Charpy impact pendulum test at ambient temperature (low energy)

Presentation for participants

 
Reference of the ILC: CY-X-LE
   
References of test methods: ISO 148-1                    
   
Frequency: For this ILC, there is a risk that the number of registrations is insufficient. So a pre-registration procedure is put in place, as follows:
  1 - Participants interested in participating pre-register using the registration form. No invoicing is made for this pre-registration;
2 - When at least 10 potential participants have pre-registered, CompaLab asks each of these pre-registrees to confirm their willingness to participate and what are the characteristics for which they commit to provide results;
3 - If at least 8 participants confirm their intention to participate, the CIL organisation concerned is engaged.
   
   
Main characteristics: KV2 (Absorbed energy), LE (Lateral expansion)
   
Other characteristics: KV8, KU2, KU8 (Absorbed energie), SFA (Fracture appearance)
  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: For numerical results, the statistical computation will provide an assigned value with its attached uncertainty, values of standard deviations for repeatability and reproductibility, limits of alerts for bias and repeatability of the participant, indiviual values for uncertainty of results of participants.
Number of products submitted to tests: 1
Number of samples per participation: 3
Max number of operators per participation: 1 (it is necessary to order as many participations as there are participating test operators)
Product submitted to tests: Non alloyed steel
Type of samples: Parrallelepipeds
Approximate dimensions of samples: 120x15x15 mm
Specific preparation to be performed by the participant:  Machining of test specimens (2 test pieces per supplied sample)
                   
Special notice for this ILC: Target energy range: 5-30 J. The participating laboratory determines the energy values (KU2, or KU8, or KV2, or KV8) which it wishes among the proposed ones. The participant must choose only one type of energy U2, U8, V2 or V8 as described on the reference standard, according to its habits, and apply it in the same way one each of the samples it receives.
A participant who would wish to determine several types of absorbed energy must register as many participations as the number of types of energy it wishes to determine.
The results of the participants who did not fulfil this requirement will not be taken into account in the data processing (because the number of values for each type of values is then not large enough).