Zakia Khelifi1,2, Mohammed Amine Allal2, Nabil Abou-bekr2, Saïd Taïbi1, Benoît Duchemin1*
Journal of Renewable Materials, Vol.6, No.3, pp. 336-346, 2018, DOI:10.7569/JRM.2018.634102
Abstract The in-soil biodegradation of Stipa tenacissima (alfa) leaves was examined. Non-linear mechanical testing was performed at various biodegradation stages. Tensile strength, loading and unloading Young's moduli and dissipation energy decreased with the burial time, whereas plasticity increased. Field-emission scanning electron microscopy (FE-SEM) showed that the fracture cracks propagated in the longitudinal direction in the raw material, resulting in a fracture mode consisting of a mixture of middle lamella delamination and fiber pull-out. In contrast, the cracks were perpendicular to the stem axis in the biodegraded material, demonstrating an important strength loss of the load-bearing fibers. More >
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