TY - JOUR
T1 - Determination of mode I dynamic fracture toughness of IM7-8552 composites by digital image correlation and machine learning
AU - Cidade, Rafael A.
AU - Castro, Daniel S. V.
AU - Castrodeza, Enrique M.
AU - Kuhn, Peter
AU - Catalanotti, Giuseppe
AU - Xavier, Jose
AU - Camanho, Pedro P.
N1 - To both the Brazilian National Council for Scientific and Technological Development (CNPq) for the split-site doctoral program scholarship at Faculdade de Engenharia da Universidade do Porto (under grant no. 206575/2014-9), and to the Brazilian National Council for the Improvement of Higher Education (CAPES) for the doctoral scholarship of Rafael Cidade. P. P. Camanho would like to acknowledge the funding of Project NORTE-01-0145-FEDER-000022 -SciTech Science and Technology for Competitive and Sustainable Industries, cofinanced by Programa Operacional Regional do Norte NORTE2020, Portugal, through Fundo Europeu de Desenvolvimento Regional (FEDER).
PY - 2019/2/15
Y1 - 2019/2/15
N2 - An optical experimental procedure for evaluating the J-Integral from full-field displacement fields under dynamic loading is proposed in this work. The methodology is applied to measure the J-integral in the dynamic compressive loading of fiber-reinforced composites and to calculate the dynamic fracture toughness associated with the propagation of a kink-band. A modified J-Integral that considers inertia effects is calculated over the full-field measurements obtained by digital image correlation, for double edge-notched specimen of IM7-8552 laminates dynamically loaded in a split-Hopkinson pressure bar (SHPB). A sensibility study is conducted to address the influence of the speckle parameters. The results show good agreement with experimental observations obtained by using a different data reduction method, suggesting the existence of a rising R-curve for the studied material under dynamic loading. Furthermore, it was noticed that the inertia effect can be negligible, indicating a state of dynamic equilibrium in which quasi-static approaches may comfortably be used.
AB - An optical experimental procedure for evaluating the J-Integral from full-field displacement fields under dynamic loading is proposed in this work. The methodology is applied to measure the J-integral in the dynamic compressive loading of fiber-reinforced composites and to calculate the dynamic fracture toughness associated with the propagation of a kink-band. A modified J-Integral that considers inertia effects is calculated over the full-field measurements obtained by digital image correlation, for double edge-notched specimen of IM7-8552 laminates dynamically loaded in a split-Hopkinson pressure bar (SHPB). A sensibility study is conducted to address the influence of the speckle parameters. The results show good agreement with experimental observations obtained by using a different data reduction method, suggesting the existence of a rising R-curve for the studied material under dynamic loading. Furthermore, it was noticed that the inertia effect can be negligible, indicating a state of dynamic equilibrium in which quasi-static approaches may comfortably be used.
KW - Digital image correlation (DIC)
KW - Dynamic fracture toughness
KW - Fiber-reinforced composite materials
KW - J-Integral
UR - http://www.scopus.com/inward/record.url?scp=85057770678&partnerID=8YFLogxK
U2 - 10.1016/j.compstruct.2018.11.089
DO - 10.1016/j.compstruct.2018.11.089
M3 - Article
AN - SCOPUS:85057770678
SN - 0263-8223
VL - 210
SP - 707
EP - 714
JO - Composite Structures
JF - Composite Structures
ER -