Twelve Elastic Constants of Betula platyphylla Suk.

编号 zgly0000327895

文献类型 期刊论文

文献题名 Twelve Elastic Constants of Betula platyphylla Suk.

学科分类 220.5540;木材学

作者 WangLiyu  LuZhenyou 

作者单位 CollegeofMaterialScienceandTechnology 

母体文献 中国林学: 英文版 

年卷期 2004,6(1)

页码 37-41

年份 2004 

分类号 S781.23 

关键词 弹性  常数  木材  电子测量  桦属植物 

文摘内容 Wood elastic constants are needed to describe the elastic behaviors of wood and be taken as an important design parameter for wood-based composite materials and structural materials. This paper clarified the relationships between compliance coefficients and engineering elastic constants combined with orthotropic properties of wood, and twelve elastic constants of Betula platyphylla Suk. were measured by electrical strain gauges. Spreading the adhesive quantity cannot be excessive or too little when the strain flakes were glued. If excessive, the glue layer was too thick which would influence the strain flakes' performance, and if too little, glues plastered were not firm, which could not accurately transmit the strain. Wood as an orthotropic material, its modulus of elasticity and poisson's ratios are related by two formulas:μij/Ei=μji/Ej and μij<(Ei/Ej)^1/2. The results showed that the elastic constants of Betula platyphylla Suk. measured by electrical strain gauges were accurate and reliable. The results of shear elastic modulus GTL and GLR show a high linear regression correlation coefficient (>0.95) between the reciprocal of elastic modulus MOE^-1 and the square of the ratio of depth to length (h/l)^2, which indicate that shear modulus values measured were reliable by three point bending experiment。