Tensile testing machine

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 1 Tensile 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. Tensile Testing 2

3. Types of tensile testing On the basis of the working principle, tensile testing machines can be categorized into three major categories. Tensile Testing 3

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. Tensile Testing 4

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. Tensile Testing 5

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. Tensile Testing 6

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. Tensile Testing 7

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. Tensile Testing 8

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. Tensile Testing 9

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. Tensile Testing 10

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 Tensile Testing 11

12. Thank You Tensile Testing 12