Charpy Impact Testing - Factors and Variables

 

Charpy Impact Test also known as the Charpy V-Notch test, is used for measuring the amount of energy that a material absorbs at the time of fracture. The “Strain Rate” test is conducted in a standardised form, and the energy absorbed reveals a material notch’s toughness.

 

Factors and Variables of the Charpy Notch test

 

The Charpy test apparatus includes a pendulum with a known height and weight that is dropped from a given height and impacts the notched specimen. An important factor is the energy absorbed, determined by measuring the pendulum’s height before and after the impact/fracture. The size and dimensions of the notch are also important as these factors impact the test results. The test may also have several variables, as described below.

 

        I.            Significant variations in the test results will be obtained because of the variations in the product form (for instance, plate or forging).

 

      II.            The manufacturing process may impact the cleanliness of the materials like steel, and hence the process itself may cause variations.

 

    III.            Changes that occur to the working directions impact the properties of the material and hence, the test results. Therefore, the fabrication process may also be a cause of variations. 

 

    IV.            Pre-heat treatment may also be a cause of variations.

 

      V.            Other associated factors, like the installation of the testing machine itself, may also result in variations.

 

The high quality Charpyimpact testing machine provided by leading suppliers and manufacturers can bring in the most reliable results and determine the toughness of material accurately. The machine is made using high-quality steel and other equipment and materials, thus least number of variations and errors affect the results. For instance, a good quality Charpy test machine positions itself accurately, which reduces errors. The pendulum is captured automatically after a test is over, and the starting angles are also changed for the specific test. All of these features result in better accuracy, and the result data can be trusted. Hence it is essential to procure your Charpy test machine from a leading manufacturer with a good market reputation and quality range of products that comply with the international standards.

 


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