Rigidity coefficients of rubber belts for dynamic testing of modulus of elasticity and shear modulus of non-wood engineered board

• Published in: Bioresources 2024-11, Vol.19 (4), p.8512-8526
• Main Authors: Xu, Benhuan, Xu, Qiyun, Wang, Zheng, Shen, Zhaoyu, Lin, Qing
• Format: Article
• Language: English
• Subjects: Accuracy; Bend tests; Composite materials; Dynamic tests; Error analysis; Error correction; four-point bending method; Lumber; Mechanical properties; Methods; Modulus of elasticity; Rigidity; Rubber; rubber belts; Shear modulus; stiffness coefficient; Stiffness coefficients; Storage modulus; transient excitation method; Wood; Wood composites
• ISSN: 1930-2126; 1930-2126
• DOI: 10.15376/biores.19.4.8512-8526

To determine the appropriate stiffness coefficient k values for rubber belts used in dynamic testing of the elastic modulus and shear modulus of timber and solid wood composite materials, this study employed three different thicknesses of rubber belts. Dynamic tests were conducted on straw boards, Laminated Veneer Lumber (LVL), and Spruce-Pine-Fir (SPF) materials, and the results were validated and analyzed using static four-point bending tests. The conclusions drawn from this research indicate that the range of stiffness coefficient k values for the rubber belts obtained through dynamic testing fell between 0.05 and 0.28 N/m. The correctness of the dynamic testing method was verified through static four-point bending tests. The error levels for elastic modulus E and shear modulus G of the same type of board measured using the three different rubber belts were below 9.5% and 9.8%, respectively.