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

机译:木材尺度木材的机械表征:预期研究

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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:测量均匀和各向同性材料的弹性体(塑料)性质现在通常通过使用纳米狭窄和AFM技术在微观尺度上提供。一些研究表明,测量各向异性材料的弹性性质的可能性,一些方法尝试确定多层各向同性材料在纳米或微米尺度上的弹性性能,并通过木材的纳米压痕的局部测量已经表明每个细胞壁的机械性能如果这些层足够厚,则可以估计层。这里的目标是使用反向识别机械性能将这些技术扩展到任何类型的细胞壁层的情况。作为第一步,已经尝试了使用不同AFM技术的参考材料上的弹性性能的测量:已经使用不同的AFM技术的聚合物:用AFM尖端与力调制模式进行纳米indentation,这已经在木材电池壁上提供定性结果。已经估计了理论横向分辨率和对表观尖端/样品接触的敏感性。在木材标本上进行初步测试。

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