横向振动方法评估大尺寸规格材静态抗弯弹性性质

该文通过比较大尺寸规格材动态和静态弹性模量之间的相互关系，探讨利用横向振动方法预测大尺寸板材抗弯弹性性质的可行性. 根据ASTM D198-99和ASTM D4761-96标准分别测定了加拿大针叶树商品材云杉-松-冷杉类大尺寸规格材 (38 mm×89 mm×3 658 mm) 的静态抗弯弹性模量E1和E2，并通过横向振动无损检测设备得到的动态弹性模量Etv对静态测试结果进行预测. 试验结果显示，横向振动方法得到的动态弹性模量Etv的平均值最大，比静态抗弯弹性模量E1和E2的平均值分别高5%(0.56 GPa)和15% (1.46 GPa). 动态弹性模量Etv与静态载荷方法测得的E1和E2都具有很好的相关性，相关系数分别为0.853 和0.881，均在0.01水平上呈显著相关. 该研究表明，横向振动方法能够快速准确地预测大尺寸规格材的静态抗弯弹性性质，是一种具有发展潜力的无损检测评估技术. 

Evaluating static bending elastic properties of full_size lumbers by using transverse vibration method.

The possibility of a non-destructive transverse vibration technique was studied to evaluate static bending elastic properties of full_size lumbers. Sixty-two commercial spruce,pine and fir lumbers (38 mm×89 mm×3 658 mm) from North American were selected for modulus of elasticity (MOE) tests. The dynamic MOE and two static MOE of each lumber, based on transverse vibration (Etv), four-point bending test of ASTM -D198-99 (E1) and ASTM D4761-96 (E2) respectively, were measured under an air dried condition. The results indicated that the average Etv was 5% (0.56 GPa) greater than E1 and 15% (1.46 GPa) greater than E2Statistical linear regression analyses revealed that significant relationships were evident among dynamic and static elastic properties (at the level of 0.01). The correlation coefficient was 0.853 between Etv and E1, and 0.881 between Etv and E2Therefore, it can be concluded that the non-destructive transverse vibration technique can be applied to predict static properties of full_size lumber and provide an indication of the potential for the wood quality evaluation.