Journal
COMPOSITE STRUCTURES
Volume 203, Issue -, Pages 110-123Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.compstruct.2018.06.122
Keywords
Date palm; Petiole wood; Fatigue; Morphology
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Funding
- Campus France-the French national agency for the promotion of higher education, international student services, and international mobility [17MDU996 PHC]
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Large quantity of date palm wastes annually accumulate in Algeria. We investigate date palm petiole wood (DPPW) and macroscopic fibers from northern and southern Algeria by X-ray tomography, monotonic tension and compression, microscopy analysis, and fatigue tensile tests. DPPW is a unidirectional composite (V-F = 25%, rho = 210 kg m(-3)) consisting of a fibrovascular ultrastructure (reinforcement) and parenchyma (matrix). Mechanical properties of southern DPPW (E = 0.5 GPa, sigma(u) = 6 MPa, epsilon(u) = 1.75%) are higher than northern ones because of the dry climatic conditions, its density also is higher. Main failure modes are cell-wall tearing and spheroidal-cell detachment (parenchyma), and pull-out or net fracture (fibers). Stress ratio is the major fatigue parameter, R = 0.125 is a limit of endurance for transverse southern DPPW. High mechanical homogeneity of DPPW along that direction reduces the risk for damage development. Thanks to limited density, high fatigue life, and neglectable cost, DPPW is a good candidate for local development of sandwich core.
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