Impact Testing Machines

Impact tests are designed to measure the resistance to failure of a material to a suddenly applied force. The test measures the impact energy, or the energy absorbed prior to fracture. The most common methods of measuring impact energy are the:

Charpy ImpavtTest:

Izod ImpactTest:

      

Charpy Impact Test

The Charpy test piece rests on alloy steel supports anvils, fitted on the base of the machine rigidly held in position by alien screws. End stopper is provided for quickly & accurately locating the test piece centrally between the supports.

 Izod Impact Test

The Izod test piece is clamped vertically in Izod support anvils, fitted on the base of the machine. The support is provided with a machined vertical groove to suit the test piece size. The front clamp piece & alien screw enable clamping of the test piece in correct height with the help of Izod setting gauge supplied.

Instrumented Impact Test

Most of the test machines can be provided with strain gage or accelerometer instrumentation.  Instrumented test systems enable measurement of the force applied to the test specimen during an impact event.  Then, the instrumented test data can be used to calculate the energy absorbed by the test specimen.  In addition, the crack initiation and arrest loads can be used in fracture mechanics models.