ISO 148-2 2016 金属材料 夏比摆锤冲击试验 第2部分 测试机器的验证(英文版).pdf

148,2016,ISO,夏比,摆锤,国外及港澳台标准
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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

COPYRIGHTPROTECTEDDOCUMENT

@ ISO 2016 Published in Switzerland

Allrights reserved. Unles otherwise speciied no part of this publiction may be reproduced or utilized otherwise n any formor by any means electronic or mechanical including photocopying or posting on the internet or an intranet without prior written permission. Permission can be requested from either ISO at the address below or ISO's member body in the country ofthe requester.

ISO copyright officeCh. de Blandonnet 8 ▪ CP 401 CH-1214 Vernier Geneva SwitzerlandFax 41 22 749 09 47 Tel. 41 22 749 01 11copyright@

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

bodies (ISO member bodies). The work of preparing International Standards is normally carried outthrough ISO technical mittees. Each member body interested in a subject for which a technical mittee has been established has the right to be represented on that mittee. InternationalISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of organizations governmental and non-governmental in liaison with ISo also take part in the work.electrotechnical standardization.

The procedures used to develop this document and those intended for its further maintenance aredescribed in the ISO/IEC Directives Part 1. In particular the different approval criteria needed for the different types of ISo documents should be noted. This document was drafted in accordance with theeditorial rules of the ISO/IEC Directives Part 2 (see

Attention is drawn to the possibility that some of the elements of this document may be the subject ofpatent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of any patent rights identified during the development of the document will be in the Introduction and/oron the ISo list of patent declarations received (see

Any trade name used in this document is information given for the convenience of users and does not constitute an endorsement.

For an explanation on the meaning of ISO specific terms and expressions related to conformity assessment as well as information about ISO's adherence to the World Trade Organization (WTO) principles in theTechnical Barriers to Trade (TBT) see the following URL:

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.

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