Non-destructive determination of modulus of elasticity and in-plane shear modulus of full-size wood composite panels

GUAN Cheng, ZHANG Houjiang,MIAO Hu, ZHOU Lujing

JOURNAL OF NANJING FORESTRY UNIVERSITY ›› 2017, Vol. 41 ›› Issue (04) : 153-159.

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南京林业大学学报（自然科学版）
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JOURNAL OF NANJING FORESTRY UNIVERSITY ›› 2017, Vol. 41 ›› Issue (04) : 153-159. DOI: 10.3969/j.issn.1000-2006.201609020

Non-destructive determination of modulus of elasticity and in-plane shear modulus of full-size wood composite panels

  • GUAN Cheng, ZHANG Houjiang*,MIAO Hu, ZHOU Lujing
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Abstract

【Objective】This paper presents a method based on transverse free vibration for the rapid, online non-destructive determination of the modulus of elasticity(MOE)along the length and width directions as well as in-plane shear modulus of full-size wood composite panels(WCPs). Accordingly, the three frequencies for the first-order bending along the length and width directions, as well as the torsion for the full-size WCPs supported on four nodes and their density, were measured.【Method】Five full-size WCP pieces were tested through experimental model analysis, including three different thicknesses of medium density fiberboards(MDF)and two different thicknesses of plywood(PW). The natural frequencies and mode shapes of the first nine modes for full-size WCPs supported on four nodes were obtained. Following modal testing, the mechanical properties for the full-size WCPs were measured, and the repeat ability of the test results was analyzed.【Result】The first and seventh order mode shapes for both MDF and plywood indicated the first order bending along the length and width directions respectively. The fifth order mode for MDF and fourth order mode for plywood indicated torsion. The results of the test showed excellent repeatability.【Conclusion】Determination of the MOE along the length and width directions,as well as the in-plane shear modulus of the full-size WCPs supported on four nodes based on the transverse free vibration, is thus feasible.

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GUAN Cheng, ZHANG Houjiang,MIAO Hu, ZHOU Lujing. Non-destructive determination of modulus of elasticity and in-plane shear modulus of full-size wood composite panels[J]. JOURNAL OF NANJING FORESTRY UNIVERSITY. 2017, 41(04): 153-159 https://doi.org/10.3969/j.issn.1000-2006.201609020

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