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MECHANICAL CHARACTERIZATION OF WOOD AT THE SUBMI-CROMETRE SCALE: A PROSPECTIVE STUDY

机译:木材在半透明尺度下的机械表征:前瞻性研究

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Measuring the elasto(plastic) properties of an homogeneous and isotropic material is now usually available at the microscopic scale by using nanoindentation and AFM techniques. Some studies show the possibility to measure elastic properties of anisotropic materials, some approaches try to determine the elastic properties of multi-layered isotropic material at the nano or micrometre scale and local measurements by nanoindentation on wood have already shown that mechanical properties of each cell wall layer can be estimated if these layers are sufficiently thick. The goal here is to extend these techniques to the case of any type of cell-wall layer using reverse identification of the mechanical properties. As a first step, the measurement of elastic properties on reference materials like sulfur monocristal or polymers using different AFM techniques has been tried: nanoindentation with an AFM tip vs. force modulation mode, which already provides qualitative results on wood cell walls . Theoretical lateral resolution and the sensibility to the apparent tip/sample contact have been estimated. Preliminary tests on wood specimens are under way.
机译:现在,通常可以使用纳米压痕和AFM技术在微观尺度上测量均质和各向同性材料的弹(塑性)性能。一些研究表明可以测量各向异性材料的弹性,一些方法试图在纳米或微米尺度上确定多层各向同性材料的弹性,而在木材上通过纳米压痕进行局部测量已经表明,每个单元壁的机械性能如果这些层足够厚,则可以估计该层。这里的目标是通过对机械性能的反向识别,将这些技术扩展到任何类型的细胞壁层的情况。第一步,已尝试使用不同的AFM技术测量参考材料(如单晶体硫或聚合物)的弹性性能:具有AFM尖端的纳米压痕与力调制模式的对比,这已经在木质细胞壁上提供了定性结果。估计了理论的横向分辨率和对明显的尖端/样品接触的敏感性。木材标本的初步测试正在进行中。

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