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首页> 外文会议>International symposium on nondestructive testing of wood >'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：“NDT通过使用超声技术和特定的木材测试仪确定劣化木材的强度损失”

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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：面对木结构恢复的问题，对腐木诊断的最重要的步骤之一是确定的材料的强度的损失，以接近的值被认为对于在服务结构部件的设计。我们通过使用多个NDT设备，其中以组合的方式使用开发了一套系统，可用于该目的。其中一种无损检测方法包括对超声技术的有效性以确定木材的，其强度的衰减的影响，通过用不同的损失重量的2,5至25％的探针装置。另一种方法是基于使用渗透测试仪，Hlodyn，用于木材的测试的特定设备。开发的研究倾向于确定使用两个系统中提供足够的信息及的一种腐朽的木结构构件的强度损失。测试一大批的人做了有效的方法，其放入关系与探针的抗压强度。这些测试是在三个样品的木材做了，在古建筑的更多的使用。探针分别为4×15×3厘米（轴向方向），空气干燥，并没有缺陷。有人认为，为好，水分含量和比重的影响。三种不同的文章被开发出来。用干净的声音木第一个系列，以确定其机械特性。第二系列，以确定水分含量和第三系列的影响建立重量探针的损失的孔的可变性，和直径。与NDT设备均完成了所有的文章之前提到，和抗压强度测定。

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