ISO/TR TECHNICAL REPORT 16194 First edition 2017-04 Pneumatic fluid power Assessment of component reliability by accelerated life testing General guidelines and procedures Transmissions pneumatiques - Evaluation de la fiabilite du composant par essai de durée de vie accélérée - Lignes directrices générales et modes opératoires Reference number ISO/TR16194:2017(E) International Organization for Standardization @ IS0 2017 ee=ZHEJIANG INST OF STANDARDIZATION C1 5956617 mitted without license from IHS IS0/TR 16194:2017(E) COPYRIGHT PROTECTED DOCUMENT @ IS0 2017, Published in Switzerland All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form written permission. Permission can be requested from either Iso at the address below or Iso's member body in the country of the requester. ISO copyrightoffice Ch. de Blandonnet 8 . CP 401 CH-1214 Vernier, Geneva, Switzerland Tel. +41 22 749 01 11 Fax +41 22 749 09 47 [email protected] www.iso.org Licensee-ZHEJIANG INST OF STANDARDIZoISQ37 -All rights reserved HS und Not for Resale, 2017/8/21 00:58:07 No reproduction or networking permited without license from IHS IS0/TR 16194:2017(E) Contents Page Foreword ..iv Introduction. ..V 1 Scope. ..1 2 Normative references ..1 3 Terms and definitions 4 Symbols and units ..3 5 .3 Concepts of reliability and accelerated life testing. 6 Failure mechanism and mode 7 Strategy of conducting accelerated life testing .4 8 Design of accelerated life testing. .5 8.1 Normal use conditions. .5 8.2 Preliminary tests. .5 8.3 Levels of accelerated stress.. .6 8.4 Sample size. .7 8.5 Data observation and measurement 1 8.6 Types of stress loading .7 9 End of test .8 9.1 Minimum number of failures required .8 9.2 Termination cycle count. .8 9.3 Suspended or censored test units ..8 10 Statistical analysis .9 10.1 Analysis of failure data. .9 10.2 Life distribution. ..9 10.3 Accelerated life testing model 10 10.4 Data analysis and parameter estimation. 10 11 Reliability characteristics from the test data ..11 12 Test report ..12 Annex A (informative) Determining stress levels when stress is time-dependent ..13 Annex B (informative) Life-stress relationship models ..17 Annex C (informative) Verification of compromise Weibull slopes ..26 Annex D (informative) Calculation procedures for censored data ..32 Annex E (informative) Examples of using accelerated life testing in industrial applications ..35 Annex F (informative) Palmgren-Miner's rule ..37 Annex G (informative) ALT experimentai resuits for pneumatic cylinder ...39 Bibliography. ..59 ii nSee=ZHEJIANG INST OF STANDARDIZATION C1 5956617 without license from IHS Not for Resale, 2017/8/21 00:58:07