Charpy and Izod Impact Testing

Charpy and Izod Impact Testing

The Charpy or the Izod impact test is carried out by testers using a pendulum impact testing apparatus. A device having a swinging pendulum that is released to strike a secured specimen is referred to as a pendulum impact testing machine or a pendulum impact tester. A weighted hammer on the end of the pendulum strikes the sample material.

Metals, metallic alloys, or plastic materials can all be used as test specimens for impact testing.

The specimen will have a V-shaped notch or a U-shaped notch. If specimens don’t have notches, they may become malformed. When there are no notches in the material, the test results may also be inconsistent.

The notches on the sample material are cut by testers using a notch cutter or broaching equipment. A V-shaped notch has a depth of 2 mm, whereas a U-shaped notch has a depth of 5 mm.

Before testing, materials are frequently heated or cooled down. This is for testing samples that have been exposed to various temperatures. The samples could go through a number of tests at particular temperatures. Results from tests are occasionally the average of five samples.

The operator lifts and locks the pendulum at a predetermined height before conducting the impact test. The specimen is then set on a support within the striking anvil by the tester. The tester checks to see that the specimen is securely fastened.

Then a dial or indicator is reset. The tester releases the pendulum to strike the specimen after performing a few safety checks. If there isn’t a break, the tester can use a bigger hammer.

The tester determines how much energy the material absorbed following impact. This is the variation in the pendulum’s height between the beginning and the impact blow.

One of the most often used impact test techniques is still the Charpy impact test. This is primarily due to how simple it is to prepare test samples. The computation of results is also fairly simple.

Izod impact and Charpy tester equipment are essentially the same. However, there are several variations, such as how the material is oriented in the impact tester.

The main variations between the two tests are as follows:

• The Sample Material’s Location
• Before the hit, the specimen’s two ends are fastened.

The sample is cantilevered vertically during the Izod impact test. Only the lower portion of the specimen is secured. At a specified location, the specimen’s unlocked end is struck by the pendulum hammer.

Face Notch

The notch on the Charpy tester is angled away from the pendulum arm. The notch faces the pendulum in the Izod impact test.

Various Notches

The notched part bears the brunt of the impact’s stress. The notched areas are where specimens break.

The Pendulum Charpy impact tester accepts specimens with either a V-shaped or U-shaped notch.The only notches present in specimens for the Pendulum Izod impact tester are V notches. Specimens can have up to three V notches for Izod impact tests. For conducting tests that require some averaging, this arrangement works well. During this kind of examination, the material is broken down one piece at a time. The center of the charpy test specimens is only slightly notched.

Impact Point

The center of the specimen is struck by the hammer during the Charpy impact test.

In the Izod impact test, the specimen is struck by a hammer at a certain location above the notch.

Hammer Strike Type

A rounded hammer pin is found on older Charpy devices.

The striker on the Izod impact testing device is shaped like an agricultural hammer.

Kind of Samples

For steel items, charpy impact tests are used. Metal and plastic specimens are tested using Izod impact tests.

Dimensions of the Sample

For Izod testing, the standard specimen sizes are 127 x 11.43 mm and 63.5 x 12.7 x 3.2 mm bar (for plastics) (round metal bar)

For Charpy tests, the standard specimen size is 10 mm x 10 mm x 55 mm (metal bar)

Several specimens can be tested using modern Charpy machines. The specimens are kept in a tower magazine that is traveling along a motor conveyor belt.

ASTM A370 requirements must be met for a Charpy impact test. A series of techniques for testing steel products are covered under ASTM A370. The standard also specifies testing definitions for tension, bend, and hardness in addition to impact test standards.

The Charpy Impact test described in ASTM A370 comprises directions for evaluating steel. The ASM A370 also applies to products made of stainless steel and other alloys.

Other standards besides ASTM A370 should also be followed when conducting tests.

The test procedures for Charpy and Izod testing of notched bar samples are described in ASTM E23. Izod impact testing must adhere to ASTM D256 requirements. The test procedures used to measure polymers’ impact resistance are covered by ASTM D256.

Impact Testing by Material Testing Providers Charpy and Izod

Pendulum impact testers are produced by a number of top companies, including Infinita lab Material Testing, Inc. One of the most cutting-edge Charpy Impact Testers is available for purchase. The business sells apparatus for measuring metal hardness and tension. Moreover, they have equipment for evaluating plastic and rubber.

One Izod Impact Tester is not available for purchase from the company. Yet, they have one built to withstand both Charpy and Izod impact tests. They also have several Charpy testing tools with cutting-edge features.

The company Infinita lab Material Testing, Inc. offers affordable, high-quality equipment. The foundation that the business has laid is one of the reasons they are able to accomplish this.

They have taken out the middleman, which is another justification. They enable the business to keep up a high production volume with minimal overhead. Additionally, the business provides its clients with services and product training.

The most recent software is installed in the impact testers that Infinita lab Material Testing, Inc. provides. The staff can operate the equipment more easily thanks to this cutting-edge software.