Criterion of cleavage crack propagation and arrest in a nuclear PWR vessel steel
type: Dataset
description: The purpose of this PhD thesis is to understand physical mechanisms of cleavage crack propagation and arrest in the 16MND5 PWR vessel steel and to propose a robust predicting model based on a brittle fracture experimental campaign of finely instrumented laboratory specimens associated with numerical computations. First, experiments were carried out on thin CT25 specimens at five temperatures (-150°C, -125°C, - 100°C, -75°C, -50°C). Two kinds of crack path, straight or branching path, have been observed. To characterize crack propagation and to measure crack speed, a high-speed framing camera system was used, combined with the development of an experimental protocol which allowed to observe CT surface without icing inside the thermal chamber and on the specimen. The framing camera (520 000 fps) has allowed to have a very accurate estimation of crack speed on the complete ligament of CT (~ 25 mm). Besides, to analyse experiments and to study the impact of viscosity on the mechanical response around the crack tip, the elastic-viscoplastic behavior of the ferritic steel has been studied up to a strain rate of 104 s-1 for the tested temperatures.The eXtended Finite Element Method (X-FEM) was used in CAST3M FE software to model crack propagation. Numerical computations combine a local non linear dynamic approach with a RKR type fracture stress criterion to a characteristic distance. The work carried out has confirmed the form of the criterion proposed by Prabel at -125°C, and has identified the dependencies of the criterion on temperature and strain rate. From numerical analyzes in 2D and 3D, a multi-temperature fracture stress criterion, increasing function of the strain rate, was proposed. Predictive modeling were used to confirm the identified criterion on two specimen geometries (CT and compressive ring) in mode I at different temperatures. SEM observations and 3D analyzes made with optical microscope showed that the fracture mechanism was the cleavage associated with…
landing page: https://theses.hal.science/tel-00927524
identifier: NNT: 2013ECAP0002
keyword: arret-de-fissure
keyword: cleavage
keyword: clivage
keyword: crack-arrest
keyword: infoeu-reposemanticsdoctoralthesis
keyword: spiotherengineering-sciences-physicsother
keyword: tenacite
keyword: theses
keyword: toughness
issued: 2026-05-07T12:25:52.115157
modified: 2026-05-07T12:25:52.115161
language: fr
contact point: Organization
  fn: CCSD

test_moissonnage_selune
type: Agent

Criterion of cleavage crack propagation and arrest in a nuclear PWR vessel steel
type: Distribution
format: HTML
access URL: https://theses.hal.science/tel-00927524
issued: 2026-05-07T12:25:52.121077
modified: 2026-05-07T12:25:52.104178