Overview
EN ISO 14556:2023 - Metallic materials - Charpy V‑notch pendulum impact test - Instrumented test method - specifies an instrumented Charpy V‑notch pendulum impact test and the requirements for measurement and recording equipment. Building on the conventional Charpy pendulum test (ISO 148‑1), this instrumented method records force‑displacement and energy data during impact to give additional insight into fracture behaviour of metallic products. Results are intended for material characterization and research and shall not be used directly for structural design or safety calculations.
Key topics and technical requirements
- Scope and purpose: Defines the instrumented Charpy test as a supplement to the standard Charpy pendulum test to study fracture behaviour under impact conditions.
- Apparatus: Requirements for the pendulum testing machine and instrumented strikers, including examples (Annex A).
- Instrumentation and calibration: Traceable measurement of force, displacement and energy; calibration procedures and intervals; recording apparatus requirements.
- Characteristic values: Definitions and determination of force and displacement metrics such as general yield force, maximum force, unstable crack initiation force, crack arrest force, and corresponding displacements; evaluation of force‑displacement curves and impact energy parameters.
- Test pieces: Standard specimen geometry and requirements; provisions for miniature test pieces (normative Annex D) and related measurement considerations.
- Test procedure and reporting: Stepwise test conduct, data evaluation and mandatory items in the test report (including test piece type - standard, subsize or miniature).
- Limitations: Explicit statement that instrumented Charpy results are not directly transferable to component/structure design or safety assessments.
- Normative and informative annexes: Examples of strikers, calibration blocks, formulas for estimating ductile fracture proportion, and bibliography for further reading.
Applications and users
This standard is used for:
- Materials R&D to study dynamic fracture processes and compare alloys or heat treatments.
- Metallurgical quality control where additional fracture‑mode information is needed beyond absorbed energy.
- Fracture mechanics and toughness research for deriving characteristic forces and displacements from impact events.
- Test laboratories and certification bodies implementing instrumented impact testing with traceable instrumentation.
Typical users: testing laboratories, steel and alloy producers, research institutes, failure‑analysis teams, and engineers working on material characterization.
Related standards
- ISO 148‑1 - Charpy pendulum impact test - Part 1: Test method (base Charpy test)
- ISO 148‑2 - Charpy pendulum impact test - Part 2: Verification of testing machines
Keywords: EN ISO 14556:2023, instrumented Charpy V‑notch, pendulum impact test, metallic materials, force‑displacement curve, calibration, impact energy, fracture behaviour.
