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Variation of Physical and Mechanical Properties of Calamus Erectus

M.F. Kabir
Research Officer (Ex)
Seasoning and Timber Physics Division, Bangladesh Forest Research Institute, Chittagong.

M. A. Sattar
Seasoning and Timber Physics Division, Bangladesh Forest Research Institute, Chittagong.

D. K. Bhattacharjee
Seasoning and Timber Physics Division, Bangladesh Forest Research Institute, Chittagong.

Abstract/ Executive Summary:

The physical characteristics, physical and mechanical properties of Calamus erectus have been studied at three height positions. The variation of physical properties due to node and internode have also been investigated. The moisture content and shrinkage increase, whereas the specific gravity decreases with the height of the stem. The specific gravity is higher at the node than that at the internode. The bottom portion is stronger in respect of compressive strength, bending strength, nail withdrawal and side hardness.

Keywords: Physical and mechanical properties, Calamus erectus, Height positions, Node and internode

Location:

Start Date: 00-00-0000

End Date: 00-00-0000

Program Area: Conservation and Biodiversity

Commodity: Tree

Objectives:

To evaluate the properties of Calamus erectus which is the largest diameter rattan in Bangladesh.

Methodology:

The stems of mature Calamus erectus were collected from the forest of Sitkunda hill of Chittagong. The maturity of the stem were determined by loosening of the leaf sheath and exposed stem at the lower portion of the stem. Three rattan stems were taken for this study and each stem was divided into three equal portions – bottom, middle and top. Three samples were taken for the physical properties from the middle of the internode and the consecutive node of each portion. Two specimens were taken from each portion for mechanical properties, one for test in green condition and the other for the test in air dry condition. The length of the specimens for compressive test was of four times of the average diameter. The static bending test was carried out according to the ASTM standard with a minor modification. The hardness and nail withdrawal was determined at the side of the stem in green and air dry conditions.

Source of Information: Bangladesh Journal of Forest Science, Vol : 23 (2), July-Dec 1994, 43-47

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

The internode length and diameter of Calamus erectus decreased along the culm height. The bottom portion had a lower moisture content, volumetric shrinkage and diameter shrinkage with a higher specific gravity. The specific gravity was higher at the node than that at the internode. The maximum strengths were observed in the bottom of the stem. The species is suitable for use as framing of the furniture requiring larger diameter and higher strength.

Knowledge Management: Journal