IzodSchlagtest

IzodSchlagtest, commonly referred to as the Izod impact test, is a pendulum-type method used to determine the impact resistance or notch toughness of a material, especially polymers and plastics. The test measures the energy required to fracture a notched specimen, providing a quantitative indication of toughness and flaw sensitivity under rapid loading.

In the procedure, a notched rectangular test specimen is mounted in a fixed fixture with the notch oriented toward the falling pendulum. The pendulum strikes the specimen at a prescribed location, and the energy absorbed to fracture the specimen is inferred from the difference in the pendulum’s energy before and after impact. The result is reported as impact strength or notched impact energy, typically expressed as energy per unit area (for example kJ/m^2).

Standards and reporting for the Izod test are given by organizations such as ASTM and ISO. The most common specification is ASTM D256 for plastics, with ISO 180 providing a corresponding standardized approach. These standards define specimen geometry, notch dimensions, test temperature, and the method for calculating and reporting absorbed energy. There are variant configurations, notably the Izod (notch facing the striker) and Charpy configurations, which differ in specimen support and hammer geometry.

Interpretation and use of results: Izod impact values reflect material toughness under rapid loading and are influenced by temperature, notch geometry, and material orientation. They are widely used for comparing polymers and composites, guiding material selection, quality control, and failure analysis. Limitations include sensitivity to testing conditions and the fact that notched Izod results may not directly predict performance under all service conditions.