EN ISO 148-2:2016 PDF

Overview

EN ISO 148-2:2016 - Metallic materials - Charpy pendulum impact test - Part 2: Verification of testing machines specifies how to verify pendulum-type Charpy impact testing machines used for measuring the toughness of metallic materials. Published by CEN/ISO, the standard applies to machines fitted with 2 mm or 8 mm strikers and covers constructional elements, overall performance and the accuracy of absorbed-energy results (used, for example, with ISO 148‑1 test methods). It applies to a range of machine designs and capacities and distinguishes industrial machines from more stringent reference machines (see ISO 148‑3 for reference-machine specifications).

Key topics and technical requirements

• Two verification methods
  • Direct (static) verification: Measurement of critical machine parts (pendulum geometry, anvils, supports, indicating equipment) using instruments traceable to national/international standards.
  • Indirect (dynamic) verification: Use of reference test pieces to verify points on the absorbed-energy scale; reference-piece requirements are specified in ISO 148‑3.
• Combined requirement: A machine is not compliant until it passes both direct and indirect verification and meets the requirements in Clause 6 (direct) and Clause 7 (indirect).
• Energy assessment: The standard explains how to separate the total absorbed energy into fracture energy of the test piece and internal energy losses of the machine (e.g., air resistance, bearing friction, pointer friction). Some losses (foundation shock, frame vibration) are noted as not having suitable measurement methods.
• Documentation and uncertainty: Clauses cover verification reporting, frequency of verification, and evaluation of measurement uncertainty (see Annexes A and B). Annex C describes a jig method for geometric verification.
• Traceability and calibration: Instruments and mass/height measurements used in direct verification must be traceable to national/international standards.

Applications and users

This standard is used for:

• Metallurgical and mechanical testing laboratories performing Charpy impact tests
• Calibration and quality assurance teams verifying impact machines for production inspection
• Manufacturers and suppliers of testing equipment to demonstrate compliance
• Procurement and inspection in industry where Charpy values affect material acceptance
• Research labs ensuring comparability of toughness data

Practical benefits include improved inter-machine agreement, reliable calibration of absorbed-energy scales, and documented traceability for material acceptance or regulatory compliance.

Related standards

• ISO 148‑1: Charpy test method (test procedure)
• ISO 148‑3: Preparation and characterization of Charpy V‑notch reference test pieces (used for indirect verification)

Keywords: EN ISO 148-2:2016, Charpy pendulum impact test, verification of testing machines, pendulum impact testing machines, direct verification, indirect verification, reference test pieces, calibration, absorbed energy.