Affordable Access

Access to the full text

Degradation of Mechanical Properties of Pine Wood Under Symmetric Axial Cyclic Loading Parallel to Grain

Authors
  • Stanciu, Mariana D.
  • Teodorescu, Horațiu D.
  • Vlase, Sorin
Type
Published Article
Journal
Polymers
Publisher
MDPI AG
Publication Date
Sep 23, 2020
Volume
12
Issue
10
Identifiers
DOI: 10.3390/polym12102176
PMID: 32977665
PMCID: PMC7598592
Source
PubMed Central
Keywords
Disciplines
  • Article
License
Green

Abstract

The mechanical properties of wood, respectively the elastic, plastic, and strength properties, depend on a large number of factors, due both to its structural and physical characteristics, as well as to the size, direction, nature, and speed of application of forces. Wood, generally considered to be a viscous-elastic material, has creep deformations over time under the effect of a constant load. In this study the behavior of pine wood samples was investigated due to its large utilization in different finished products, such as roof construction, furniture, outdoor applications, garden furniture, and toys. The paper aims to analyze the viscoelastic behavior of pine wood subjected to cyclically loading to traction-compression with different loads (1 kN; 1.5 kN; 2 kN), applied at different speeds (1 mm/min; 10 mm/min). It was observed that, at low speeds (1 mm/min) and low intensities of the applied force, it was possible to distinguish the three creep regions specific to wood: the primary area (primary flow), the secondary area, and finally the tertiary creep. As the force increases, the law of variation of the wood flow changes. The degradation of longitudinal elasticity modulus occurs with the increase of the number of cycles, so after 20 alternating symmetrical cycles of traction-compression of the pine wood samples, there is a decrease of its values by 35%.

Report this publication

Statistics

Seen <100 times