Relationship between acoustic wave velocity and mechanical properties in Acacia mangium wood

Doan Van Duong, Masumi Hasegawa
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Abstract

There is a strong interest in developing and using acoustic technology to evaluate the mechanical properties of wood in situations where a static bending test is not feasible to undertake. In this study, the mechanical properties of Acacia mangium (black wattle) wood were predicted by using stress wave and ultrasonic wave methods. The values of dynamic modulus of elasticity based on stress wave and ultrasonic wave were 9,29 % and 4,75 % higher than those obtained from static modulus of elasticity, respectively. There was no statistically significant correlation between acoustic velocity and mechanical properties measured by destructive tests. The strong experimental correlation coefficients were found between stress wave and modulus of elasticity (r = 0,94; P < 0,001), and ultrasonic wave and modulus of elasticity (r = 0,83; P < 0,001). This result indicates that stress wave and ultrasonic wave techniques are suitable for predicting the static modulus of elasticity of Acacia mangium (black wattle) wood if the density of the measured elements is known. There was no dependence of wood density and acoustic propagation velocity measured in this study, whereas statistically significant correlations were found between the fiber length with stress wave velocity (r = 0,44; P < 0,05) and ultrasonic velocity (r = 0,48; P < 0,05).
芒果相思木的声波速度与机械特性之间的关系
在无法进行静态弯曲试验的情况下,人们对开发和使用声学技术来评估木材的机械特性有着浓厚的兴趣。在这项研究中,使用应力波和超声波方法预测了相思树(黑荆条)木材的机械特性。根据应力波和超声波得出的动态弹性模量值分别比根据静态弹性模量得出的数值高出 9.29 % 和 4.75 %。声速与破坏性试验测得的机械性能之间没有明显的统计学相关性。在应力波和弹性模量(r = 0.94;P < 0.001)以及超声波和弹性模量(r = 0.83;P < 0.001)之间发现了很强的实验相关系数。这一结果表明,如果已知测量元素的密度,应力波和超声波技术适合预测黑刺槐木材的静态弹性模量。本研究中测得的木材密度与声波传播速度没有相关性,而纤维长度与应力波速度(r = 0.44;P < 0.05)和超声波速度(r = 0.48;P < 0.05)之间存在统计学意义上的显著相关性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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