WTE Power Testing Charpy test

Charpy test

-196 - +20°C

Standards for Charpy Impact Testing of Metals

StandardTitleApplication
ISO 148-1Metallic materials — Charpy pendulum impact test — Part 1: Test methodPrimary international standard for conducting the Charpy test
ISO 148-2Verification of testing machinesUsed for the calibration and verification of pendulum impact testers
EN ISO 148-1European adoption of ISO 148-1Mandatory within the EU under harmonized testing systems
ASTM E23Standard Test Methods for Notched Bar Impact Testing of Metallic MaterialsMost commonly used standard for Charpy testing in the United States
ASTM A370Standard Test Methods and Definitions for Mechanical Testing of Steel ProductsIncludes Charpy impact testing methods for steel products

Specimen Specifications

  • Shape: Rectangular bar, typically 10 × 10 × 55 mm
  • Notch: Usually a V-notch (2 mm deep, 45° angle), sometimes U-notch
  • Test temperature: Can range from ambient to very low (e.g., −20 °C, −46 °C, −196 °C), depending on material/application
  • Impact energy: Most commonly 300 J or 150 J (standard machine energy capacity)

Measured Results

  • Absorbed energy [J] — the energy absorbed during fracture
  • Fracture appearance (brittle/ductile)
  • Optional: lateral expansion, shear area percentage (especially in ASTM)

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