A Charpy test (ASTM E23) determines the amount of energy absorbed by a material during fracture. It usually comprises of three V-notched, U-notched, or unnotched bars of metallic materials.

Properties noted are ft-lbs or Joules, and if required lateral expansion and percent of shear fracture. Specimens can be full size (10 mm x 10 mm x 55 mm) or scaled to fit thickness of plate.

Test temperature is important factor. Tensile Testing's can test from +212 to -320ºF (+100 to -195ºC)