Review for Design of Gripper in Universal Testing Machine

Mechanical tensile testing plays an important role in evaluating fundamental properties of engineering materials as well as in developing new materials and in controlling the quality of materials for use in design and construction. If a material is to be used as part of an engineering structure that will be subjected to a load, it is important to know that the material is strong enough and rigid enough to withstand the loads that it will experience in service. Most common type of test used to measure the mechanical properties of a material is the tension test with the help of Universal Testing Machine (UTM). Tension test is widely used to provide basic design information on the strength of materials and is an acceptance test for the specification of materials. In tensile test, a specimen is prepared suitable for gripping into the jaws of the testing machine type that will be used. The specimen used is approximately uniform over a gauge length.UTM have fixtures for holding the test specimen called gripper in which the both ends of the test specimen fitted. Gripper cannot hold the test specimen of larger size which limits to test such specimen. UTM has less floor space so the vertical daylight and diameter of the test specimen cannot exceed than the pre-defined values. To increase the vertical daylight and test specimen size, the change should be made in the gripper design. This work provides valuable intuition of gripper a design.