INTERNATIONAL STANDARD
Metallicmaterials-Charpy pendulumimpacttest-
Part 3: Preparation andcharacterizationof verificationofpendulumimpact CharpyV-notchtestpiecesforindirect machines
Materiaux metalliques - Essai de flexion par choc sur eprouvetteCharpy
Partie 3: Preparation et caracterisation des eprouvettes Charpyα entaille en V pour la verification indirecte des machines d'essaimouton-pendule
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Contents
Page
Foreword. ivIntroduction. .V1 Scope. 12 Normative references. 13 Terms and definitions. Definitions pertaining to the machine. 13.1 3.2 Definitions pertaining to energy 1 23.3 3.4 Definitions pertaining to test pieces. Definitions related to groups of test pieces. 2 24 Symbols and abbreviated terms.. 35 Reference testing machine. 45.1 Characteristics. 5.1.1 General. 4 45.1.2 5.1.3 Geometrical characteristics (see Table 2 and Figures 1 and 2) Capacity 55.1.4 Hardness. 5 55.1.5 5.1.6 Energy-indicating mechanism. Vibration. 6 65.2 Verification of reference testingmachine. 6Reference test pieces. 6.1 General. 6 66.2 Material. 66.3 6.4 Marking- Dimensions. 7 76.5 6.6 Reference test piece sets.. Qualification of a batch of reference test pieces. 7Certificatesforreference test pieces. 8 88 Notes for using sets of reference test pieces. .8Annex A (informative) Uncertainty of the certified KV value of Charpy reference materials.Bibliography 18
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 Mechonicol testing of metals Submittee
This third edition cancels and replaces the second edition (1ISO 148-3:2008) 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
penduium impact machines
Introduction
The suitability of a pendulum impact testing machine for acceptance testing of metallic materials hasusually been based on a calibration of its scale and verification of pliance with specified dimensions 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 all dimensional 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 should 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.
Other standards and codes also require indirect verification using reference test pieces; for example this part of ISO148is to specify therequirements preparation andmethods forqualifying test pieces EN 10045-2[11 (now obsolete) and ASTM E23{2] require the use of reference test pieces. The purpose ofused for the indirect verification of pendulum impact testing machines.
