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Axial fatigue test on steel


Axial fatigue test on steel
Presentation for participants
Reference of the ILC: FA18MP
References of test methods: ISO 1099
Frequency: Each 3 years
Main characteristics N (Number of cycles before failure for a given σmax and a given Δσ)
Other characteristics -
Caution: The number of determinations may be low for the secundary characteristics, what may make inefficient the comparison between laboratories
Determination of the assigned values (“true values” for each characteristic):
By statistical computation of the totality of the results with possible selection on competence criteria (accreditation, validation by a reference body, quantity of tests performed in the year), test to detect possible collusion, merging of results not obtained in reproductibility conditions, suppression of technically unvalid results.
Type of statistical computation:
Results are numerical. For each characteristic selected by the participant, 1 result shall be provided for each sample. The statistical computation will provide an assigned value with its attached uncertainty, values of standard deviations for repeatability, for reproductibility, limits of alerts for bias and repeatability of the participant, indiviual values for uncertainty of results of participants.
Number of samples per participant: 9
Product submitted to tests: Non alloyed steel
Type of samples: Bars
Approximate dimensions of samples: ± Ø20x480 mm
Specific preparation to be performed by the participant:  Machining of test specimens
Special notice for this ILC: Results have to be numerical in order to be statistically handable. The number of samples is set up at 9, in order to make the estimation of standard deviation of results statistically relevant. So, to avoid tests to last too long and avoid costs of tests too high:
1. loading values will be severe but, however, will remain reasonably close to usual conditions;
2. a special statistical procedure is used so that tests on samples showing the longest life may be stopped before rupture, saving an important amount of testing time.