EN ISO 148-2 Metallic Materials - Charpy Pendulum Impact Test - Requirements for Verification of Testing Machines

Metal Test Laboratory

EN ISO 148-2 Metallic Materials - Charpy Pendulum Impact Test - Requirements for Verification of Testing Machines

EN ISO 148-2 covers the verification of pendulum impact testing machines in terms of their structural members, their overall performance and the accuracy of the results they produce. It can be applied, for example, to machines with 148 mm or 1 mm counterparts used for pendulum impact tests according to ISO 2‑8.

EN ISO 148-2 Metallic Materials - Charpy Pendulum Impact Test - Requirements for Verification of Testing Machines

It can be applied to pendulum impact testing machines of various capacities and different designs.

In accordance with this part of EN ISO 148, impact machines used for industrial, general or research laboratory testing of metallic materials are called industrial machines. Those with more stringent requirements are called reference machines. Specifications for verification of reference machines are found in EN ISO 148‑3.

EN ISO 148-2 describes two verification methods;

The direct method, static in nature, involves measuring critical parts of the machine to ensure they meet the requirements of this part of EN ISO 148. Instruments used for verification and calibration are traceable to national or international standards.
Dynamic in nature, the indirect method uses reference test pieces to verify points on the measurement scale for the energy absorbed. Requirements for reference test pieces are found in EN ISO 148‑3.

EN ISO 148-2 describes how to evaluate the different components of the total energy absorbed in breaking a test piece. This total absorbed energy occurs in two ways;

  • The energy required to break the test piece itself;
  • Internal energy losses of the pendulum impact testing machine performing the first half cycle swing from the starting position.

Internal energy losses are caused by:

  • The air resistance, the friction of the bearings of the axis of rotation, and the indicator indicator of the pendulum, which can be determined by the direct method;
  • Shaking of the foundation, vibration of the frame and pendulum for which appropriate measuring methods and apparatus have not been developed.
     

EUROLAB assists manufacturers with EN ISO 148-2 test compliance. Our test experts, with their professional working mission and principles, provide you, our manufacturers and suppliers, the best service and controlled testing process in our laboratories. Thanks to these services, businesses receive more effective, high-performance and quality testing services and provide safe, fast and uninterrupted service to their customers.

 

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