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  Microstructural features influencing the mechanical performance of the Brazil nut (Bertholletia excelsa) mesocarp

Sonego, M., Madia, M., Eder, M., Fleck, C., & Pessan, L. A. (2021). Microstructural features influencing the mechanical performance of the Brazil nut (Bertholletia excelsa) mesocarp. Journal of the Mechanical Behavior of Biomedical Materials, 116: 104306. doi:10.1016/j.jmbbm.2020.104306.

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 Creators:
Sonego, Marilia, Author
Madia, Mauro, Author
Eder, Michaela1, Author              
Fleck, Claudia, Author
Pessan, Luiz A., Author
Affiliations:
1Michaela Eder, Biomaterialien, Max Planck Institute of Colloids and Interfaces, Max Planck Society, ou_1863293              

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Free keywords: Brazil nut Mesocarp, Microstructure, Mechanical properties, Toughening mechanisms
 Abstract: Brazil nut (Bertholletia excelsa) fruits are capable of resisting high mechanical forces when released from trees as tall as 50 m, as well as during animal dispersal by sharp-teethed rodents. Thick mesocarp plays a crucial part in seed protection. We investigated the role of microstructure and how sclereids, fibers, and voids affect nutshell performance using compression, tensile and fracture toughness tests. Fractured specimens were analyzed through scanning electron microscopy (SEM) and microtomography (microCT). Mesocarp showed high deformability (strain at max. stress of ∼30) under compression loading, a critical tensile strength of ∼24.9 MPa, a Weibull modulus of ∼3, and an elastic modulus of ∼2 GPa in the tensile test. The fracture toughness, estimated through the work of fracture of SENB tests, reached ∼2 kJ/m2. The thick and strong walls of mesocarp cells, with a weaker boundary between them (compound middle lamella), promote a tortuous intercellular crack path. Several toughening mechanisms, such as crack deflection, breaking of fiber bundles, fiber pullout and bridging as well as crack branching, occur depending on how fiber bundles and voids are oriented.

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Language(s): eng - English
 Dates: 2021-01-072021
 Publication Status: Published in print
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 Identifiers: DOI: 10.1016/j.jmbbm.2020.104306
Other: Zustimmung aller Autoren zu Zweitveröffentlichung liegt in der Mailbox
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Title: Journal of the Mechanical Behavior of Biomedical Materials
  Abbreviation : J. Mech. Behav. Biomed. Mater.
Source Genre: Journal
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Publ. Info: Amsterdam : Elsevier
Pages: - Volume / Issue: 116 Sequence Number: 104306 Start / End Page: - Identifier: ISSN: 1751-6161
ISSN: 1878-0180