Production of CHARPY V certified reference specimens (MRC)

The Charpy test offers a mechanical means for determining the resistance of a specimen to shocks or the notching effect. The resilience test consists of breaking notched bars on an impact strength tester and then measuring the resulting breaking energy. To ensure the precision of their equipment, industry owners must verify their raw materials with certified impact bending machines using Charpy reference specimens designed by LNE.

Services proposed

Production of Charpy specimens:
To develop a Charpy reference specimen, several parameters are considered, including: choice of raw material, machining, homogeneity, and stability.

Manufactured by batch and characterized by means of sampling, the line of specimens proposed by LNE covers a spectrum extending from 25 to 220 Joules, broken down into 5 energy levels. For a given material, these different energy levels are obtained by applying heat treatment:

  • Low energy: 25 Joules to 30 Joules,
  • Medium energy: 70 Joules to 80 Joules,
  • High energy: 115 Joules to 125 Joules,
  • High energy: 150 Joules to 170 Joules,
  • Super high energy: 200 Joules to 220 Joules.

Specimen homogeneity is optimized with a standard deviation of less than 3% (vs. 5% required according to Standard ISO 148).

The specimens are delivered in batches of 5, along with a COFRAC reference material certificate.

Accreditation details

Services performed are backed by COFRAC accreditation NF EN ISO 148, Part 3 (2-mm knife).