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Mode-I behavior of adhesively bonded composite joints at high loading rates

Ravindran, Suraj and Sockalingam, Subramani and Kodagali, Karan and Kidane, Addis and Sutton, Michael A. and Justusson, Brian and Pang, Jenna (2020) Mode-I behavior of adhesively bonded composite joints at high loading rates. Composites Science and Technology, 198 . Art. No. 108310. ISSN 0266-3538.

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This study investigates the high loading rate behavior of adhesively bonded carbon/epoxy composite joints under mode I loading. A computationally guided experimental setup is developed to study the mode-I behavior of composite joints in the range of quasi-static to high loading rates. A double cantilevered beam specimen with wedge insert type loading setup is used to conduct quasi-static and dynamic experiments. For the dynamic loading, a modified split Hopkinson bar is used to load the sample at high rates. The local deformation field is measured using high Spatio-temporal resolution digital image correlation (DIC). From the experiments, the mode-I energy release rate is calculated from the load, crack extension and crack root rotation data measured using load cell and DIC. A decrease in the initiation fracture toughness with increase in loading rate was observed which is attributed to the strain rate dependent behavior of the epoxy-based film adhesive. For both quasi-static and high loading rates, a mixed adhesive-cohesive failure is observed from the fracture surface analysis.

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Ravindran, Suraj0000-0003-2930-7906
Additional Information:© 2020 Elsevier Ltd. Received 6 January 2020, Revised 18 May 2020, Accepted 17 June 2020, Available online 20 June 2020. The material is based upon work supported by NASA under Award Nos. NNL09AA00A and 80LARC17C0004. Any opinions, findings, and conclusions or recommendations expressed in this material are those of the author(s) and do not necessarily reflect the views of the NASA. The authors gratefully acknowledge the technical contributions from the following: The Boeing Company: Mr. Matthew Molitor, Dr. Mostafa Rassaian, NIAR: Mr. Akhil Bhasin and Dr. Luiz Gomez. CRediT authorship contribution statement: Suraj Ravindran: Formal analysis, Investigation, Methodology, Validation, Visualization, Writing - original draft. Subramani Sockalingam: Conceptualization, Formal analysis, Investigation, Methodology, Validation, Visualization, Supervision, Writing - original draft, Funding acquisition. Karan Kodagali: Formal analysis, Investigation, Methodology, Validation, Visualization, Writing - original draft. Addis Kidane: Conceptualization, Methodology, Supervision, Funding acquisition. Michael A. Sutton: Conceptualization, Methodology, Funding acquisition. Brian Justusson: Conceptualization, Methodology, Writing - review & editing. Jenna Pang: Methodology, Project administration, Writing - review & editing. The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
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Subject Keywords:Interlaminar; Fracture toughness; Mode-I; DCB; High strain rate; Adhesive bonded joint
Record Number:CaltechAUTHORS:20200623-151419413
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Official Citation:Suraj Ravindran, Subramani Sockalingam, Karan Kodagali, Addis Kidane, Michael A. Sutton, Brian Justusson, Jenna Pang, Mode-I behavior of adhesively bonded composite joints at high loading rates, Composites Science and Technology, Volume 198, 2020, 108310, ISSN 0266-3538, (
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:103970
Deposited By: Tony Diaz
Deposited On:23 Jun 2020 22:39
Last Modified:29 Oct 2020 23:46

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