Differences of Cantilever‑Beam and Charpy Impact Testers

Cantilever‑beam impact testers and simply‑supported‑beam (Charpy) impact testers are mainly used to measure the impact toughness of non‑metallic materials, including rigid plastics, reinforced nylon, glass‑fiber‑reinforced plastics, ceramics and electrical insulating materials.

The simply‑supported‑beam impact test is simple to perform. It is a common testing method for product quality control as well as for comparing the toughness of structures or finished products. The cantilever‑beam (Izod) impact test is another method for measuring material brittleness or toughness. It is especially critical for materials that cannot be fractured in simply‑supported‑beam impact tests.

In the modern rubber‑and‑plastics chemical industry, quality‑inspection departments and research institutes need to detect the impact resistance of different non‑metallic materials under dynamic loads so as to determine their impact toughness. Cantilever‑beam impact testers and simply‑supported‑beam impact testers are the instruments used for such measurements.

Cantilever‑Beam Impact Test Procedure

Lift the pendulum and latch it onto the pendulum‑holding mechanism. Hold the specimen with the notch facing right and place it in the middle of the groove. Slide the centering block in parallel from the right side of the specimen, so that the centering section of the block aligns with the specimen notch. This ensures the notch center is coplanar with the upper surface of the fixture. Then turn the fixture handle clockwise to clamp the test bar firmly.

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