Teixeira D E, Moslemi A
Laboratório de Produtos Florestais-LPF/IBAMA, Brasília-DF, Brazil.
Bioresour Technol. 2001 Sep;79(2):193-8. doi: 10.1016/s0960-8524(01)00038-4.
This study evaluates whether the mechanical properties of modulus of rupture (MOR) and modulus of elasticity (MOE) of wood-fiber cement (WFC) sheets are correlated with the nondestructive parameters of stress wave velocity and density of the material. Longitudinal stress wave technique was used to evaluate WFC nondestructively using a total of 117 specimens (measuring each 241 x 51 mm) obtained from 39 WFC sheets. The aim was to establish the correlation between dynamic versus static MOE of the material for predicting the actual mechanical property. Even though short dimension specimens were used, results obtained were encouraging. A correlation coefficient (R) of 0.828 was found when the static MOE of the material was used as a function of nondestructive parameters. A multivariate linear regression analysis using the specimen's density, wave velocity, and dynamic MOE provided the strongest correlation to the static MOE. The correlation observed for MOR as a function of static MOE is within the normal range obtained for wood composites. A nondestructive evaluation (NDE) using full size WFC sheets is recommended and can probably improve the relationship between the static and the predicted MOE.
本研究评估了木纤维水泥（WFC）板的断裂模量（MOR）和弹性模量（MOE）的力学性能是否与材料的应力波速度和密度等无损参数相关。使用纵向应力波技术对WFC进行无损评估，共使用了从39张WFC板中获取的117个样本（每个样本尺寸为241×51毫米）。目的是建立材料动态与静态MOE之间的相关性，以预测实际力学性能。尽管使用的是短尺寸样本，但获得的结果令人鼓舞。当将材料的静态MOE作为无损参数的函数时，发现相关系数（R）为0.828。使用样本的密度、波速和动态MOE进行多元线性回归分析，与静态MOE的相关性最强。观察到的MOR与静态MOE的函数关系处于木材复合材料的正常范围内。建议使用全尺寸WFC板进行无损评估（NDE），这可能会改善静态与预测MOE之间的关系。
