| 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 |
Experimental Characterization of Mode II Traction-Separation Laws for Adhesively-Bonded Composites Using an End-Loaded Split Configuration |
| Author(s) |
Connor Farrell, Michael Czabaj |
| On-Site Speaker (Planned) |
Connor Farrell |
| Abstract Scope |
Adhesively-bonded joints used in composite aerospace structures often experience shear loading that can lead to mode II driven fracture. As a consequence, standardized test methods must be developed to characterize mode II fracture of ductile and quasi-ductile adhesive bondlines. One promising method is the J-integral approach applied to the end-loaded split (ELS) specimen configuration. The J-integral approach allows for a large fracture process zone to exist at the crack tip, and does not require knowledge of the instantaneous crack length or properties of the adhesive to determine fracture toughness. Use of this method with the ELS test provides a measurement of the nonlinear fracture toughness (JIIc) and the mode II traction-separation law (TSL). In this work, the ELS test is further developed to characterize mode II fracture in adhesively bonded composites using the J-integral approach. A thorough evaluation of current data reduction methods for calculating JIIc and extracting the mode II TSL using finite-element analysis is conducted. Additionally, an experimental procedure for quasi-static testing of ELS specimens is developed using IM7/8552 carbon epoxy adherends bonded with 3M AF-163 and AF-3109 film adhesives tested in a dual actuated load frame. Digital image correlation is used to measure strains and rotations needed for calculating JIIc and cohesive shear displacement needed for determination of the TSL. These values will be presented to serve as the starting point for potential standardization of the ELS test for characterization of mode II fracture in adhesive joints. |
| Proceedings Inclusion? |
Definite: Post-meeting proceedings |