Variation in the Microfibril Angles in Resonance and Non-Resonance Spruce Wood (Picea abies [L.] Karst.)

Fabisiak, E.; Mania, Przemysław

doi:10.15376/biores.11.4.8496-8508

Cited by 4 publications

(4 citation statements)

References 28 publications

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“…Moreover the degree of cristallinity of the cellulose is also a source of variability. It has been higlighted in [14] that spruce tonewood exhibits a microfibril angle (MFA) that is two times lower than regular spruce. This study also showed that the MFA is smaller in latewood than in earlywood.…”

Section: Materials Propertiesmentioning

confidence: 99%

Simultaneous non-destructive identification of multiple elastic and damping properties of spruce tonewood to improve grading

Viala

Placet

Cogan

2020

Journal of Cultural Heritage

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The tonewoods used in musical instruments are finely selected and are subject to current and upcoming availability issues. Wood grading assesses the quality of the tonewood and depends on both subjective and objective criteria. Traditionally, grading criteria based on mechanical properties consider mainly the longitudinal direction. This paper investigates the elastic and damping properties of spruce wood used in the making of acoustical guitars and violins. In this context, the mechanical grading properties will be studied in multiple directions. A non-destructive vibrational characterization method is used to simultaneously identify at least six mechanical properties of wood and leads to the determination of the elastic and damping parameters of wood along the different material directions. The main objective is to quantify the variability of the mechanical properties in different material directions as a function of the grading attributed by the wood seller. The results show that material anisotropy decreases as the grade decreases. This is attributed to strong increase of the specific elastic modulus in the radial direction and the specific shear modulus in longitudinal and radial plane. Moreover, grading seems to be assigned as a function of specific elasticity and loss factor in the longitudinal direction, which is tied in with the preferences of instrument makers. Following the assumption that high specific modulus is desirable, the classification based on instrument makers choices can be improved for new grading criteria that consider directions than longitudinal. Moreover, the substitution of wood species and the proposal of new materials exhibiting equivalent elastic and damping properties can be proposed. Highlights • Simultaneous non-destructive determination of at least six elastic and damping properties of tonewood. • Description of elastic and damping properties as a function of tonewood grades. • Decrease of specific longitudinal modulus and increase of longitudinal loss factor for decreasing grades. • Increase of specific elastic modulus in radial direction and specific shear modulus in longitudinal and radial plane for decreasing grades.

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Section: Materials Propertiesmentioning

confidence: 99%

Simultaneous non-destructive identification of multiple elastic and damping properties of spruce tonewood to improve grading

Viala

Placet

Cogan

2020

Journal of Cultural Heritage

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“…The power function with the exponent of nearly 2.7 for samples in class I may indicate a significant impact of the microfibril angle (MFA) on the modulus of elasticity. Hence, the wood density is not the only determinant of its mechanical properties, as reported earlier (Raczkowski 1965;Zhang 1997;Roszyk et al 2010;Krauss and Kúdela 2011;Roszyk et al 2012;Fabisiak and Mania 2016). The impact of MFA is particularly pronounced for the wood of higher density, i.e., in latewood with smaller MFA values.…”

Section: Resultsmentioning

confidence: 52%

Optimization of spruce (Picea abies L.) wood thermal treatment temperature to improve its acoustic properties

Mania

Moliński

Roszyk

et al. 2019

BioRes

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The study was undertaken to establish the thermal treatment parameters of spruce (Picea abies L.) wood that would ensure the highest possible value of the specific modulus of elasticity (E/ρ) and, thus, the best acoustic performance. The basic acoustic parameters of spruce wood were determined prior to and after its thermal treatment. As a result of thermal treatment, the samples density slightly decreased by about 1%, irrespective of temperature applied. The average value of Young modulus of the samples after modification at 120 to 160 °C increased from 10.1 to 10.7 GPa (6%). The specific modulus of elasticity increased on average by 6.5%. Increase of the modification temperature to 180 °C resulted in decreasing of the values of mechanical parameters by over 4%.

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“…Every type of wood exhibits specific variability along a radial cross-section, which impacts subsequent uses of the wood. Coniferous species usually exhibit an increase in density and mechanical properties from the core to the perimeter [ 37 , 38 , 39 ]. Conversely, in ring-porous species, the opposite trend is found [ 40 , 41 , 42 ].…”

Section: Introductionmentioning

confidence: 99%

Radial Variability of Selected Physical and Mechanical Parameters of Juvenile Paulownia Wood from Extensive Cultivation in Central Europe—Case Study

et al. 2023

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The research on Paulownia cultivation and wood properties is up to date in many countries. However, there are no data on the properties of this wood defined on a microscale, on microtome samples. The main aim of this study was to find the best valorization path for the wood of Paulownia Shang Tong Hybrid F1 from an extensively cultivated plantation established in April 2017 in Poland by determining the tensile strength, the wood density, the strength-to-density ratio, and the modulus of elasticity on a cross-section of the trunk. The wood was collected from extensive plantation, where production is based on the natural resources of the habitat and ambient weather conditions, which is the opposite to the intensive cultivation model, which is the recommended model of Paulownia cultivation. The results of this study show that the mean density of the analyzed samples was approximately 210 kg/m3 when the mean value of the modulus of elasticity (MOE) was approximately 2400 MPa. The mean result for the tensile strength ratio to density was 11.25 km. In the case of anatomical structure, the increasing trend with age was noticed both in fiber and vessel characteristics. The study results provide unique data worldwide about Paulownia wood’s properties based on a cross-section of the trunk, from plantations cultivated in conditions which are not recommended by seedlings producers. The obtained data indicate that the Paulownia wood (examined) from the cultivation in this study has a technical quality similar to that of model-intensive agricultural plantations.

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Variation in the Microfibril Angles in Resonance and Non-Resonance Spruce Wood (Picea abies [L.] Karst.)

Cited by 4 publications

References 28 publications

Simultaneous non-destructive identification of multiple elastic and damping properties of spruce tonewood to improve grading

Simultaneous non-destructive identification of multiple elastic and damping properties of spruce tonewood to improve grading

Optimization of spruce (Picea abies L.) wood thermal treatment temperature to improve its acoustic properties

Radial Variability of Selected Physical and Mechanical Parameters of Juvenile Paulownia Wood from Extensive Cultivation in Central Europe—Case Study

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