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Nanohardness and elasticity of cell walls of Scots pine (Pinus sylvestris L.) juvenile and mature wood

100%

Mania P. , Nowicki M. , Mania P. , Nowicki M.

nr 5

Variability of macrostructural parameters in resonant spruce wood (Picea abies L.)

89%

Fabisiak E. , Mania P.

2013

tom 81

Nanohardness and elasticity of cell walls of Scots pine (Pinus sylvestris L.) juvenile and mature wood

89%

Mania P. , Nowicki M.

Bulletin of the Polish Academy of Sciences. Technical Sciences

2020

tom Vol. 68, nr 5

1237--1241

The aim of this study was to determine the hardness and reduced modulus of elasticity of juvenile wood of Scots pine (Pinus sylvestris L.) using the nanoindentation method, and then to compare the results obtained with those of mature wood. The hardness of juvenile pine wood determined by means of the nanoindentation method was 0.444 GPa while for mature wood it was 0.474 GPa. Statistically significant differences between the values were found. The reduced modulus of elasticity in juvenile wood was 14.0 GPa and 16.4 GPa in mature wood. Thus, the hardness values obtained were about 7% higher, while the modulus of elasticity was 17% higher in mature wood. All determinations were made in the S2-layer of the secondary cell wall.

Variation in the microfibril angle in annual rings of pine wood with developed reaction tissue

71%

Fabisiak E. , Kudela J. , Mania P. , Molinski W.

tom 82

A study on the dependence between tracheid lengths and microfibril angle in resonant wood of spruce (Picea abies L.)

71%

Fabisiak E. , Molinski W. , Kudela J. , Mania P.

tom 77

The paper presents results of measurements for tracheid lengths in annual growth rings in spruce wood classified as resonant wood. Annual rings came from the mature wood zone. Moreover, cellulose microfibril angle (MFA) was determined in the S2 layer of the secondary cell wall. This parameter was measured in tangential tracheid walls. Mean values of both tracheid lengths and MFA in the experimental annual growth rings showed slight fluctuations and the relationship of these values was described using a linear function.

Badania związku pomiędzy długością cewek a kątem nachylenia mikrofibryl w rezonansowym drewnie świerku (Picea abies L.). W pracy przedstawiono wyniki pomiarów długości cewek w przyrostach rocznych świerku, zaklasyfikowanego jako drewno rezonansowe. Zmierzono także kąt nachylenia mikrofibryl w stycznych ścianach cewek. Do badań wybrano 10 przyrostów rocznych ze strefy drewna dojrzałego. Zależność pomiędzy analizowanymi wielkościami, na badanym odcinku promienia drzewa, opisano funkcją liniową.

Investigation of Modal Behaviour of Resonance Spruce Wood Samples (Picea abies L.)

71%

Mania P. , Fabisiak E. , Skrodzka E.

tom Vol. 42, No. 1

23--28

Results of experimental modal analysis of a resonance and non-resonance spruce wood (Picea abies L.) are presented. The resonance wood came from a tree from Poland and Bosnia and Herzegovina, while the non-resonance wood came from the vicinity of Olsztyn from the north-eastern Poland. The modal parameters (modal frequency, modal damping and mode shapes) of the wood samples were determined for the samples of 8 mm in thickness. Modal analysis was made by pulse excitation. The resonance and non-resonance wood differ in the fundamental modal parameters as well as in the number of potential modes. Additionally, calculated values of damping factor are presented. The values are much bigger for a non-resonance wood than for good quality resonance spruce.

Variation in tracheid lengths in resonance wood of spruce (Picea abies L.)

71%

Fabisiak E. , Mania P. , Kudela J.

2014

tom 86