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首页> 外文会议>International Symposium on Nondestructive Testing of Wood; 20000913-20000915; Sopron; HU >The study of sound propagation in the wood-based composite materials
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The study of sound propagation in the wood-based composite materials

机译：木质复合材料中声音传播的研究

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摘要

For the study of sound propagation in several types of wood-based composite materials (WBCM) two different non-destructive testing methods were applied. Resonance frequency and sound velocity were applied on boards (particleboards, OSB, MDF) of industrial production. Each type of board was evaluated by measuring the sound velocity both parallel and perpendicular to the direction of production. In addition, sound velocity through the thickness of the board was measured. The elastic and mechanical characteristics of properties, as determined by resonance frequency and sound velocity were compared with those determined by static method. The used frequencies were 50, 100 and 200 kHz. We also studied an influence of some variables such as specimen's width (20 to 200 mm) and.thickness (16 to 96 mm) on the sound velocity for particleboards. It was shown that the sound velocity decreases in general with increases in specimen's thickness and width. By increasing of the relative air humidity (from 50 to 90%) and temperature (from minus 35° to +70℃) of board we found a decrease of the sound velocity. The measurement of seven types of particleboards (with different density and thickness) brought different sound velocity for all board types.
机译：为了研究几种类型的木质复合材料（WBCM）中的声音传播，应用了两种不同的无损测试方法。共振频率和声速应用于工业生产的木板（刨花板，OSB，MDF）上。通过测量平行于和垂直于生产方向的声速来评估每种类型的木板。另外，测量了穿过板厚度的声速。将通过共振频率和声速确定的特性的弹性和机械特性与通过静态方法确定的特性进行比较。使用的频率为50、100和200 kHz。我们还研究了一些变量（例如试样的宽度（20至200 mm）和厚度（16至96 mm））对刨花板声速的影响。结果表明，声速通常随着样品厚度和宽度的增加而降低。通过增加木板的相对空气湿度（从50％到90％）和温度（从负35°到+ 70℃），我们发现声速降低了。七种类型的刨花板（密度和厚度不同）的测量结果为所有类型的刨花板带来了不同的声速。

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