柳杉木材物理力学性质研究

对20和30年生的柳杉木材物理力学性质进行了测定和分析,测定指标主要包括密度、干缩性、湿胀性、吸水性、顺纹抗压强度、横纹抗压强度、抗弯强度、抗弯弹性模量和冲击韧性。结果表明,柳杉木材的基本密度、气干密度、全干密度、生材密度分别为0.408 0、0.503 0、0.464 0和1.002 0 g/cm3,属小级别;其差异干缩为1.688 0,中等级别;顺纹抗压强度为43.200 MPa,横纹径向和弦向全部抗压强度分别为0.408和0.565 MPa,抗弯强度和抗弯弹性模量分别为88.200和9 505.0 MPa,冲击韧性为41.000 kJ/m2,除横纹抗压强度较低外,其余力学强度指标均属低级别;木材综合品质系数为3 221×105 Pa,品质系数较高,属高等级材。

Studies on the Physical-mechanical Properties of Cryptomeria fortunei Hooibrenk Woods

The physical-mechanical properties of 20-year-old and 30-year-old Cryptomeria fortunei Hooibrenk woods were measured from their density,drying shrinkage,wetting swelling,water absorbing capacity,compressive strength parallel to grain,compressive strength perpendicular to grain,bending strength,modulus of elasticity and toughness.The results showed that the basic density,air-dried density,oven-dried density and green density were respectively 0.408 0,0.503 0,0.464 0 and 1.002 0 g/cm3,belonging to the low level;the differential drying shrinkage was 1.688 0,belonging to the middle level;the compressive strength parallel to grain was 43.200 MPa,the compressive strength perpendicular to grain on radial and tangential surfaces were respectively 0.408 and 0.565 MPa;the bending strength and modulus of elasticity were 88.200 and 9 505.0 MPa,the toughness was 41.000 kJ/m2.Except the compressive strength perpendicular to grain,other mechanical intensity of C.fortunei Hooibrenk belongs to the low level.The comprehensive quality coefficient of this wood was 3 221×105 Pa,proving that it is of high quality.