Experimental determination of mode I fracture parameters in orthotropic materials by means of Digital Image Correlation

Riccardo Cappello; Giuseppe Pitarresi; José Xavier; Giuseppe Catalanotti

doi:10.1016/j.tafmec.2020.102663

Experimental determination of mode I fracture parameters in orthotropic materials by means of Digital Image Correlation

Riccardo Cappello
, Giuseppe Pitarresi
, José Xavier
, Giuseppe Catalanotti^*

^*Corresponding author for this work

School of Mechanical and Aerospace Engineering

Research output: Contribution to journal › Article › peer-review

24 Citations (Scopus)

266 Downloads (Pure)

Abstract

The mode I fracture parameters for an orthotropic body are directly calculated from full-field deformation measurements provided by Digital Image Correlation (DIC). Three complementary and direct approaches are evaluated and compared: (i) the determination of the Stress Intensity Factor (SIF) by fitting the displacement field using the analytical expression proposed by Lekhnitskii; (ii) the determination of the J-Integral by using the Energy Domain Integral (EDI) formulation on the raw DIC data; and (iii) the calculation of the J-Integral using the EDI approach on the displacement data fitted using Lekhnitskii's formulation. A comparative experimental study is performed by testing an IM7/8552 cross-ply laminate, and the effect of different parameters is analysed and discussed. The outcomes of this work show that, if an accurate choice of the parameters is performed, the different approaches lead to the same results.

Original language	English
Article number	102663
Journal	Theoretical and Applied Fracture Mechanics
Volume	108
Early online date	23 Jun 2020
DOIs	https://doi.org/10.1016/j.tafmec.2020.102663
Publication status	Published - 01 Aug 2020

Keywords

Digital image correlation
Energy domain integral
J-integral
Least squares fitting
Stress intensity factor

ASJC Scopus subject areas

General Materials Science
Condensed Matter Physics
Mechanical Engineering
Applied Mathematics

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Experimental determination of mode I fracture parameters in orthotropic materials by means of Digital Image Correlation
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Cite this

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title = "Experimental determination of mode I fracture parameters in orthotropic materials by means of Digital Image Correlation",

abstract = "The mode I fracture parameters for an orthotropic body are directly calculated from full-field deformation measurements provided by Digital Image Correlation (DIC). Three complementary and direct approaches are evaluated and compared: (i) the determination of the Stress Intensity Factor (SIF) by fitting the displacement field using the analytical expression proposed by Lekhnitskii; (ii) the determination of the J-Integral by using the Energy Domain Integral (EDI) formulation on the raw DIC data; and (iii) the calculation of the J-Integral using the EDI approach on the displacement data fitted using Lekhnitskii's formulation. A comparative experimental study is performed by testing an IM7/8552 cross-ply laminate, and the effect of different parameters is analysed and discussed. The outcomes of this work show that, if an accurate choice of the parameters is performed, the different approaches lead to the same results. ",

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T1 - Experimental determination of mode I fracture parameters in orthotropic materials by means of Digital Image Correlation

AU - Cappello, Riccardo

AU - Pitarresi, Giuseppe

AU - Xavier, José

AU - Catalanotti, Giuseppe

PY - 2020/8/1

Y1 - 2020/8/1

N2 - The mode I fracture parameters for an orthotropic body are directly calculated from full-field deformation measurements provided by Digital Image Correlation (DIC). Three complementary and direct approaches are evaluated and compared: (i) the determination of the Stress Intensity Factor (SIF) by fitting the displacement field using the analytical expression proposed by Lekhnitskii; (ii) the determination of the J-Integral by using the Energy Domain Integral (EDI) formulation on the raw DIC data; and (iii) the calculation of the J-Integral using the EDI approach on the displacement data fitted using Lekhnitskii's formulation. A comparative experimental study is performed by testing an IM7/8552 cross-ply laminate, and the effect of different parameters is analysed and discussed. The outcomes of this work show that, if an accurate choice of the parameters is performed, the different approaches lead to the same results.

AB - The mode I fracture parameters for an orthotropic body are directly calculated from full-field deformation measurements provided by Digital Image Correlation (DIC). Three complementary and direct approaches are evaluated and compared: (i) the determination of the Stress Intensity Factor (SIF) by fitting the displacement field using the analytical expression proposed by Lekhnitskii; (ii) the determination of the J-Integral by using the Energy Domain Integral (EDI) formulation on the raw DIC data; and (iii) the calculation of the J-Integral using the EDI approach on the displacement data fitted using Lekhnitskii's formulation. A comparative experimental study is performed by testing an IM7/8552 cross-ply laminate, and the effect of different parameters is analysed and discussed. The outcomes of this work show that, if an accurate choice of the parameters is performed, the different approaches lead to the same results.

KW - Digital image correlation

KW - Energy domain integral

KW - J-integral

KW - Least squares fitting

KW - Stress intensity factor

U2 - 10.1016/j.tafmec.2020.102663

DO - 10.1016/j.tafmec.2020.102663

M3 - Article

AN - SCOPUS:85086709867

SN - 0167-8442

VL - 108

JO - Theoretical and Applied Fracture Mechanics

JF - Theoretical and Applied Fracture Mechanics

M1 - 102663

ER -

Experimental determination of mode I fracture parameters in orthotropic materials by means of Digital Image Correlation

Abstract

Keywords

ASJC Scopus subject areas

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