Shear and elastic moduli of Poplar wood affected by glue coverage deficiency of lamination in a vibration based nondestructive approach

تحقیقات علوم چوب و کاغذ ایران

Mehran Roohnia¹  Ajang Tajidini²  Ehsan Haji rafiriha³  Ahmad Jahan latibari⁴ 

[1] Associate Professor, Wood and Paper Science and Technology, Karaj Branch, Islamic AzadUniversity, Karaj, Iran,;Associate Professor, Wood and Paper Science and Technology, Karaj Branch, Islamic AzadUniversity, Karaj, Iran;M.Sc., Wood and Paper Science and Technology, Karaj Branch, Islamic Azad University, Karaj, Iran;Professor, Wood and Paper Science and Technology, Karaj Branch, Islamic AzadUniversity, Karaj, Iran;

关键词: flexural vibration;    glue deficiency;    longitudinal vibration;    MODULUS OF ELASTICITY;    Shear modulus;   

DOI  :  10.22092/ijwpr.2014.8458

来源: DOAJ

【 摘 要 】

The effect of lamination and adhesive coverage rate in layered products made from Poplar wood was studied The effect of lamination and adhesive coverage rate in layered products made from Poplar wood was studied by non-destructive free vibration test. 120 samples with nominal dimensions of 2.5×2.5×45 cm without any obvious deficiencies were selected and free flexural vibration in free-free bars were performed for testing them. Samples were longitudinal cut in three thinner tangential layers and jointed together again using Poly Vinyl Acetate glue. The specimens were divided into four groups according to adhesive coverage rates, which one group was fully glued and 3 groups were carrying some glue deficiencies in different rates. Manipulated samples were tried again in above mentioned test. Results indicated that shear moduli compare to modulus of elasticity is a more sensitive parameter to evaluate glue efficiency in laminated beams but concerns remained due to blind points in flexural vibration nondestructive method.

【 授权许可】

Unknown