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Metallurgical Transactions A

, Volume 14, Issue 11, pp 2277–2287 | Cite as

A local criterion for cleavage fracture of a nuclear pressure vessel steel

  • F. M. Beremin
  • Andre Pineau
  • Francois Mudry
  • Jean-Claude Devaux
  • Yannick D’Escatha
  • Patrick Ledermann
Mechanical Behavior

Abstract

Experiments were performed on three heats of A508 class 3 steel in order to determine the mechanical conditions for cleavage fracture. These tests were carried out on various geometries including 4-point bend specimens and axisymmetric notched tensile bars with different notch radii which have been modelized using the finite element method. In one heat, the temperature range investigated was from 77 K to 233 K. It is shown that the cleavage resistance is increased by tensile straining. Moreover, the probability of fracture obeys the Weibull statistical distribution. All the results can be accounted for in terms of a local criterion based on Weibull theory and which takes into account the effect of plastic strain. In this criterion, the parameters which were experimentally determined are found to be temperature independent over the range 77 K to 170 K. The applicability of the approach proposed for cleavage fracture at the crack tip is also examined. It is shown that the experimental results published in the literature giving the variation of fracture toughness with temperature can be explained by the proposed criterion which predicts reasonably well both the scatter in the experimental results and theK ICtemperature dependence.

Keywords

Metallurgical Transaction Cleavage Fracture Maximum Principal Stress Local Criterion Bend Specimen 
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Copyright information

© The Metallurgical of Society of AIME 1983

Authors and Affiliations

  • F. M. Beremin
    • 1
  • Andre Pineau
    • 1
  • Francois Mudry
    • 1
  • Jean-Claude Devaux
    • 2
  • Yannick D’Escatha
    • 3
  • Patrick Ledermann
    • 3
  1. 1.Centre des Matériaux de l’Ecole des Mines de ParisFrance
  2. 2.Centre de calcul de la division des fabrications de FramatomeSaint-MarcelFrance
  3. 3.Bureau de Contrôle de la Construction NucléaireDijonFrance

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