Study And Preliminary Design Of High Speed Impact Test Machine Using Hopkinson Bar Test Principle

Alyaa Izzati, Hashim (2010) Study And Preliminary Design Of High Speed Impact Test Machine Using Hopkinson Bar Test Principle. Project Report. UTeM, Melaka, Malaysia. (Submitted)

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Abstract

There are many type of test for materials to determine material properties at high strain rate. The most commonly used method is the split Hopkinson bar test and it is also known as Kolsky bar. The high strain rate is approximately in ranges 104 in/in/sec.The design of this device is presented in research, design, and measurement. The overview of the split Hopkinson bar test are it is consists of two steel bar that sandwich a cylindrical specimen between them. One of the bars is striked by the striker bar, a compressive stress wave is generated that immediately begins to transverse towards the specimen. When it arrives at the specimen, the wave partially reflects back towards the impact bar end. The other part of the wave will transmit through the specimen and into the second bar causing the plastic deformation in the specimen. It is shown that the reflected and transmitted waves are proportional to the specimen’s strain rate and stress. Specimen strain can be determined by integrating the strain rate.A lot of research has been done because most of the data about the split Hopkinson bar test is protected. Many engineers make a research about this method and they come out with several design of split Hopkinson bar test.

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