4.7 Article

An enhanced probabilistic model for cleavage fracture assessment accounting for local constraint effects

Journal

ENGINEERING FRACTURE MECHANICS
Volume 77, Issue 18, Pages 3573-3591

Publisher

PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.engfracmech.2010.08.001

Keywords

Cleavage fracture; Ferritic material; Probabilistic model; Local approach; Transferability

Categories

Funding

  1. German Federal Department of Economics and Technology (BMWi) [1501320]

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Objective of the present study is the development of an enhanced model for the probabilistic cleavage fracture assessment of ferritic materials considering the conditions for both nucleation and propagation of micro defects In a first step the local load and deformation history at the cleavage initiation spot is analysed numerically for a variety of fracture mechanics specimens The experimental data base Includes experiments on standard deep and shallow crack specimens with different geometries as well as novel small scale cruciform bending specimens These specimens enable the application of an additional stress component along the crack front Based on the results a two-criteria concept for cleavage initiation is proposed assuming that the propagation of existing micro defects is controlled by the maximum principal stress whereas the nucleation of potentially critical micro defects is governed by a combination of the local plastic strain and the local stress triaxiality at the respective material point Based on these assumption a probabilistic cleavage fracture model is formulated and validated against the experimental data base (C) 2010 Elsevier Ltd All rights reserved

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