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首页> 外文会议>International Symposium on Nondestructive Testing of Wood; 20000913-20000915; Sopron; HU >'NDT determination of the strength loss of deteriorated wood, by using ultrasonic techniques and a specific wood tester'
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'NDT determination of the strength loss of deteriorated wood, by using ultrasonic techniques and a specific wood tester'

机译：“通过使用超声波技术和特定的木材测试仪，对损坏的木材的强度损失进行无损检测测定”

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摘要

Facing the problem of restoration of timber structures, one of the most important steps on the diagnosis of decayed wood is to determine the strength loss of the material, to approach to a value to be considered for the design of structural members in service. We have developed a system by using several NDT devices, which used in a combined way, may be useful for this purpose. One of these NDT methods consists on the validity of ultrasound techniques to determine the influence of the decay of wood in its strength, by means of probes with different loss of weight 2,5 to 25%. The other method is based on the use of a penetration tester, Hlodyn, a specific device for wood testing. The research developed tends to determine that the use of both systems provides enough information to approach to the loss of strength of a decayed timber structural member. A great number of tests were done to valid the method, which were put in relation with the compression strength of the probes. The tests were done in three specimens of wood, those more used in ancient buildings. The probes were 4 x 15 x 3 cm (axial direction), air dried and without defects. It was considered, as well, the influence of moisture content and specific gravity. Three different essays were developed. First series with clean and sound wood to determine its mechanical characteristics. Second series to determine influence of moisture content and third series to establish the variability of loss of weight of the probes, and diameter of holes. All the essays were done with the NDT devices referred before, and compressive strength determination.
机译：面对木材结构的修复问题，诊断腐朽的木材最重要的步骤之一就是确定材料的强度损失，以达到在役结构构件设计所要考虑的值。我们已经通过使用几种无损检测设备开发了一种系统，这些设备可以组合使用，对于此目的可能是有用的。这些无损检测方法之一是依靠超声波技术的有效性，该技术通过使用重量损失在2.5％至25％之间的不同重量的探针来确定木材衰变对其强度的影响。另一种方法是基于渗透测试仪Hlodyn的使用，Hlodyn是用于木材测试的专用设备。开展的研究倾向于确定这两种系统的使用都提供了足够的信息来解决木质结构构件的强度损失。为了验证该方法的有效性，进行了大量测试，这些测试与探针的抗压强度有关。测试是在三个木材标本中完成的，这些标本更多地用于古代建筑。探针为4 x 15 x 3 cm（轴向），风干且无缺陷。还考虑了水分含量和比重的影响。撰写了三篇不同的论文。第一个系列采用清洁，无害的木材确定其机械特性。第二个系列确定水分含量的影响，第三个系列确定探针重量损失和孔直径的变化。所有论文均使用之前提到的NDT设备和抗压强度确定。

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