Elastic properties of compressed spruce with respect to its cross section obtained under various compression ratios
2007
We examined the elastic properties of Sitka spruce (Picea sitchensis Carr.) compressed wood with respect to its cross section. Using specimens with various compression ratios, tension tests were conducted for measuring Young's modulus in the radial and tangential directions and Poisson's ratio on the cross section, whereas asymmetric four-point bending tests were conducted for measuring the shear modulus on the cross section. The results are summarized as follows: (1) Young's modulus in the radial direction decreased with increasing the compression ratio, whereas that in the tangential direction showed the converse tendency. (2) Poisson's ratio decreased with increasing the compression ratio. (3) The shear modulus was maximum at the compression ratio of 60 percent.
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