Cellulose Microfibril Angle in Wood and Its Dynamic Mechanical Significance

Tabet, Tamer A.; Aziz, Fauziah Abdul

doi:10.5772/51105

Cited by 19 publications

(11 citation statements)

References 18 publications

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“…For instance, extensibility of latewood fibres of Picea Abies is around 2%-points (MFA 5°), while for springwood fibres it is around 13%-points (MFA 50°) (Reiterer et al 1998). It was also shown that the fibres with high MFA in Acacia mangium have lower glass transition temperature, which indicates certain differences in the composition and arrangement of wood polymers in the cell in comparison with latewood fibres (Tabet and Aziz 2013).…”

Section: Fibrillar Anglementioning

confidence: 98%

Boosting the extensibility potential of fibre networks: A review

2014

BioRes

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Production of paper-based packaging is growing at the present moment and has great future prospects. However, the development of new packaging concepts is creating a demand for an improvement in the mechanical properties of paper. Extensibility is one of these properties. Highly extensible papers have the potential to replace certain kinds of plastics used in packaging. Extensibility is also important for the sack and bag paper grades and for runnability in any converting process. This paper reviews the factors that affect the extensibility of fibres and paper, and discusses opportunities for improving the straining potential of paper and paper-like fibre networks. It is possible to classify factors that affect extensibility into three main categories: fibre structure, interfibre bonding, and structure of the fibre network. Extensibility is also affected by the straining situation and the phase state of the polymers in the cell wall. By understanding the basic phenomena related to the elongation, and by combining different methods affecting the deformability of fibre network, extensibility of paper can be raised to a higher level.

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Section: Fibrillar Anglementioning

confidence: 98%

Boosting the extensibility potential of fibre networks: A review

2014

BioRes

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“…The published and widely used material characteristics, frequency response and vibrational properties for wood materials are outputs of measurements and structural models (e.g. [18][19][20][21][22][23][24]). Wood choice for instruments manufacturing is also affected by geo-cultural and economic motives (e.g.…”

Section: Introductionmentioning

confidence: 99%

Piano Soundboard Analysis at Radiated Sound

Jenei-Kulcsár

Fiala

2023

Period. Polytech. Elec. Eng. Comp. Sci.

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The piano is a complex musical instrument consisting of several components influencing vibration and sound production. By understanding the sound production mechanism virtual instruments can be created (physics-based sound synthesis) and the design and manufacturing of soundboards can be supported (virtual prototyping). Based on previous results published in the literature, a piano model was built and extended by a near field sound radiation model capable for physics-based sound synthesis. In this paper a simplified piano model is presented, including hammer strike and hysteretic felt models, coupled lossy string model and a 2D FEM based stiffened plate model for soundboard. This paper contains a parametric study where the soundboard parameters, such as its material characteristics and boundary conditions, are modified and their effect on the soundboard's modal behavior and the radiated sound is analyzed. Instead of using only musical (qualitative) descriptors, e.g. brightness or coloring, the piano sounds are characterized based on standard quantitative descriptors (e.g. harmonic ratio, spectral centroid). It is shown that these descriptors are determined by soundboard admittance, string characteristics and position on the soundboard; radiated sound from wooden soundboards can be characterized as harmonic for wide range of initial material descriptors; the string position is essential, and the perceived sound can differ significantly for different listening positions, even for the same harmonic decay pattern.

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“…Microfibrils ar-rangement is the basic of dividing cell wall layers (Cave and Walker, 1994). Lignin is an amorphous phenol, and the cellulose and hemicellulose are linear polysaccharides (Tabet and Aziz, 2013). According to Arzola-Villegas et al (2019), primary wall and middle lamella are grouped into a layer called the compound middle lamella due to them being almost identical.…”

Section: Introduction 1 Uvodmentioning

confidence: 99%

Čimbenici koji utječu na proces savijanja cjelovitog drva

et al. 2023

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The effect of temperature and moisture on the behaviour of solid wood is a well-known fact that directly affects wood creep as well. Wood creep includes three types of behaviour, such as viscoelastic creep, mechano-sorptive creep, and pseudo-creep and recovery. All these types can occur simultaneously, and it is sometimes complicated for researchers to isolate or distinct one from another. This paper presents a review of literature on wood rheology and creep properties, as well as factors that influence them, mainly time, temperature, and moisture content. The study of the viscoelasticity and wood creep is very important for gaining knowledge to be applied in solid wood bending.

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Cellulose Microfibril Angle in Wood and Its Dynamic Mechanical Significance

Cited by 19 publications

References 18 publications

Boosting the extensibility potential of fibre networks: A review

Boosting the extensibility potential of fibre networks: A review

Piano Soundboard Analysis at Radiated Sound

Čimbenici koji utječu na proces savijanja cjelovitog drva

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