Modelling of size and shape of damage zone in quasi-brittle notched specimens – analytical approach based on fracture-mechanical evaluation of loading curves

An analysis focused on capturing the phenomenon of quasibrittle fracture is presented. Selected parameters relevant for quasi-brittle fracture are evaluated and an assessment of their dependence on the size and shape of the test specimen is studied. Determination of these fracture characteristics is...

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Main Authors: J. Klon, V. Veselý
Format: Article
Language:English
Published: Gruppo Italiano Frattura 2016-12-01
Series:Fracture and Structural Integrity
Subjects:
Online Access:https://www.fracturae.com/index.php/fis/article/view/1816
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author J. Klon
V. Veselý
author_facet J. Klon
V. Veselý
author_sort J. Klon
collection DOAJ
description An analysis focused on capturing the phenomenon of quasibrittle fracture is presented. Selected parameters relevant for quasi-brittle fracture are evaluated and an assessment of their dependence on the size and shape of the test specimen is studied. Determination of these fracture characteristics is based on the records of the fracture tests on notched specimens, particularly from recorded loading diagrams. A method of separation of the energy amounts released for the propagation of the (effective) crack and that dissipated within the volume of a large nonlinear zone at the crack tip – the fracture process zone – is introduced and tested on selected data from experimental campaigns published in the literature. The work is accompanied with own conducted numerical simulations using commercial finite element code with implemented cohesive crack model. Results from three-point bending tests on specimens of different sizes and relative notch lengths are taken into account in this study. The proposed model has only two parameters whose values are constant for all specimen sizes and notch lengths.
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spelling doaj-art-529a81a035cf41a899d54d4a1018948c2025-01-02T23:01:28ZengGruppo Italiano FratturaFracture and Structural Integrity1971-89932016-12-011139Modelling of size and shape of damage zone in quasi-brittle notched specimens – analytical approach based on fracture-mechanical evaluation of loading curvesJ. KlonV. VeselýAn analysis focused on capturing the phenomenon of quasibrittle fracture is presented. Selected parameters relevant for quasi-brittle fracture are evaluated and an assessment of their dependence on the size and shape of the test specimen is studied. Determination of these fracture characteristics is based on the records of the fracture tests on notched specimens, particularly from recorded loading diagrams. A method of separation of the energy amounts released for the propagation of the (effective) crack and that dissipated within the volume of a large nonlinear zone at the crack tip – the fracture process zone – is introduced and tested on selected data from experimental campaigns published in the literature. The work is accompanied with own conducted numerical simulations using commercial finite element code with implemented cohesive crack model. Results from three-point bending tests on specimens of different sizes and relative notch lengths are taken into account in this study. The proposed model has only two parameters whose values are constant for all specimen sizes and notch lengths.https://www.fracturae.com/index.php/fis/article/view/1816Quasi-brittle FractureLoading CurveWork of FractureResistance CurveEffective CrackFracture Process Zone
spellingShingle J. Klon
V. Veselý
Modelling of size and shape of damage zone in quasi-brittle notched specimens – analytical approach based on fracture-mechanical evaluation of loading curves
Fracture and Structural Integrity
Quasi-brittle Fracture
Loading Curve
Work of Fracture
Resistance Curve
Effective Crack
Fracture Process Zone
title Modelling of size and shape of damage zone in quasi-brittle notched specimens – analytical approach based on fracture-mechanical evaluation of loading curves
title_full Modelling of size and shape of damage zone in quasi-brittle notched specimens – analytical approach based on fracture-mechanical evaluation of loading curves
title_fullStr Modelling of size and shape of damage zone in quasi-brittle notched specimens – analytical approach based on fracture-mechanical evaluation of loading curves
title_full_unstemmed Modelling of size and shape of damage zone in quasi-brittle notched specimens – analytical approach based on fracture-mechanical evaluation of loading curves
title_short Modelling of size and shape of damage zone in quasi-brittle notched specimens – analytical approach based on fracture-mechanical evaluation of loading curves
title_sort modelling of size and shape of damage zone in quasi brittle notched specimens analytical approach based on fracture mechanical evaluation of loading curves
topic Quasi-brittle Fracture
Loading Curve
Work of Fracture
Resistance Curve
Effective Crack
Fracture Process Zone
url https://www.fracturae.com/index.php/fis/article/view/1816
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AT vvesely modellingofsizeandshapeofdamagezoneinquasibrittlenotchedspecimensanalyticalapproachbasedonfracturemechanicalevaluationofloadingcurves