Identification of Defective Joints in Beams via Torsional Vibration

IF 0.7 4区农林科学 Q4 MATERIALS SCIENCE, PAPER & WOOD

Drvna Industrija Pub Date : 2022-11-15 DOI:10.5552/drvind.2022.2132

M. Kohantorabi, A. Asgari, Mona Shayestehkia, Mobina Kohantorabi

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引用次数: 0

Abstract

The determination of the shear dynamic modulus in wood product panels is of greater importance than its determination in wood beams. Yet with regards to the effect of defects on the obtained values of shear modulus, this factor is used to detect the defects and the degree of the defects. In this study, the effect of gluing defects in two joint shapes (scarf (45°) and finger joints (10 mm length and 3 mm pitch) were evaluated non-destructively using the torsional vibration method. Rectangular wood specimens with dimensions of 20 mm × 40 mm × 360 mm (R × T × L) were prepared from clear eastern beech. The joints were located at similar positions in the middle of the beams. The results showed that creating a healthy joint did not significantly change the values obtained for the shear modulus in either of the joint shapes. However, reducing the adhesion level in both types of joints caused a significant reduction in the shear modulus values. The results show that the changes in the dynamic shear modulus values in both joint types, as a result of changes in the glue coverage rating (fully, medium and low-glued joints) allows the detection of the defects as well as the degree of the defects.

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基于扭转振动的梁缺陷节点识别

木制品板材中剪切动态模量的测定比木梁中剪切动态模数的测定更重要。然而，关于缺陷对获得的剪切模量值的影响，该因子用于检测缺陷和缺陷的程度。在本研究中，使用扭转振动方法无损评估了两种接头形状（围巾（45°）和手指接头（10 mm长和3 mm节距）的胶合缺陷的影响。用透明的东方山毛榉制备了尺寸为20mm×40mm×360mm（R×T×L）的矩形木材试样。接缝位于梁中间的类似位置。结果表明，创建健康的接头不会显著改变任何一种接头形状中获得的剪切模量值。然而，降低两种类型接头的粘合水平会导致剪切模量值显著降低。结果表明，由于胶水覆盖率的变化（完全、中等和低胶合接缝），两种接缝类型的动态剪切模量值的变化允许检测缺陷以及缺陷的程度。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Drvna Industrija MATERIALS SCIENCE, PAPER & WOOD-

CiteScore

1.80

自引率

9.10%

发文量

审稿时长

>12 weeks

期刊介绍： "Drvna industrija" ("Wood Industry") journal publishes original scientific and review papers, short notes, professional papers, conference papers, reports, professional information, bibliographical and survey articles and general notes relating to the forestry exploitation, biology, chemistry, physics and technology of wood, pulp and paper and wood components, including production, management and marketing aspects in the woodworking industry.