Files in this item



application/pdfSRS-611.pdf (3MB)
Structural Research Series 611PDF


Title:A Transferability Model for Brittle Fracture Including Constraint and Ductile Tearing Effects: A Probabilistic Approach
Author(s):Ruggieri, C.; Dodds, Robert H., Jr.
Subject(s):Weibull stress
Cleavage fracture
Finite elements
Abstract:This study describes a computational framework to quantify the influence of constraint loss and ductile tearing on the cleavage fracture process, as reflected by the pronounced effects on macroscopic toughness (Jc, Dc). Our approach adopts the Weibull stress, Ow, as a suitable near-tip parameter to describe the coupling of remote loading with a micromechanics model incorporating the statistics of microcracks (weakest link philosophy). Unstable crack propagation (cleavage) occurs at a critical value of Ow which may be attained prior to, or following, some amount of stable, ductile crack extension. A central feature of our framework focuses on the realistic numerical modeling of ductile crack growth using the computational cell methodology to define the evolution of near-tip stress fields during crack extension. Under increased remote loading (J), development of the Weibull stress reflects the potentially strong variations of near-tip stress fields due to the interacting effects of constraint loss and ductile crack extension. Computational results are discussed for well-contained plasticity, where the near-tip fields for a stationary and a growing crack are generated with a modified boundary layer (MBL) formulation (in the form of different levels of applied T-stress). These analyses demonstrate clearly the dependence of Ow on crack-tip stress triaxiality and crack growth. The paper concludes with an application of the micromechanics model to predict the measured geometry and ductile tearing effects on the cleavage fracture toughness, J c, of an HSLA steel. Here, we employ the concept of the Dodds-Anderson scaling model, but.replace their original local criterion based on the equivalence of near-tip stressed volumes by attainment of a critical value of the Weibull stress. For this application, the proposed approach successfully predicts the combined effects of loss of constraint and crack growth on measured Jc-values.
Issue Date:1996-08
Publisher:University of Illinois Engineering Experiment Station. College of Engineering. University of Illinois at Urbana-Champaign.
Series/Report:Civil Engineering Studies SRS-611
Genre:Technical Report
Sponsor:U.S. Nuclear Regulatory Commission. Office of Nuclear Regulatory Research. Division of Engineering.
NASA-AMES Research Center
Contract Nos. N61533-92-K-0030 and NCC2-5022
Date Available in IDEALS:2009-11-16

This item appears in the following Collection(s)

Item Statistics