Thank You
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