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research article

Toughening of thick bonded interfaces through architected crack-arresting features

Srinivasan, Dharun Vadugappatty  
•
Vassilopoulos, Anastasios P.  
January 1, 2025
Composites Part A: Applied Science and Manufacturing

This research investigates the application of additively manufactured crack-arresting features (CAFs), designed from tough and soft polymers, in enhancing the performance of thick glass fiber-reinforced polymer composite-epoxy adhesive joints found in wind turbine rotor blades. Mode I fracture and fatigue behaviors of these joints are assessed through double-cantilever beam experiments and compared against pristine joints. In pristine joints, cracks consistently deviate from the adhesive bondline into the composite adherend, causing a sudden increase in strain energy release rate. Finite element models based on linear elastic fracture mechanics are employed to provide insight into this behavior. Experimental results demonstrate that joints with architected CAFs achieved higher strain energy release rates, more stable failure mechanisms, and minimized damage to the composite adherend. Under fatigue loading, joints featuring tough CAF material exhibit slower fatigue crack growth compared to both pristine joints and those with soft CAF material.

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Name

10.1016_j.compositesa.2024.108575.pdf

Type

Main Document

Version

http://purl.org/coar/version/c_970fb48d4fbd8a85

Access type

openaccess

License Condition

CC BY

Size

12.17 MB

Format

Adobe PDF

Checksum (MD5)

da2beeec6a6326ce7252188861e70335

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