TY - JOUR
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
N1 - UIDB/00667/2020
Sem PDF conforme despacho.
PY - 2020/8
Y1 - 2020/8
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
UR - http://www.scopus.com/inward/record.url?scp=85086709867&partnerID=8YFLogxK
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 -