IEC 60793-1-33:2001 pdf download

IEC 60793-1-33:2001 pdf download.Optical fibres – Part 1-33: Measurement methods and test procedures – Stress corrosion susceptibility.
3 Apparatus
See annexes A. B, C, D. and E for each of the layout drawings and other equipment
requirements for each of the methods respectively.
4 Sampling and specimens
These measurements are statistical In nature. A number of specimens or samples from a common population are tested, each under several conditions.
Failure stress or time statistics for various sampling groups ore used to calculate the stress corrosion susceptibility parameters
4.1 SpecImen length
Specimen length is contingent on the test procedure used. See the respective annexes A. B, C, D and E for the length required for the test method For tensile tests, the length ranges from 0.5 m to at most 5 m. For two-point bending tests, the actual length tested is less than 1 cm and for uniform bending tests about 1 m.
4.2 Specimen preparation and conditioning
All of the test methods shall be performed under constant environmental conditions. Unless
otherwise specified In the detail specification, the nominal temperature shall be In the range of 20 C to 23 °C with a tolerance of ±2 C for the duration of the test. Unless otherwise
specified in the detail specification, the nominal relative humidity (RH) shall be in the range of 40 % to 60 % with a tolerance of ±5 % for the duration of the test.
Unless otherwise specified, all specimens shall be pre-conditioned in the test environment for a minimum period of 12 h.
The use of stress corrosion susceptibility (and proof stress) parameters for reliability estimates Is still under consideration. A method for extrapolating such parameters to service environments different from the default environment specified above has not been developed.
It has been observed that the value of n produced by these tests can change after even brief exposure of the fibre to elevated temperature and humidity, A guide for the use of these methods is documented In IEC 62048.
The observed value of stress corrosion susceptibility parameter, n, may differ between fatigue test methods. Influences on the results have been observed concerning the measuring time and the applied stress level. Care should be taken in the choice of test method. This should be agreed between the user and manufacturer.
5 Reference test method
Method A is the reference test method and shall be used to resolve disputes becau5e ii yields minimal values compared to the others and may be completed in a duration practical for dispute resolution.
6 Procedure
See annexes A, B, C, D and E. respectively. for the individual test methods.
Each of several samples (consisting of a number of specimens) is exposed to one of a number of stress conditions. For static fatigue tests, a constant stress is applied from sample to sample and time to failure is measured. For dynamic fatigue tests, the stress rate is varied from sample to sample and the failure stress is measured.
The following is an overview of the procedures common to all methods:
— complete pre-conditioning;
— divide the specimens into sample groups;
— apply the specified stress conditions to each sample group;
— measure time or stress at failure;
— complete calculations
7 CalculatIons
The calculations for each individual test method are found respectively in annexes A, B. C, D
and E.
8 Results
8.1 The following information shall be reported with each test:
— fibre identification;
– test date;
— stress corrosion susceptibility parameter:
— test method.
8.2 The following information shall be provided upon request:
— specific information as required by the test method;
— any special pre-conditioning.
Clauses A.5. B.5. C.5. D.5, and E.5 have results that apply respectively for each specific method.
9 Specification information
The detail specification shall specify the following information:
— information to be reported;
— any deviations to the procedure that apply;
— failure or acceptance criteria.