What is ISO 148-3- Charpy pendulum impact test about?
ISO 148-3 is a safety standard on metallic materials.
ISO 148-3 specifies the requirements, preparation, and methods for qualifying test pieces used for the indirect verification of pendulum impact testing machines in accordance with ISO 148-2.
ISO 148-3 also specifies notched test pieces with nominal dimensions identical to those specified in ISO 148-1; however, the tolerances are more stringent.
Note 1: The chemical composition or heat treatment, or both, are varied according to the energy level desired.
Note 2: Reference test pieces are qualified on reference pendulum impact testing machines which are also described in ISO 148-3.
Who is ISO 148-3- Charpy pendulum impact test for?
ISO 148-3 on preparation and characterization of Charpy V-notch test pieces for indirect verification of pendulum impact machines is relevant to:
- Manufacturers of pendulum impact machines
- Corrosion engineers
- Testing authorities for metallic materials
Why should you use ISO 148-3- Charpy pendulum impact test?
The suitability of a pendulum impact testing machine for acceptance testing of metallic materials has usually been based on a calibration of its scale and verification of compliance with specified dimensions, such as the shape and spacing of the anvils supporting the test piece.
The scale calibration is commonly verified by measuring the mass of the pendulum and its elevation at various scale readings. This procedure for the evaluation of machines had the distinct advantage of requiring only measurements of quantities that could be traced to national standards. The objective nature of these traceable measurements minimized the necessity for arbitration regarding the suitability of the machines for material acceptance tests. However, sometimes two machines that had been evaluated by the direct-verification procedures described in ISO 148-3, met all dimensional requirements, were found to give significantly different impact values when testing test pieces of the same material. Successful experience in the use of reference test pieces led to the requirement in ISO 148-2 that indirect verification should be performed using reference test pieces in addition to direct verification. The purpose of ISO 148-3 is to specify the requirements, preparation, and methods for qualifying test pieces used for the indirect verification of pendulum impact testing machines.
Overall, ISO 148-3 is useful as it provides guidance on the pendulum impact testing machine which is used for industrial, general, or most research-laboratory testing of metallic materials.