2. What is Impact test?
• The impact test is a method for evaluating the toughness and notch
sensitivity of engineering materials.
• It is usually used to test the toughness of metals, but similar tests are used
for polymers, ceramics and composites.
4. Charpy Impact Test
• The Charpy impact test, also known as the Charpy V-notch test, is
a standardized high strain-rate test which determines the amount of energy absorbed by a
material during fracture.
5. How Charpy Impact Test Works?
• The pendulum is dropped from a specific height to put an impact on a notched sample.
The notch used in the test must be of regular dimensions as it has a great impact on the
test results. The size of the samples also has a great impact on the test results hence it is
essential to choose standard sizes of the specimen. With the help of the Charpy Impact
Test, one can easily analyze the strength of material. The quantitative results of the test
give the understanding of the amount of force that a material can absorb when it reaches
the point of fracture or failure. The qualitative results of the test procedure can provide
information about the ductility of the materials being tested.
6. Applications of Impact Test
• In forging industry, the Charpy impact test can be used to determine the malleability
and ductility of a material that is being forged.
• In the rubber industry, the test can be used for determining the shock absorbing
ability of a type of rubber so that its proper application could be decided.
• In plastic industry, the test is used for analyzing the breaking strength of a sample
when it is subjected to a high impact from a pendulum. This helps in ensuring that
the material is best for an application where it is subjected to such impacts.
7. Izod Impact Test
• The test is similar to the Charpy impact test but uses a different
arrangement of the specimen under test.The Izod impact test differs from
the Charpy impact test in that the sample is held in a cantilevered beam
configuration as opposed to a three-point bending configuration
8. How Izod Impact test Works?
• A test specimen having a V-shaped notch is fixed vertically, and the specimen
is broken by striking it from the same side as that of the notch by the use of
the hammer. The fracture energy is determined from the swing-up angle of
the hammer and its swing-down angle. The Izod impact value (J/m, kJ/m2)
is calculated by dividing the fracture energy by the width of the specimen.
9. Application of Izod Impact Test
• Izod test is also used to evaluate the materials for overall hardness. It's not
applicable to compound materials because of the influence of complicated
and failure modes.
