About this Abstract |
Meeting |
2024 ASC Technical Conference, US-Japan Joint Symposium, D30 Meeting
|
Symposium
|
2024 ASC Technical Conference, US-Japan Joint Symposium, D30 Meeting
|
Presentation Title |
Characterization of Mode I Fatigue Fracture in Tape Laminates and Adhesively Bonded Composites Based on the J-Integral Approach |
Author(s) |
Michael Czabaj |
On-Site Speaker (Planned) |
Michael Czabaj |
Abstract Scope |
Characterization of mode I fatigue fracture in tape laminates and adhesively bonded composites is of great interest to the composites community. To-date, there has been considerable effort placed on characterizing mode I fatigue delamination onset and propagation in tape laminates, and somewhat less attention has been placed on characterizing fatigue crack growth in adhesive bondlines. In this work, we develop an experimental methodology for characterization of mode I fatigue fracture based on the J-integral approach. The salient feature of this approach is that it can accurately measure the strain energy release rate (SERR) for both brittle and ductile interfaces, provided that no other energy dissipating mechanism exists (e.g., yielding/damage of specimen arms). In addition, the mode I J-integral calculation of the SERR does not require explicit knowledge of the delamination/crack length or the specimen material properties, which greatly simplifies the data reduction procedure. The novel aspect of the present work is that all fatigue experiments are conducted by directly controlling the SERR obtained in real-time from the J-integral calculation, as opposed to doing so using displacement or force control. Because of the difficulty of accurately obtaining crack lengths during fatigue testing of adhesive bondlines, 2D digital image correlation is used to determine the crack growth rate. To demonstrate the utility of this approach, specimens are tested under both constant and stepwise increasing/decreasing ΔJ values. The stepwise control of ΔJ is used to obtain fully populated da/dN vs. ΔJ curve from a single test specimen. |
Proceedings Inclusion? |
Definite: Post-meeting proceedings |