Investigation of the transverse fracture mechanisms of bamboo by the finite element method
Source abstract
Abstract
Natural composite materials tend to exhibit unique interlaminar fracture mechanisms in comparison to other materials given their specific structural arrangement and orthotropic nature. This research investigation is focused on a comparative study of the fracture mechanisms involving wood and bamboo by taking into account their structural arrangement, namely grain distribution and orthotropic material characteristics. In the first part of this study, the nominal fracture toughness of bamboo was determined experimentally in a 3-point bending test by evaluating single-edge-notched bending (SENB) specimens. The difference in longitudinal-tangential (LT) specimens, which displayed the greatest fracture toughness in comparison to longitudinal-radial (LR) specimens in both materials, was found to be two-fold higher in bamboo than in wood. From analysis of scanning electron microscope (SEM), LR specimens were found to exhibit greater delamination in terms of interlaminar crack propagation as compared to LT specimens which predominantly exhibited transverse crack propagation. From the results of finite element method (FEM), the interlaminar fracture mechanisms in SENB specimens of LR and LT systems for corresponding orthotropic material model of bamboo and wood correlated well with experimental observations. Crack in the LT specimen was found to follow the initial pathway and propagated transversely into the material while in the LR specimen, crack tip deviated from their initiation pathway and propagated along the weakest interface necessitating the lowest energy. Understanding the specific trait of fracture mechanisms with respect to their structural arrangement in natural composites can provide key knowledge to the development of artificial materials such as wood- or bamboo-inspired composites.
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Research context
OpenAlex topics: Bamboo properties and applications · Natural Fiber Reinforced Composites · Wood Treatment and Properties
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (55)
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