Über das elastische Verhalten von Fichtenholz in Abhängigkeit von der Holzfeuchtigkeit

Neuhaus, H.

doi:10.1007/bf02608449

Cited by 46 publications

(57 citation statements)

References 3 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Applying the values of Neuhaus (1981) to such a comparison, we found differences in L-direction of 9% and in R-and T-direction, respectively, of 34%; the same values in R-and T-direction are the result of the similarities given above. Furthermore, any relations as used for bones between C 66 , C 11 and C 12 , and in the case of wood also of C 22, cannot be found.…”

Section: Calculation Of Young's and Shear Modulimentioning

confidence: 69%

See 1 more Smart Citation

Determination of Young’s and shear moduli of common yew and Norway spruce by means of ultrasonic waves

et al. 2006

View full text Add to dashboard Cite

Despite the exceptional position of yew among the gymnosperms concerning its elastomechanical properties, no reference values for its elastic constants apart from the longitudinal Young's modulus have been available from literature so far. Hence, this study's objective was to determine the Young's moduli E L , E R and E T and the shear moduli G LR , G LT and G RT of yew wood. For that purpose, we measured the ultrasound velocities of longitudinal and transversal waves applied to small cubic specimens and derived the elastic constants from the results. The tests were carried out at varying wood moisture contents and were applied to spruce specimens as well in order to put the results into perspective. Results indicate that E L is in the same order of magnitude for both species, which means that a high-density wood species like yew does not inevitably have to have a high longitudinal Young's modulus. For the transverse Young's moduli of yew, however, we obtained 1.5-2 times, for the shear moduli even 3-6 times higher values compared to spruce. The variation of moisture content primarily revealed differences between both species concerning the shear modulus of the RT plane. We concluded that anatomical features such as the microfibril angle, the high ray percentage

show abstract

Section: Calculation Of Young's and Shear Modulimentioning

confidence: 69%

“…In absolute values in (kN/mm 2 ) -1 the upper left part of the stiffness tensor given by Neuhaus (1981 …”

Section: Calculation Of Young's and Shear Modulimentioning

confidence: 99%

Determination of Young’s and shear moduli of common yew and Norway spruce by means of ultrasonic waves

et al. 2006

View full text Add to dashboard Cite

show abstract

“…(2), depend on the MC. From the findings of Neuhaus (1981) the following relation between the elastic parameters S (may be substituted by E, G or n) and the MC could be found:…”

Section: Mechanical Modelmentioning

confidence: 99%

“…The swelling coefficients were chosen according to Neuhaus (1981) and Sell (1997) to a R s1.7•10 -3 and a T s3.3•10 -3 , and according to Dahlblom et al (1999) (see also Ormarsson 1999) to a L s5.0•10 -5 (all non-dimensional). The mechano-sorptive material parameters are based on results obtained by Santaoja et al (1991) andMå rtensson (1992) and are set to be independent of the MC.…”

Section: Mechanical Modelmentioning

confidence: 99%

Experimental and numerical determination of the hygroscopic warping of cross-laminated solid wood panels

Gereke

Gustafsson

Persson

et al. 2009

HFSG

View full text Add to dashboard Cite

The moisture-induced warping of three-layered crosslaminated solid wood panels made of Norway spruce was studied. The panels were exposed to different climate conditions at 65% and 100% relative humidity at the two panel faces. The results showed increasing cup deformation with an increasing relative thickness of the outer layers. The annual growth ring orientation was found to have a significant influence on the magnitude of the cup deformation. Measurements and numerical simulations of the moisture distribution within the panel were made in order to provide data for numerical simulations of the warping. A distinctive moisture profile with a conspicuous influence of the adhesive bond lines was found. The coefficient of diffusion of the adhesive bond lines was determined from the measurements and simulations. The mechanical material model used for the warping simulations takes into account elastic strain, moisture-induced swelling, and mechano-sorptive strain. The simulations showed good agreement with the warping test results. The most important material parameters for the cup deformation, which were identified in a parametric study of a panel with vertically oriented annual rings, are the moduli of elasticity and the swelling coefficients in the longitudinal and radial direction. Furthermore, the mechano-sorptive coefficient in radial direction was found to have a significant influence on warp.

show abstract

“…Selected parameters of ash and other hardwoods have been published by Baumann (1922), Stamer (1935), Kollmann (1941Kollmann ( , 1951, Kühne (1951), Leclerco (1975), Bodig and Jayne (1993), Sliker and Yu (1993), Szalai (1994), Wagenführ (1996), Pozgaj et al (1997), Sell (1997), DIN 68364 (2003, Bonoli et al (2005), amongst others. A few authors also presented results obtained for the traverse directions of individual softwood and hardwood species, such as Hörig (1933), Wommelsdorf (1966), Neuhaus (1983), Keunecke et al (2008), Hering et al (2012), and Ozyhar et al (2012). However, especially in the case of hardwoods, complete data sets for the three main anatomical directions rarely exist that are sufficient for static calculations and modeling in wood construction, and for calculations on multilayered boards, parquet, or musical instruments with the finite element (FE) method.…”

Section: Introductionmentioning

confidence: 99%

Anisotropic elastic properties of common ash (Fraxinus excelsior L.)

2014

View full text Add to dashboard Cite

Hardwoods in principle show a similar orthotropic behavior as softwoods; however, the ratios of the mechanical parameters between the three anatomical directions and their magnitudes are different and depend strongly on the individual microstructure of the species. The aim of the current study was to characterize the 3-D elastic behavior of common ash (Fraxinus excelsior L.) by tensile, compression, and shear tests in the three anatomical directions and stepwise in between, by means of a universal testing machine in combination with a digital image correlation technique. Young's moduli, shear moduli, and Poisson's ratios have been determined for the different load directions. From studies on the radial-tangential plane of other wood species, it is known that the elastic moduli in the principal directions and the off-axis elastic moduli vary in a nonlinear correlation, depending on density gradients between earlywood and latewood. This angular dependency has been experimentally and theoretically proven for ash. Furthermore, the dependency of mechanical parameters on the fiber-load angle has been experimentally determined. The measurements for principal and off-axis load directions provide a sound basis for modeling of hardwood structures.

show abstract

Über das elastische Verhalten von Fichtenholz in Abhängigkeit von der Holzfeuchtigkeit

Cited by 46 publications

References 3 publications

Determination of Young’s and shear moduli of common yew and Norway spruce by means of ultrasonic waves

Determination of Young’s and shear moduli of common yew and Norway spruce by means of ultrasonic waves

Experimental and numerical determination of the hygroscopic warping of cross-laminated solid wood panels

Anisotropic elastic properties of common ash (Fraxinus excelsior L.)

Contact Info

Product

Resources

About