IEC 60793-1-31:2019 provides values of the tensile strength under dynamic loading of optical fibre samples. The method tests individual lengths of uncabled and unbundled glass optical fibre. Sections of fibre are broken with controlled increasing stress or strain that is uniform over the entire fibre length and cross section. The stress or strain is increased at a nominally constant rate until breakage occurs. The distribution of the tensile strength values of a given fibre strongly depends on the sample length, loading velocity and environmental conditions. The test can be used for inspection where statistical data on fibre strength is required. Results are reported by means of statistical quality control distribution. Normally, the test is carried out after temperature and humidity conditioning of the sample. However, in some cases, it can be sufficient to measure the values at ambient temperature and humidity conditions. This method is applicable to categories A1, A2, and A3, and classes B and C optical fibres. The object of this document is to establish uniform requirements for the mechanical characteristic: tensile strength. This third edition cancels and replaces the second edition published in 2010. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition: a) correction of Formulae (3b) and (4b) and renumbering of formulae. Keywords: tensile strength under dynamic loading of optical fibre samples<\/p>\n
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| 36<\/td>\n | undefined <\/td>\n<\/tr>\n | ||||||
| 39<\/td>\n | Annex ZA(normative)Normative references to international publicationswith their corresponding European publications <\/td>\n<\/tr>\n | ||||||
| 41<\/td>\n | English CONTENTS <\/td>\n<\/tr>\n | ||||||
| 43<\/td>\n | FOREWORD <\/td>\n<\/tr>\n | ||||||
| 45<\/td>\n | INTRODUCTION <\/td>\n<\/tr>\n | ||||||
| 46<\/td>\n | 1 Scope 2 Normative references 3 Terms and definitions 4 Hazards <\/td>\n<\/tr>\n | ||||||
| 47<\/td>\n | 5 Apparatus 5.1 General 5.2 Gripping the fibre at both ends 5.3 Sample support 5.4 Stretching the fibre <\/td>\n<\/tr>\n | ||||||
| 48<\/td>\n | 5.5 Measuring the force at failure 5.6 Environmental control equipment <\/td>\n<\/tr>\n | ||||||
| 49<\/td>\n | 6 Sample preparation 6.1 Definition 6.2 Sample size and gauge length Figures Figure 1 \u2013 Bimodal tensile strength Weibull plot for a 20 m gauge length test set-up at 5 %\/min strain rate <\/td>\n<\/tr>\n | ||||||
| 50<\/td>\n | 6.3 Auxiliary measurements 6.4 Environment 7 Procedure 7.1 Preliminary steps 7.2 Procedure for a single specimen <\/td>\n<\/tr>\n | ||||||
| 51<\/td>\n | 7.3 Procedure for completing all samples for a given nominal strain rate 8 Calculations 8.1 Conversion of tensile load to failure stress <\/td>\n<\/tr>\n | ||||||
| 52<\/td>\n | 8.2 Preparation of a Weibull plot 8.3 Computation of Weibull parameters <\/td>\n<\/tr>\n | ||||||
| 53<\/td>\n | 9 Results 9.1 Details to be reported <\/td>\n<\/tr>\n | ||||||
| 54<\/td>\n | 9.2 Details to be recorded 10 Specification information <\/td>\n<\/tr>\n | ||||||
| 55<\/td>\n | Annex A (informative)Typical testing apparatus of tensile strength under dynamic loading Figure A.1 \u2013 Capstan design Figure A.2 \u2013 Translation test apparatus <\/td>\n<\/tr>\n | ||||||
| 56<\/td>\n | Figure A.3 \u2013 Rotating capstan apparatus Figure A.4 \u2013 Rotating capstan apparatus for long lengths Figure A.5 \u2013 Ganged rotating capstan tester <\/td>\n<\/tr>\n | ||||||
| 57<\/td>\n | Annex B (informative)Guidelines on gripping the fibre Figure B.1 \u2013 Gradual slippage Figure B.2 \u2013 Irregular slippage <\/td>\n<\/tr>\n | ||||||
| 58<\/td>\n | Figure B.3 \u2013 Sawtooth slippage Figure B.4 \u2013 Acceptable transfer function <\/td>\n<\/tr>\n | ||||||
| 59<\/td>\n | Figure B.5 \u2013 Typical capstan Figure B.6 \u2013 Isostatic compression <\/td>\n<\/tr>\n | ||||||
| 60<\/td>\n | Figure B.7 \u2013 Escargot wrap <\/td>\n<\/tr>\n | ||||||
| 61<\/td>\n | Annex C (informative)Guidelines on stress rate Figure C.1 \u2013 System to control stress rate <\/td>\n<\/tr>\n | ||||||
| 62<\/td>\n | Figure C.2 \u2013 Time variation of load and loading speed <\/td>\n<\/tr>\n | ||||||
| 63<\/td>\n | Bibliography <\/td>\n<\/tr>\n<\/table>\n","protected":false},"excerpt":{"rendered":" Tracked Changes. Optical fibres – Measurement methods and test procedures. Tensile strength<\/b><\/p>\n |