ATRONA Material Testing Labratories, Inc.
Years of Experience Ready to Work for You "Our primary Objective is to simply meet or exceed our clients needs and expectations."
Impact Testing
ATRONA performs special and custom made impact testing on Chisels, Hammers, and other products. Charpy impact testing is conducted per ASTM E23. Before looking at impact testing let us first define what is meant by 'toughness' since the impact test is only one method by which this material property is measured. Toughness is, broadly, a measure of the amount of energy required to cause an item - a test piece or a bridge or a pressure vessel - to fracture and fail. The more energy that is required to break the specimen the tougher the material. The area beneath a stress/strain curve produced from a tensile test is a measure of the toughness of the test piece under slow loading conditions.
There are two main forms of impact test, the Izod and the Charpy test. Both involve striking a standard specimen with a controlled weight pendulum travelling at a set speed. The amount of energy absorbed in fracturing the test piece is measured and this gives an indication of the notch toughness of the test material. These tests show that metals can be classified as being either 'brittle' or 'ductile'. A brittle metal will absorb only a small amount of energy when impact tested; a tough ductile metal will absorb a larger amount of energy.
| Standard Charpy-V notch specimen |
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Charpy testing machine |
