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Conventional impact tests (without instrumentation) are performed to measure the energy required to break a notched specimen under dynamic loading. Instrumented impact tests not only measure the notched specimen breaking energy but also quantify the energy required to form a crack at the root of the notch and the energy required to propagate the crack through the material. Instrumented test systems use strikers which have strain gages so that the load-deflection curve during the impact event can be derived. These data provide load, deflection, and energy data which can be correlated with engineering parameters such as fracture toughness, ductility, and fracture resistance.
Plastics, Polymers, Charpy impact tests, Impact testing, Mechanical testing, Mechanical properties of materials, Test equipment, Test specimens, Specimen preparation, Shape, Notches, Dimensions, Force measurement, Deflection tests, Equations, Mathematical calculations, Impact strength, Strength of materials, Mass, Bibliography
The American Society for Testing and Materials published the first test standard for plastics in 1937. These 21 papers presented at an ASTM symposium held in November 1998, while demonstrating how sophisticated test standards have become, also address their limitations. Papers are organized by the m
Plastics, Polymers, Charpy impact tests, Impact testing, Mechanical testing, Mechanical properties of materials, Test specimens, Testing conditions, Brittleness, Toughness, Thermoplastic polymers, Thermosetting polymers, Reinforced materials, Fibres, Sheet materials, Laminates, Reinforcing materials, Preferred sizes, Dimensions