Experimental and numerical study on the screw connection strength of bamboo-oriented strand board compared with wood-oriented strand board

Kaiting Zhang,Chuangye Li,Yong Guo,Runmin Xu,Yuxia Chen,Bin Yan,Shengquan Liu,Xinhui Fan,Fuli Wang

doi:10.1186/s10086-021-01999-z

Abstract

The utilization of resourceful bamboo can alleviate the wood shortage problem. Bamboo-oriented strand board (BOSB) with the highest utilization of bamboo ratio and excellent mechanical properties was considered as a good engineering and furniture material. The strength of joints affects the safety of BOSB structure. This study aims to investigate the effect of screw spacing on the tensile and compressive stiffness and strength of corner joints from BOSB by experimental method combined with finite element method (FEM) compared with wood-oriented strand board (WOSB). The results showed that (1) the strength and stiffness of the corner joint was significantly affected by the screw spacing, and it affected the compressive strength and stiffness of WOSB more significantly; (2) the bending moment and stiffness coefficient of BOSB compressed joint decreased with the increase of spacing, while that of tensile joint increased first and then decreased, and it reached the maximum value, when the spacing was 48 mm; (3) compared with WOSB joint, BOSB joint had higher strength and stiffness, and the failure of the joint was due to the yielding of self-drilling screws. This was also verified by numerical analysis results; (4) the bending moment of BOSB joints was about 2.5 times that of WOSB joints, while the difference between stiffness coefficient was small; (5) the elastic deformations resulted from experimental tests and FEM are similar. It was shown that when the screw spacing is 48 mm, the Von Mises stresses on the BOSB joint were smaller, and the bending strength and stiffness were larger, which was the most suitable screw spacing.

Highlights

China is one of the countries with the richest bamboo resources and is known as the "Bamboo Kingdom" [1]
The specific objectives of this study are to (1) investigate the effect of screw spacing on the strength and stiffness of Bamboo-oriented strand board (BOSB) and wood-oriented strand board (WOSB) joint by experimental and finite element method (FEM) method; (2) verify the accuracy of the FEM compared with the experimental results; (3) determine the optimal self-drilling screws installation spacing of BOSB and WOSB joint
Joint were smooth with no rapid changes after the maximum forces, but the curve of WOSB joint dropped rapidly after reaching the maximum force. This mean that (15) the BOSB joints fixed by self-drilling screw had good durability and the strength of the joints did not decrease rapidly after reaching ultimate load, which could ensure the safety of the joint

Summary

Introduction

China is one of the countries with the richest bamboo resources and is known as the "Bamboo Kingdom" [1]. Bamboo utilization ranks first in the world in terms of product varieties, scale, and output [1,2,3,4]. In. Zhang et al Journal of Wood Science (2021) 67:69. The joints in furniture are the weakest elements in terms of their strength and stiffness [14]. Many studies focus on the bending moment capacity and stiffness of joints [15]. The mechanical properties of wood composite joints have been studied comprehensively, such as PB (particleboard), MDF (medium-density fiberboard), HDF (high-density fiberboard), WOSB as well as new adhesives and connectors. There are few researches on the strength of BOSB jointed

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Results

Conclusion