Measurement of dynamic modulus of elasticity and damping ratio of wood-based composites using the cantilever beam vibration technique

Wang, Zheng; Li, Ling; Gong, Meng

doi:10.1016/j.conbuildmat.2011.09.001

Cited by 63 publications

(32 citation statements)

References 4 publications

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“…Figure 2 shows the frequency spectrum of Mongolian Oak specimen No. 4 (Wang et al 2008;Wang et al 2012). Through the calculation of the amplitude ratios between the transverse and longitudinal strain at the first-order bending frequency, the Poisson's ratio was calculated to be 0.577.…”

Section: Methods Of Pasting the Strain Rosette And Bridge Connectionmentioning

confidence: 99%

Measurement of the Poisson’s Ratio of Materials Based on the Bending Mode of the Cantilever Plate

et al. 2016

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Principles and methods to dynamically test the Poisson's ratio of isotropic material and timber are proposed in this work. Five species of lumbers were processed into cantilever plates of tangential, radial, and cross sections with different length-width ratios of 6, 5, 4, and 3. The "Shell 63" element in ANSYS software was adopted to calculate strain and stress under the first-order bending mode. The paste position of the strain rosette for the Poisson's ratio of timber was obtained through strain-stress relationship and regression analysis under states of stress, strain analysis, and plane stress. This method was also applied to steel, aluminum, and glass. For both isotropic and orthotropic materials such as timber, the paste positions of the strain rosette were determined by the position where transverse stress within the plate was zero during the first-order bending vibration. Meanwhile, the lateral and longitudinal strains of the spectrum were measured using the transient excitation method. In the spectrum, the ratio of linear amplitude between the lateral and longitudinal strain of the first-order bending frequency was taken as the measured value of the Poisson's ratio of the material. The accuracy of the results was verified by axial tension and static four-point bending tests.

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Section: Methods Of Pasting the Strain Rosette And Bridge Connectionmentioning

confidence: 99%

Measurement of the Poisson’s Ratio of Materials Based on the Bending Mode of the Cantilever Plate

et al. 2016

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“…The specimen was hit on another side along the half-width line to produce a transient stimulating signal. A similar study reported that chosen points have no significant influence on the final results (Wang et al 2012), so in this study, only one point was set 50 mm from the free end. After hitting, the pressure sensor imbedded in the hammer captured and input the signals to the FFT analyzer along channel 1 after amplification.…”

Section: Damping Propertiesmentioning

confidence: 99%

“…So far, little is known about the vibration frequencies of planted poplar wood. Referring to a study by Wang et al (2012) on the natural frequency of catalpa wood (density 0.453 g/cm 3 , moisture content 9%), it was found that the first-, second-, and third-order natural frequencies of catalpa are 40 to 42 Hz, 108 to 109 Hz, and 211 to 215 Hz, respectively. Interestingly, LLVRs showed two natural vibration frequencies, at 31 to 51 Hz and 234 to 317 Hz, because of the synergistic effect of wood veneers and rubber sheets.…”

Section: Damping Propertiesmentioning

confidence: 99%

Interfacial Adhesion and Damping Characteristics of Laminated Veneer Lumber Intercalated with Rubber Sheets

Han

Zhan

et al. 2016

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Laminated wood veneer lumber intercalated with rubber sheets (LLVR) was fabricated using a layered adhesive system composed of polyaryl polymethylene isocyanate (PAPI) for wood-rubber inter-bonding and phenol formaldehyde (PF) resin to glue the wood veneers. The optimized manufacturing process (chloroprene rubber: CR; PAPI: 80 g/m 2 ; PF: 200 g/m 2 ; and silane: 9.0 wt.%) was determined. The process as developed was then utilized to fabricate nine-ply LLVRs of five balanced constructions with two or three CR laminates used as various layers. The physico-mechanical properties of the LLVRs were evaluated, and the results showed that LLVRs had strong shear strength, sound dimensional stability, decent bending strength, and favorable toughening and buffering performances. The newly developed product is an interesting potential alternative to traditional laminated veneer lumber or plywood.

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“…Conventionally, non-destructive techniques have been used to determine these performance parameters in WCPs. Most studies conduct nondestructive testing of MOE and shear modulus of small wood composites specimens and full-size WCPs, with remarkable results (McNatt et al 1990;Shyamasunder et al 1993;Larsson 1996;Yoshihara 2011;Wang et al 2012;Hunt et al 2013;Guan et al 2015). However, similar to wood material, WCPs also exhibit dynamic viscoelastic effects.…”

Section: Introductionmentioning

confidence: 99%

Measurement of Dynamic Viscoelasticity of Full-Size Wood Composite Panels Using a Vibration Testing Method

et al. 2016

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The dynamic viscoelasticity of full-size wood composite panels (WCPs) under the free-free vibrational state were determined by a vibration testing method. Vibration detection tests were performed on 194 pieces of three types of full-size WCPs (particleboard, medium density fiberboard, and plywood (PW)). The dynamic viscoelasticity from smaller specimens cut from the panels was measured using a cantilever beam vibration test apparatus, and the two data sets were compared. A strong linear relationship was discovered between the dynamic viscoelasticity values measured by the vibration detection test and the cantilever beam vibration test. The storage modulus values of the panels were far higher than their loss modulus values, and PW panels had the smallest value of loss modulus. For the panels tested, density had a good linear impact on storage modulus. In comparison with density, logarithmic decrement had a greater linear impact on loss modulus. This study demonstrated that the vibration test method is a valid approach for determining the dynamic viscoelasticity of full-size WCPs.

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Measurement of dynamic modulus of elasticity and damping ratio of wood-based composites using the cantilever beam vibration technique

Cited by 63 publications

References 4 publications

Measurement of the Poisson’s Ratio of Materials Based on the Bending Mode of the Cantilever Plate

Measurement of the Poisson’s Ratio of Materials Based on the Bending Mode of the Cantilever Plate

Interfacial Adhesion and Damping Characteristics of Laminated Veneer Lumber Intercalated with Rubber Sheets

Measurement of Dynamic Viscoelasticity of Full-Size Wood Composite Panels Using a Vibration Testing Method

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