Identification of stiffness tensor components of wood cell walls by means of nanoindentation

Jäger, Andreas; Hofstetter, Karin; Buksnowitz, Ch.; Gindl‐Altmutter, Wolfgang; Konnerth, Johannes

doi:10.1016/j.compositesa.2011.09.020

Cited by 50 publications

(53 citation statements)

References 35 publications

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“…Each data point corresponds to the mean values reported from the literature for non-modified wood samples; with reduced modulus back calculated when necessary. Filled rectangles correspond to softwood samples Tze et al 2007;Konnerth et al 2009;Brandt et al 2010;Jäger et al 2011b), whereas unfilled triangles correspond to hardwood sample (Wu et al 2009;De Borst et al 2012). In contrast to Fig.…”

Section: Nanoindentationmentioning

confidence: 86%

“…However, stiffness changes due to changes in microfibril angle are lower for nanoindentation compared to tensile tests, in particular for microfibril angles below 20°and above 60°. The rather strong sensitivity of nanoindentation tests to changes in microfibril angle in the range of 20°-60°implies that samples need to be properly aligned with respect to the actual microfibril angle in the indentation volume (Konnerth et al 2009;Jäger et al 2011b). The high data scattering in Fig.…”

Section: Nanoindentationmentioning

confidence: 99%

“…Anisotropic models for the reduced modulus obtained by nanoindentation have been successfully applied in the case of the softwood S 2 -layer by Jäger et al (2011a). Such models can be used for a reverse identification of some of the elastic moduli of the S 2 -wall, for details see review paper by Gamstedt et al (this issue) and Jäger et al (2011b).…”

Section: Nanoindentationmentioning

confidence: 99%

“…2 where the x-axis ends at 50°, which is a natural limitation (microfibril angles higher than 50°are typically not found in wood fibres), the x-axis of the diagram in Fig. 3 is extended to 90°because here samples can be rotated or tilted which allows indenting transversely to the cellulose fibril alignment (Brandt et al 2010;Jäger et al 2011b). Again, absolute values of stiffness obtained by nanoindentation in the S 2 -layer are much lower than what is normally expected for the longitudinal modulus (Fig.…”

Section: Nanoindentationmentioning

confidence: 99%

“…Due to the complex deformation field under the indenter tip, the indentation modulus of anisotropic materials therefore can only be viewed as being a sort-of ''geometric average'' of the elastic tensor (Vlassak et al 2003;Jäger et al 2011a). A correct estimation of all (or some) anisotropic material elastic parameters requires more information about the material eigen directions such as its microfibril angle ) combined with further experiments using different load, indenter shapes and orientations (Jäger et al 2011b). …”

Section: Indentation Modulusmentioning

confidence: 99%

See 4 more Smart Citations

Experimental micromechanical characterisation of wood cell walls

et al. 2012

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The properties of wood and wood-based materials are strongly dependent on the properties of the fibres, that is, the cell wall properties. It is thus highly important to be able to mechanically characterise cell walls in order to understand structure-property relationships. This article gives a brief overview of the state of the art in experimental techniques to characterise the mechanical properties of wood at both the level of the single cell and that of the cell wall. Challenges, opportunities, drawbacks and limitations of single fibre tensile tests and nanoindentation are discussed with respect to the wood material properties. Introduction and background

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Section: Nanoindentationmentioning

confidence: 86%

Section: Nanoindentationmentioning

confidence: 99%

Section: Nanoindentationmentioning

confidence: 99%

Section: Nanoindentationmentioning

confidence: 99%

Section: Indentation Modulusmentioning

confidence: 99%

See 3 more Smart Citations

Experimental micromechanical characterisation of wood cell walls

et al. 2012

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Mechanical properties of pentaerythritol tetranitrate(PETN) single crystals from nano‐indentation: Depth dependent response at the nano meter scale

Zhai

McKenna

2016

Crystal Research and Technology

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The current work presents the results from an investigation of the mechanical behavior of single crystals of the energetic material pentaerythritol tetranitrate (PETN) using a nano‐indentation technique. The indentation tests have been performed on the maximum growth habit face (110) of the PETN, using a spherical, Berkovich and an anisometric (wedge‐shaped) tip. The load displacement curves along with analysis have been used to extract the mechanical properties and identify the anisotropic indentation modulus for the PETN. The indentation moduli of the PETN single crystal were found to decrease as indentation depth increases and become independent of indentation depth for depths greater than 200 nm for the spherical indenter and 300 nm for the anisometric wedge indenter and Berkovich tip. The indentation modulus obtained from spherical tip indentation is compared with the results calculated by using literature values of the elastic constants. The wedge indenter measurements and Berkovich indentation at various tip orientations are different due to the anisotropy of the PETN. The yield behaviors of the PETN single crystal were also explored using both spherical and wedge tip indentation and the differences are discussed.

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Physical, Mechanical and Acoustical Properties of Cane for Reeds

Bucur

2019

Handbook of Materials for Wind Musical Instruments

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Identification of stiffness tensor components of wood cell walls by means of nanoindentation

Cited by 50 publications

References 35 publications

Experimental micromechanical characterisation of wood cell walls

Experimental micromechanical characterisation of wood cell walls

Mechanical properties of pentaerythritol tetranitrate(PETN) single crystals from nano‐indentation: Depth dependent response at the nano meter scale

Physical, Mechanical and Acoustical Properties of Cane for Reeds

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