Determination of mode I dynamic fracture toughness of IM7-8552 composites by digital image correlation and machine learning 机翻标题: 暂无翻译,请尝试点击翻译按钮。

来源
Composite structures
年/卷/期
2019 / 210 / Feb.
页码
707-714
ISSN号
0263-8223
作者单位
COPPE Fed Univ Rio de Janeiro, Dept Met & Mat Engn, POB 68505, BR-21941972 Rio De Janeiro, Brazil;COPPE Fed Univ Rio de Janeiro, Dept Met & Mat Engn, POB 68505, BR-21941972 Rio De Janeiro, Brazil;COPPE Fed Univ Rio de Janeiro, Dept Met & Mat Engn, POB 68505, BR-21941972 Rio De Janeiro, Brazil|Politecn Milan, Dept Mech Engn, Via La Masa 1, I-20156 Milan, Italy;Tech Univ Munich, Chair Carbon Composites, Dept Mech Engn, Boltzmannstr 15, Garching, Germany;Queens Univ Belfast, Sch Mech & Aerosp Engn, ACRG, Belfast BT9 5AH, Antrim, North Ireland;Inst Ciencia & Inovacao Engn Mecan & Engn Ind, Rua Dr Roberto Frias 400, P-4200465 Porto, Portugal|Univ Nova Lisboa, UNIDEMI, Fac Sci & Technol, Dept Mech & Ind Engn, Campus Caparica, P-2829516 Caparica, Portugal;Inst Ciencia & Inovacao Engn Mecan & Engn Ind, Rua Dr Roberto Frias 400, P-4200465 Porto, Portugal|Univ Porto, Fac Engn, DEMec, Rua Dr Roberto Frias S-N, P-4200465 Porto, Portugal;
作者
Cidade, Rafael A.;Castro, Daniel S., V;Castrodeza, Enrique M.;Kuhn, Peter;Catalanotti, Giuseppe;Xavier, Jose;Camanho, Pedro P.;
摘要
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.
机翻摘要
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关键词/主题词
Dynamic fracture toughness;Digital image correlation (DIC);J-Integral;Fiber-reinforced composite materials;
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