ISO 148-3:2016 pdf free
ISO 148-3:2016 pdf free.Metallic materials一Charpy pendulum impact test
This part of ISO 148 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.
It 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 this part of ISO 148.
The following referenced documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
ISO 148-1, Metallic materials一Charpy pendulum impact test一Part 1: Test method
ISO 148-2, Metallic materials一Charpy pendulum impact test一Part 2: Verification of testing machines
Ensure that the reference machine is not subjected to external vibrations induced by other equipment in close proximity, such as forging hammers, presses, moving vehicles. The machine shall also be free of excessive vibrations during an impact test.
NOTE Such vibrations can be detected by placing a small container of water at any convenient location on the machine framework; the absence of ripples on the water surface during an impact test indicates that this requirement has been met. Excessive vibration in a machine firmly fastened to the floor indicates the need for a separate foundation and/or the use of vibration isolators.
Direct verification shall be carried out in accordance with ISO 148-2 and with the additional requirements of 5.1.
Indirect verification shall be carried out using certified reference test piece. The repeatability and the bias shall be as specified in Table 3.
AIl equipment used for inspection and verification of a reference testing machine shall be calibrated and shall have a certified traceability to the SI System (the international system of units). The body performing the verification shall maintain calibration records for all inspection, measurement and test equipment.
The dates and details of all inspections and repairs shall be documented and maintained for each reference machine by the owner of the machine.ISO 148-3 pdf download.
