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Mixed mode fracture behavior of short-particle engineered wood

Highlights•Fracture behaviors of MDF and PB are investigated under mixed-mode loading conditions.•Elastic isotropy of the employed MDF and PB wood are verified via the DIC technique.•An improved three-point bend specimen is proposed for in-plane wood fracture tests.•The MTSN criterion is utilized to predict crack growth angle and fracture toughness.•Weibull statistical analysis is performed over the data of MDF and PB fracture tests.•Mode II fracture probability can be well-estimated using KIc and the MTSN criterion.AbstractThe present article discusses the fracture behavior of medium-density fiberboard (MDF) and particleboard (PB), under mixed mode loading conditions. With wide applications in construction, marine and furniture industry, MDF and PB are two well-known, wood-based composites that are made of wood particles and fibers, adhered together using a standard polymer glue. Our examination of the elastic properties of these wooden samples in transverse and longitudinal directions via the digital image correlation (DIC) technique sheds light on the elastic isotropy of the employed MDF and PB sheets. Moreover, with the introduction of an improved three-point bend configuration for in-plane wood fracture tests, the brittle behavior of engineered wood is evidenced, which validates the utilization of the linear elastic fracture mechanic (LEFM) concepts herein. Therefore, within the framework of LEFM, we apply the maximum tangential strain (MTSN) criterion to predict the fracture initiation angles and fracture toughness for wooden specimens. Finally, in a comprehensive Weibull statistical analysis over the MDF and PB fracture test data, it is shown that, the mode II test results can be well-estimated based on the value of KIf, using the MTSN criterion. This is especially beneficial when the probability of mode II fracture is sought after, given the mode I statistical parameters.

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