ISO 148-2:1998 pdf download.Metallic materials一Charpy pendulum impact test
This part of ISO 148 covers the verification of the constructional elements of pendulum-type impact testing machines. it is applicable to machines with 2 mm or with 8 mm strikers used for pendulum impact tests carried out, for instance, in accordance with ISO 148-1.
It can analogously be applied to pendulum impact testing machines of other capacities and of different design.
Impact machines used for industnal, general or research laboratory testing of metallic materials In accordance with this part of ISO 148 are referred to as industrial machines. Those with more stringent requirements are referred to as reference machines. Specifications for the verification of reference machines are found in ISO 148-3.
This part of ISO 148 describes two methods of verification.
a) The direct method which is static in nature and involves measurement of the critical parts of the machine to ensure that it meets the requirements of this part of ISO 148. The verification equipment shall have a certified traceability to the International Unit System. The direct method shall be used when a machine is being installed or repaired, or if the indirect method gives an incorrect result.
b) The indirect method, which is dynamic in nature, and which use reference test pieces to verify points on the measuring scale.
A pendulum impact testing machine is not in compliance with this part of ISO 148 until it has been verified by both the direct and indirect methods (see clause 12).
The requirements for the reference test pieces are found in ISO 148-3.
NOTE — This part of ISO 148 takes into account the total energy absorbed in fracturing the test piece using an indirect method. This total absorbed energy consists of 1) the energy needed to break the test piece itself and 2) the internal energy losses of the pendulum impact testing machine performing the first half-cycle swing from the initial position. Internal energy losses are due to:
a) Air resistance, friction of the bearings of the rotation axis and the indicating pointer of the pendulum which can be determined by the direct method (see 9.4).
b) Shock of the foundation, vibratIon of the frame and pendulum for which no suitable measuring methods and apparatus have been developed.
2 Normative references
The following standards contain provisions which, through reference in this text, constitute provisions of this part of ISO 148. At the time of publication, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on this part of ISO 148 are encouraged to investigate the possibility of applying the most recent editions of the standards indicated below. Members of IEC and ISO maintain registers of currently valid International Standards.ISO 148-2 pdf download.