Quantitative Characteristics of Local Strain Fields in a Top-Liner Board Sample under Uniaxial Tension

Journal Title: Lesnoy Zhurnal (Russian Forestry Journal) - Year 2020, Vol 10, Issue 1

Abstract

The paper presents the method for quantifying the distribution of local tensile (longitudinal), compressive (transverse) and shear strains in a sample of pulp and paper material. The results of its use for the sample of top-liner board when uniaxial tensile testing are provided. Applying this method, we have determined the values, the degree of heterogeneity and change patterns of local strains in inhomogeneous and anisotropic structure of the sample, depending on the total strain and the direction of fiber orientation. The method is based on constant-speed tensile testing of samples with a pre-applied dot matrix to their surface. The test is accompanied with photo fixing and recording a load-elongation curve. The coordinates and displacements of dots are determined by means of the specially designed software. The analysis of data and calculation of local deformations are performed by finite elements method (FEM) algorithms. The outcomes have shown that the local longitudinal deformations increased, transverse – decreased, and shear – had their maximum at 45° to machine direction (MD) when increasing the angle of preferential fiber orientation to MD in the board samples. The rise of the average absolute values of all components of local strains when increasing total deformation in the sample was confirmed. As it has been found, the heterogeneity of local strains, estimated through the standard deviation, rose when increasing their absolute value; the trends of changing depend on the fiber orientation direction in the sample structure.

Authors and Affiliations

A. N. Romanova, Ya. V. Kazakov, A. V. Malkov

Keywords

Related Articles

Formation of Biologically Stable Protective Pine Forests by Improvement Thinning in Northern Kazakhstan

The article deals with the effect of thinning in a permanent trial plot (PTP). The objects of care were natural clean even-aged pine forests growing in arid conditions of the Kazakh Uplands (case study of the Burabay Nat...

Physical and Chemical Soil Properties of Mangrove Forests in Vietnam

Recently the area of mangrove (evergreen) forests growing along the coast of Vietnam has been significantly increased by artificial afforestation under the recognition of their ecological role and economic importance. Pr...

GIS-analysis of the Influence of the Land Use Type on the Current Diversity of Forest Plantations in the Kenozersky National Park

The problem of agricultural land abandonment is a worldwide problem. In the forest zone, the transformation of fallow lands is associated with afforestation and the formation of so-called secondary forest growths. Postag...

Update on the Boundaries of the Curly Birch Range

Russian forest sector forms an attractive market for harvesting and logging equipment, however the position of Russian manufacturers is extremely weak. A brief overview of the current state of the market is presented wit...

Hydrocarbons and Ethers of Extractive Substances of Siberian Larch Needles

Siberian larch (Larix sibirica L.) is the main commercial species in Russia. Currently, larch woody greens are underutilized. They are considered a waste product from logging. This is due to the lack of knowledge on the...

Download PDF file
  • EP ID EP683252
  • DOI 10.37482/0536-1036-2020-1-180-189
  • Views 518
  • Downloads 0

How To Cite

A. N. Romanova, Ya. V. Kazakov, A. V. Malkov (2020). Quantitative Characteristics of Local Strain Fields in a Top-Liner Board Sample under Uniaxial Tension. Lesnoy Zhurnal (Russian Forestry Journal), 10(1), -. https://www.europub.co.uk/articles/-A-683252