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.
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;
Internal energy losses are caused by:
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