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首页> 外文会议>International Symposium on Nondestructive Testing of Wood; 20000913-20000915; Sopron; HU >Through-Thickness Ultrasonic Transmission Properties of Oriented Strandboard
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Through-Thickness Ultrasonic Transmission Properties of Oriented Strandboard

机译：定向刨花板的全厚度超声波传输特性

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摘要

Voids are inherent in the manufacture of structural oriented strandboard (OSB) due to imperfection of processing and intrinsic material parameters. The presence of voids in OSB creates in-plane density variation, which reduces the elastic moduli and affects dimensional stability of OSB. Thus, quality improvement of OSB depends largely on reduction of the amount of embedded voids. Since voids are strong scatters of elastic wave, an attempt is made in this study to correlate ultrasonic transmission properties to internal void structure and panel strength of OSB. A through-thickness ultrasonic transmission in laboratory-made OSB panels was done by a direct-contact (using Panametrics PR5058 with 100 kHz transducers and silicon gel coupling) and a non-contact (using SecondWave NCA1000-2E analyzer with NCT102-250 kHz transducers) ultrasonic systems. The density spectrum of the specimens ranged from 465 to 1400 kg/m~3 provided the significant variable influencing the ultrasonic transmission parameters. Direct contact measurements led higher velocity values than those non-contact for a given board type. The UT properties-density models for boards at the 4% resin content showed rather consistent patterns, whereas those for 6% resin content boards showed erratic trends. Both bending stiffness and breaking resistance correlated linearly with velocity and RMS. Both methods produced comparable and consistent attenuation and RMS responses to density particular to each system, which reflect the material characterization phenomena due to processing variables made at various density, resin, and flake alignment levels. This on-going study demonstrates the frontal capability of using an ultrasonic-based system in developing an on-line quality monitoring system in OSB production.
机译：由于工艺和固有材料参数的不完善，空隙在结构定向刨花板（OSB）的制造中是固有的。 OSB中空隙的存在会产生面内密度变化，从而降低弹性模量并影响OSB的尺寸稳定性。因此，OSB的质量提高很大程度上取决于减少嵌入空隙的数量。由于空隙是弹性波的强散射体，因此在本研究中尝试将超声波传输特性与OSB的内部空隙结构和面板强度相关联。通过直接接触（使用带有100 kHz传感器和硅胶耦合的Panametrics PR5058）和非接触（使用带有NCT102-250 kHz传感器的SecondWave NCA1000-2E分析仪）在实验室制造的OSB面板中进行全厚度超声波传输）超声系统。样品的密度谱范围在465至1400 kg / m〜3之间，这是影响超声传输参数的重要变量。对于给定的板类型，直接接触测量导致的速度值高于非接触测量。树脂含量为4％的板材的UT特性密度模型显示出相当一致的图案，而树脂含量为6％的板材的UT特性密度模型则显示出不稳定的趋势。弯曲刚度和抗断裂性均与速度和RMS线性相关。两种方法对每个系统所产生的密度均产生可比较且一致的衰减和RMS响应，这反映了由于在各种密度，树脂和薄片排列水平下产生的加工变量而引起的材料表征现象。这项正在进行的研究证明了使用基于超声波的系统开发OSB生产在线质量监控系统的前沿能力。

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