Determination of Variation of Strain Anisotropy of Wood due to change in Relative Humidity

Authors

  • Kalita K Dept. of Instrumentation & USIC Gauhati University
  • Das N Dept. of Instrumentation & USIC Gauhati University

Keywords:

MPLAB-IDE, RISC Processor, Measurement System

Abstract

Wood is an anisotropic biological material with a multitude use. The paper describes variation of strain of wood samples due to the change in relative humidity (RH). The strain developed due to change in RH is measured by strain gauge method. In this paper, the strain is measured in longitudinal (L) and tangential (T) direction. For that purpose strain gauge is attached in the prescribed direction and the strain developed due to change in RH is recorded by data acquisition system. The developed data acquisition recorded ambient temperature, RH with temperature compensated and strain of the wood samples in different L and T direction. Strain anisotropies of two wood samples of different thickness are tested at different relative humidity conditions and the results are reported in the paper. Experimental results show that the strain developed in the wood sample is anisotropic.

References

GTR-FPL-I13.USDA Forest Service Wood Handbook:Wood as an Engineering Material., Forest Product Laboratory, (1999) Madison

Kollmann F.F.P, Cote W.A, Principles of wood science and technology I solid wood, Springer-Verlag(1968), New York Inc.

Eckelman A,The shrinkage and swelling of wood and its effects on furniture, Forestry & natural resources, FNR 163, Purdue University,Cooperative extension service West Lafayette IN

Rafsanjani A, Stiefel M, Jefimovs K, Mokso R, Derome D, Carmeliet J, Hygroscopic swelling and shrinkage of latewood cell wall micropillars reveal ultrastructural anisotropy. Journal of the Royal society interface, (2014) ,11:95

Dahl KB, Malo KA, Planar strain measurements on wood specimens, Experimental Mechanics (2009), 49:575–586

Derome D, Rafsanjani A, Patera A, Guyer R, Carmeliet J,Hygromorphic behavior of cellular material: hysterectic swelling and shrinkage of wood probed by phase contrast X- ray Tomography. Philosophical Magazine, (2012) 92:28-30

Hering S, Kennecke D, Niemz P, Moisture-dependent orthotropic elasticity of beech wood, Wood Sci Technol (2011) , DOI 10.1007/s00226-011-0449-4

Kalita K, Das N, Sarma U, Boruah PK, Development of a strain measurement system for the study of effect of relative humidity on wood, Measurement Journal(2016), 94:265-272

IST innovative sensor technology, Tsic 506F TO 92, accessed on 2nd August, 2015

Honeywell, HIH-5030, accessed on 1st August, 2015

Datasheet of strain gauge, accessed on 12th June, 2015

Kalita K, Das N, Sarma U, Boruah PK, Design and uncertainty evaluation of a strain measurement system, MAPAN-Journal of Metrology Society of India,Springer(2015), 31: 17-24

Wiederhold PR Water vapor measurement: Methods and Instrumentation, CRC Press, (1997),

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Published

2025-11-11

How to Cite

[1]
K. Kalita and N. Das, “Determination of Variation of Strain Anisotropy of Wood due to change in Relative Humidity”, Int. J. Comp. Sci. Eng., vol. 4, no. 7, pp. 80–84, Nov. 2025.