WOOD RESEARCH Volume 69, Number 3, 2024
CHUMIN CHEN, MING LI, SAIYIN FANG, JIALONG ZHAO, XIN ZHANG, FANGYONG LU, TINGTING DENG, and BO ZHANG

STUDY OF STRESS WAVE PROPAGATION PATH AND DEPTH IDENTIFICATION IN CRACKED WOOD BASED ON ACOUSTIC EMISSION AND COMSOLSIMULATION

The propagation velocity models were built using AE sensors to capture stress wave on pine specimen surface.On the different specimens, cracks were made in different numbers and the depth was gradually increased from 0 mm to 90 mm at 10 mm intervals. AE experiment was combined with COMSOL to investigate propagation path.The results show that R-squared is 0.996 when fitting tangent of angle to propagation velocity.At smaller crack depths, stress wave is diffracted around crack tip and then continues to propagate in to sensor along a straight line.However, as the crack depth increases, the reflected wave at the end face will arrive at the detection location faster with significantly weaker diffraction.The area with dimensions of20×10 mm was identified about the crack tip by crack identification method

WOOD RESEARCH Volume 69, Number 2, 2024
MARTINA VOJNIĆ PURČAR, LJILJANA KOZARIĆ, SMILJA BURSAĆ, and ŽIKICA TEKIĆ

A NUMERICAL MODEL FOR ANALYZING CROSS LAMINATED TIMBER UNDER OUT OF PLANE LOADING

This paper targets the validity of a novel numerical model for analyzing CLT under out of plane loading. This numerical model was initially developed for determining the shear lag effect that appears in laminated thin walled composite beams. A parametric study was conducted in order to determine the influence of orientation of layers in CLT panels on bending strength and deflection. For confirming the accuracy of the proposed model, the results from the numerical model are compared with the external results of the computer software Ansys. The differences in bending stress vary from 0.27% to 1.69% depending on the orientation of layers and for deflection the differences are ranged from 2.25% to 7.42%. A numerical study was conducted and obtained data corresponds to results obtained from experimental study. It was concluded that the proposed numerical method can enough precisely predict the behavior of CLT under out of plane loading

WOOD RESEARCH Volume 61, Number 2, 2016
Qing Ke, Lin Lin, Shaoyu Chen, Fan Zhang, and Yachi Zhang

Optimization of L-shaped corner dowel joint in pine using finite element analysis with Taguchi method

The strength of the furniture corner-joints in pine remains unknown, and the lack of information restricts its use in furniture industry. Therefore, the aim of this study is to optimize the strength of L-shaped corner dowel joint in pine under compression loads using finite element analysis (FEA) with Taguchi method. By adopting a L9-34 Taguchi orthodoxy array (OA), four experiment factors (i.e., structure style, tenon length, tenon diameter, and tenon gap), each at three levels, were carried out to determine the optimal combination of factors and levels for the von mises stress using ANSYS software. The results of Signal-to-Noise ratio (S/N) analysis and the analysis of variance (ANOVA) revealed that the optimal L-shaped corner dowel joint in pine is 45° Bevel Butt in structure style, 24 in tenon length, 6 in tenon diameter and 20 mm in tenon gap.

WOOD RESEARCH Volume 62, Number 6, 2017
Fu Yang and Fang Hai

Investigation of performance of recombinant bamboo chair through finite element technology

Recombinant Bamboo is a newly bamboo material which breaks through the traditional processing mode, and its excellent physical properties can fully replace the wood widely used in furniture manufacturing. In this paper, take the classic back chair for example, in order to research the application of recombinant bamboo material in the furniture, using ANSYS finite element analysis software to compare the stress and deformation of recombinant bamboo, rosewood and elm under stress states. Meanwhile, in order to find out which leg shape is most suitable for the back chair of recombinant bamboo, the impact of the current mainstream three legs on the mechanical properties of the back chair is analyzed. Moreover, the parametric design method can work out the optimum size of legs and seat which are the most important design elements of back chair. This provides an evidence-based and effective method for furniture design.