Quality and utilization of sugi [Cryptomeria japonica]-wood in Takakuma University Forest [Japan], 5: The relations between specific gravity and mechanical properties of Obiarakawa-sugi-wood

Fujita, S. . Faculty of Agriculture

Quality and utilization of sugi [Cryptomeria japonica]-wood in Takakuma University Forest [Japan], 5: The relations between specific gravity and mechanical properties of Obiarakawa-sugi-wood

1990

Fujita, S. (Kagoshima Univ. (Japan). Faculty of Agriculture)

In this paper, some fundamental properties of plantation growing in "Obiarakawa-sugi-wood (Cryptomeria japonica)" were investigated. Three representative "Obiarakawa-sugi-wood" trees having 23cm to 27cm diameter breast height (28 year old) were selected as the materials for analyzing the stem and for investigating some physical and mechanical properties. The measurements of mechanical properties were performed, based on Japanese Industrial Standard (JIS); specimens were obtained continuous along the direction of stem diameter from one sap-wood to another. The following mechanical properties were put under testings. 1) Bending test (a test carried out for the ascertainment of the bending strength and modulus of elasticity in bending). 2) Impact bending test (a test to ascertain the absorbed energy in impact bending). 3) Compressive test (a test to ascertain the compressive strength parallel to grain). 4) Shearing test (a test to ascertain the shearing strength in tangential and radial planes). 5) Cleavage test (a test to ascertain the cleavage resistance in tangential and radial planes). The main results are as follows: 1. The specific gravity and average ring width ranged from 0.28 to 0.67 (Ave. 0.37), from 0.15cm to 2.81cm (Ave. 0.98cm), respectively. 2. The mechanical properties of plantation-grown Obiarakawa-sugi-wood growing in the form of plantation at Takakuma field in Kagoshima University Forest was almost the same as that Satsumameasa-sugi-, Kumotoushi-sugi- and Yoshino-sugi-woods in the same field

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