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

Suraj Ravindran, Subramani Sockalingam, Karan Kodagali, Addis Kidane, Michael A. Sutton, Brian Justusson, Jenna Pang

Research output: Contribution to journalArticlepeer-review

18 Scopus citations

Abstract

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.

Original languageEnglish (US)
Article number108310
JournalComposites Science and Technology
Volume198
DOIs
StatePublished - Sep 29 2020
Externally publishedYes

Bibliographical note

Funding Information:
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.

Funding Information:
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.

Publisher Copyright:
© 2020 Elsevier Ltd

Keywords

  • Adhesive bonded joint
  • DCB
  • Fracture toughness
  • High strain rate
  • Interlaminar
  • Mode-I

Fingerprint

Dive into the research topics of 'Mode-I behavior of adhesively bonded composite joints at high loading rates'. Together they form a unique fingerprint.

Cite this