A computational method for crack growth in glulam under variable humidity

Antonio Lorenzo Mendicino, Stefania Fortino, Maximilian Henning, Gerhard Dill-Langer

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientific

Abstract

This paper presents a three-dimensional orthotropic-viscoelastic model for the analysis of cracked glulam structures under short-term loading or sustained loads. Both conditions of constant and variable humidity are analyzed. Kelvin-type elemental deformations are used for describing the viscoelastic creep and the whole constitutive model is implemented into the Umat user subroutine of Abaqus FEM code. The crack growth simulation under short-term loading is done by using a suitable exponential damage law and the cohesive elements of Abaqus in the fracture process zone. The proposed computational approach is validated by analyzing glued laminated (glulam) specimens under opening mode and the numerical load-displacement curves are compared with both literature results and experimental data obtained in the context of the present research. For long-term fracture tests under sustained loads and constant moisture content, a criterion of crack initiation based on a viscoelastic integral parameter is also introduced. Both the proposed constitutive model and the computational approach can be further extended to cases of crack propagation in the presence of variable humidity conditions.
Original languageEnglish
Title of host publicationWCTE 2010, World Conference on Timber Engineering
Subtitle of host publicationConference Proceedings
Place of PublicationTrento, Italy
Number of pages9
Publication statusPublished - 2010
MoE publication typeNot Eligible
Event11th World Conference on Timber Engineering, WCTE 2010 - Riva del Garda, Italy
Duration: 20 Jun 201024 Jun 2010
Conference number: 11

Conference

Conference11th World Conference on Timber Engineering, WCTE 2010
Abbreviated titleWCTE 2010
CountryItaly
CityRiva del Garda
Period20/06/1024/06/10

Fingerprint

Computational methods
Constitutive models
Crack propagation
Atmospheric humidity
Subroutines
Crack initiation
Creep
Moisture
Finite element method

Keywords

  • Mode I and Mode II crack growth
  • glulam
  • cohesive elements
  • moisture-stress analysis
  • J integral
  • FEM
  • Abaqus

Cite this

Mendicino, A. L., Fortino, S., Henning, M., & Dill-Langer, G. (2010). A computational method for crack growth in glulam under variable humidity. In WCTE 2010, World Conference on Timber Engineering: Conference Proceedings Trento, Italy.
Mendicino, Antonio Lorenzo ; Fortino, Stefania ; Henning, Maximilian ; Dill-Langer, Gerhard. / A computational method for crack growth in glulam under variable humidity. WCTE 2010, World Conference on Timber Engineering: Conference Proceedings. Trento, Italy, 2010.
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abstract = "This paper presents a three-dimensional orthotropic-viscoelastic model for the analysis of cracked glulam structures under short-term loading or sustained loads. Both conditions of constant and variable humidity are analyzed. Kelvin-type elemental deformations are used for describing the viscoelastic creep and the whole constitutive model is implemented into the Umat user subroutine of Abaqus FEM code. The crack growth simulation under short-term loading is done by using a suitable exponential damage law and the cohesive elements of Abaqus in the fracture process zone. The proposed computational approach is validated by analyzing glued laminated (glulam) specimens under opening mode and the numerical load-displacement curves are compared with both literature results and experimental data obtained in the context of the present research. For long-term fracture tests under sustained loads and constant moisture content, a criterion of crack initiation based on a viscoelastic integral parameter is also introduced. Both the proposed constitutive model and the computational approach can be further extended to cases of crack propagation in the presence of variable humidity conditions.",
keywords = "Mode I and Mode II crack growth, glulam, cohesive elements, moisture-stress analysis, J integral, FEM, Abaqus",
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Mendicino, AL, Fortino, S, Henning, M & Dill-Langer, G 2010, A computational method for crack growth in glulam under variable humidity. in WCTE 2010, World Conference on Timber Engineering: Conference Proceedings. Trento, Italy, 11th World Conference on Timber Engineering, WCTE 2010, Riva del Garda, Italy, 20/06/10.

A computational method for crack growth in glulam under variable humidity. / Mendicino, Antonio Lorenzo; Fortino, Stefania; Henning, Maximilian; Dill-Langer, Gerhard.

WCTE 2010, World Conference on Timber Engineering: Conference Proceedings. Trento, Italy, 2010.

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientific

TY - GEN

T1 - A computational method for crack growth in glulam under variable humidity

AU - Mendicino, Antonio Lorenzo

AU - Fortino, Stefania

AU - Henning, Maximilian

AU - Dill-Langer, Gerhard

N1 - Project code: 17546

PY - 2010

Y1 - 2010

N2 - This paper presents a three-dimensional orthotropic-viscoelastic model for the analysis of cracked glulam structures under short-term loading or sustained loads. Both conditions of constant and variable humidity are analyzed. Kelvin-type elemental deformations are used for describing the viscoelastic creep and the whole constitutive model is implemented into the Umat user subroutine of Abaqus FEM code. The crack growth simulation under short-term loading is done by using a suitable exponential damage law and the cohesive elements of Abaqus in the fracture process zone. The proposed computational approach is validated by analyzing glued laminated (glulam) specimens under opening mode and the numerical load-displacement curves are compared with both literature results and experimental data obtained in the context of the present research. For long-term fracture tests under sustained loads and constant moisture content, a criterion of crack initiation based on a viscoelastic integral parameter is also introduced. Both the proposed constitutive model and the computational approach can be further extended to cases of crack propagation in the presence of variable humidity conditions.

AB - This paper presents a three-dimensional orthotropic-viscoelastic model for the analysis of cracked glulam structures under short-term loading or sustained loads. Both conditions of constant and variable humidity are analyzed. Kelvin-type elemental deformations are used for describing the viscoelastic creep and the whole constitutive model is implemented into the Umat user subroutine of Abaqus FEM code. The crack growth simulation under short-term loading is done by using a suitable exponential damage law and the cohesive elements of Abaqus in the fracture process zone. The proposed computational approach is validated by analyzing glued laminated (glulam) specimens under opening mode and the numerical load-displacement curves are compared with both literature results and experimental data obtained in the context of the present research. For long-term fracture tests under sustained loads and constant moisture content, a criterion of crack initiation based on a viscoelastic integral parameter is also introduced. Both the proposed constitutive model and the computational approach can be further extended to cases of crack propagation in the presence of variable humidity conditions.

KW - Mode I and Mode II crack growth

KW - glulam

KW - cohesive elements

KW - moisture-stress analysis

KW - J integral

KW - FEM

KW - Abaqus

M3 - Conference article in proceedings

BT - WCTE 2010, World Conference on Timber Engineering

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Mendicino AL, Fortino S, Henning M, Dill-Langer G. A computational method for crack growth in glulam under variable humidity. In WCTE 2010, World Conference on Timber Engineering: Conference Proceedings. Trento, Italy. 2010