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Studies on the nondestructive test of wood and its application to the grading system

木材无损检测及其在分级系统中的应用研究

基本信息

批准号：
63302060
负责人：
OKUMA Motoaki
金额：
$ 2.56万
依托单位：
The University of Tokyo
依托单位国家：
日本
项目类别：
Grant-in-Aid for Co-operative Research (A)
财政年份：
1988
资助国家：
日本
起止时间：
1988 至 1989
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-63302060/
关键词：
Proof loading Dynamic test Stress wave Sound analysis Acoustic emission Image analysis Log Structural wood 製造用木材非破壊検査強度等級区分建築用木材国産材乾燥

项目摘要

An effective nondestructive test is strongly necessary to develop the grading system of the structural members (sawn lumber or wood-based materials) in the wood construction. In this study, several kinds of nondestructive tests were applied to the wooden materials to investigate the possibilities and the conditions as the testing method for the strength grading system.Results of the study are summarized as follows ; (1) Static bending by dead load, dynamic bending, stress wave and sound analysis tests were considered as nondestructive testing methods to get MOE of the specimen. Also, acoustic emission tests and image analysis method were taken up to inspect the defect of wood. The data from these tests will serve for the conservative visual inspection. (2) Every methods have their own limitations in the practical application to the structural grading of wood and the combination of these test methods seemed to be very effective. (3) Moisture content of the material has a great effect on the value of nondestructive test. So, a prediction method of moisture content was proposed. Moisture content can be calculated from the weight and the volume of wood by this system. (4) A plenty of data of MOE and MOR were provided from each forestry institutes, and the relationship between MOE and MOR was investigated. And then, this relation was analyzed in the way of reliability theory for its application to the strength grading system.

对木结构构件（锯材或木基材料）进行分级是非常必要的。本研究采用几种无损检测方法对木质材料进行检测，探讨其作为强度分级体系检测方法的可能性和条件。研究结果总结如下：(1)采用恒载静弯曲、动弯曲、应力波和声音分析等无损检测方法获得试件的MOE。采用声发射测试和图像分析方法对木材缺陷进行检测。这些试验的数据将用于保守的目视检查。(2)每种方法在木材结构级配的实际应用中都有其局限性，这些试验方法的结合似乎是非常有效的。(3)材料的含水率对无损检测的价值影响很大。为此，提出了一种预测含水率的方法。该系统可以根据木材的重量和体积计算出水分含量。(4)各林业研究所提供了大量的MOE和MOR数据，并对MOE和MOR之间的关系进行了研究。然后，用可靠性理论的方法分析了这种关系，并将其应用于强度分级系统。