Impact Test on Steel (Izod Method)
Introduction
The Izod impact test was named after English engineer Edwin Gilbert Izod, who first described the test method in 1903. An impact test signifies toughness of material that is ability of material to absorb energy during plastic deformation. Impact test reveals the susceptibility of a metal to brittle fracture. Toughness takes into account both the strength and ductility of the material. Several engineering materials have to withstand impact or suddenly applied loads while in service. Impact strengths are generally lower as compared to strengths achieved under slowly applied loads. Of all types of impact tests, the notch bar tests are most extensively used. Therefore, the impact test measures the energy necessary to fracture a standard notch bar by applying an impulse load. The test measures the notch toughness of material under shock loading. Values obtained from these tests are not of much utility to design problems directly and are highly arbitrary. Still it is important to note that it provides a good way of comparing toughness of various materials or toughness of the same material under different condition. This test can also be used to assess the ductile brittle transition temperature of the material occurring due to lowering of temperature.
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Objective(s) of the Experiment
This test is carried out to determine the energy absorbed in breaking notched steel specimens using the Izod test. The energy value is a measure of toughness of the material.
Equipments Needed
Procedures
Results and Reports
Precaution
References
Credits: Samuel Alalade. Obafemi Awolowo University, Ile-Ife, Osun State, Nigeria.