Charpy Impact Test Apparatus

Posted on May 21, 2021 / 344
Location : Karachi


The Impact testing machine is designed for determination of resistance to fracture of materials by charpy test.

The Machine is constructed with a heavy base and support columns. The Pendulum is hung on ball bearings. A pendulum ring is also provided for safety purpose.

General Experiments

1- Determination of notched bar impact work.
2- Determination of notched bar impact strength.
3- Influence of notch form on impact work.
4- Influence of Materials heat treatment and temperature on impact work .

Technical Specifications

As a fast & economical test, it is used more as a comparative test rather than a definitive test where the Charpy test specimens normally measure 55x10x10mm. Further, these have a notch that is machined across one of the large faces. Recommended test materials are plastic and iron. The lift angle of the hammer is adjusted to start from approximately 145 Deg to 155 Deginclination & the maximum energy limit is 25 joules.

Test Significance

Charpy test assists in measuring the energy absorbed by standard notched specimen while breaking under impact load and is economical quality control method for determination of notch
sensitivity as well as impact toughness of engineering materials. The test is commonly used on metals as well as also on ceramics, polymers and composites.

The notches may be in form of:
 V-notch
 U-notch/keyhole notch

Charpy Testing machine performs test on metals as well as on polymers, ceramics as well as composites and is commonly used for evaluating relative toughness/impact toughness of materials. This makes the test useful in quality control applications.

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