INTERNATIONAL STANDARD
Metallicmaterials-Charpy pendulumimpacttest-
Verificationoftestingmachines Part 2:
Materiaux metallques - Essai de flexion par choc sur eprouvettePartie 2: Verification des machines d’essai (mouton-pendule)
Charpy
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Contents
Page
Definitions pertaining to the machine.3.1 3.2 Definitions pertaining to energy. 23.3 Definitions pertaining to test pieces. 4
Direct verification.6.1 General. 66.2 9 Foundation/installation. Machine framework. 6 76.4 6.5 Anvil and supports. Pendulum. 11 .86.6 Indicating equipment. 12
Indirect verification by use of reference test pieces 13
Reference test pieces used.7.1 7.2 Absorbed energy levels. 13 137.3 7.4 Requirements for reference test pieces. Limited direct verification. 13 137.5 Bias and repeatability. Repeatability 137.5.2 7.5.1 Bias. 13 14
9.2 9.1 General. Direct verification. 14 156 Indirect verification.. 15
Annex A (informative) Measurement uncertainty of the result of the indirect verification ofa Charpy pendulum impact machine. 21
Annex B (informative) Measurement uncertainty of the results of the direct verification ofa Charpy pendulum impact testing machine.
Foreword
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SC 4 Toughness testing - Fracture (F) Pendulum (P) Tear (T). The mittee responsible for this document is ISO/TC 164 Mechanical testing of metals Submittee
This third edition cancels and replaces the second edition (ISO 148-2:2008) which has been technicallyrevised.
ISO 148 consists of the following parts under the general title Metallic materials - Charpy pendulumimpact test:
-Part 1: Test method
--Part 2: Verification of testing machines
-Part 3: Preparation and characterization of Charpy V-notch test pieces for indirect verification ofpendulum impact machines
Introduction
The suitability of a pendulum impact testing machine for acceptance testing of metallic materials hasusually been based on a calibration ofits scale and verification of pliance with specified dimensions such as the shape and spacing of the anvils supporting the specimen. The scale calibration is monly verified by measuring the mass of the pendulum and its elevation at various scale readings. Thisprocedure for 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 traceablemeasurements minimized the necessity for arbitration regarding the suitability of the machines formaterial acceptance tests.
However sometimes two machines that had been evaluated by the direct-verification procedures described above and which met alldimensional requirements were found to give significantly differentimpact values when testing test pieces of the same material.
This difference was mercially important when values obtained using one machine met the materialsome purchasers of materials added the requirement that all pendulum impact testing machines used specification while the values obtained using the other machine did not. To avoid such disagreements for acceptance testing of material sold to them are to be indirectly verified by testing reference test pieces supplied by them. A machine was considered acceptable only if the values obtained using themachine agreed within specified limits with the value furnished with the reference test pieces.
This part of ISO 148 describes both the original direct verification and the indirect verificationprocedures.
