Elastic Properties of Oak Wood Finger Joints with Polyvinyl Acetate and Isocyanate Adhesives

Hemmasi, Amir Hooman; Khademi-Eslam, Habibolla; Roohnia, Mehran; Bazyar, Behzad; Yavari, Ali

doi:10.15376/biores.9.1.849-860

Cited by 8 publications

(6 citation statements)

References 6 publications

(8 reference statements)

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“…As theoretically assumed and confirmed by previous research findings (Herak et al 2009;Hemmasi et al 2014;Roohnia et al 2014), considering the steepest angle (75°), the same trend was observed: a significant difference in the performance of PVAc and isocyanate glued samples in different planes of vibration, comparing the acoustical properties of the solid and jointed samples.…”

Section: Resultssupporting

confidence: 88%

Quality Assessment of Scarf Joints Considering the Acoustic Parameters: A Nondestructive Approach

Yavari

Roohnia

2015

BioResources

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The present research studied the acoustic properties of 40 oak timber samples (Quercus castaneifolia): the acoustic coefficient (K) and acoustic conversion efficiency (ACE) in free vibration mode, using the free-free bar method with different planes of vibration, i.e., tangential (LT) and radial (LR). These acoustic parameters were considered for both primary virgin wooden beams and modified beams carrying a single scarf joint in four different bonding angles (60°, 65°, 70°, and 75°), individually glued with two different adhesives (isocyanate and polyvinyl acetate). Comparing the acoustic properties of primary solid beams with scarf jointed beams of oak wood in LT and LR planes, the steeper joint angles of 70° and 75° did not result in any serious changes with polyvinyl acetate adhesive. Scarfjointed beams with smaller joint angles (60° and 65°) had significant effect on the acoustic properties relative to larger angles. Thus, beams having larger joint angles and beams glued using polyvinyl acetate may have enhanced acoustic properties.

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Section: Resultssupporting

confidence: 88%

Quality Assessment of Scarf Joints Considering the Acoustic Parameters: A Nondestructive Approach

Yavari

Roohnia

2015

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“…Polyvinyl acetate and isocyanate (ISO) adhesives were previously studied for finger joints [11]. Comparing the elastic properties of solid beams with finger-jointed beams of oak wood in both tangential and radial flexural directions, longer finger lengths with PVA adhesive did not cause any serious change to elastic properties of the beams, while shorter finger lengths with ISO adhesive severely changed the acoustic properties.…”

Section: Introductionmentioning

confidence: 99%

Modulus of elasticity in scarf-jointed wooden beams: a case study with polyvinyl acetate and isocyanate adhesives

et al. 2014

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In the present study, elastic properties of scarfjointed oak (Quercus castaneifolia) timbers with the application of two different types of adhesives (polyvinyl acetate and isocyanate) were evaluated using free flexural vibration of free-free beam method in different flexural directions of vibration, i.e., tangential and redial directions. Samples were taken from trees of Hyrcanian forests in Iran with nominal dimensions of 20 9 20 9 360 mm 3 . Comparing the results of elastic properties of clear oak wood beams with scarf-jointed samples wood showed that scarf joints with the bonding angles of 70°and 75°, covered by polyvinyl acetate adhesive, did not demonstrate any significant effect on modules of elasticity. Scarf-jointed beams with smaller joint angles (60°and 65°) were considerably weaker or totally unreliable in their moduli of elasticity. It is also shown that the magnitude of effect gets worst by using isocyanate rather than polyvinyl acetate adhesive.

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“…The adhesives used in this study had a slight effect on the elastic stiffness. Hemmasi et al (2014) found in previous studies concerning a 10-mm oak wood finger joint that the PVAc adhesive did not cause any serious change in the studied elastic properties of the beams. Under tensile load, the elastic stiffness of 5 teeth joints have interesting results.…”

Section: Resultsmentioning

confidence: 68%

Influence of geometry on the stiffness of corner finger joints

Kamboj

Záborský

Girl

2019

BioRes

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Finger joints enable the full utilization of wood. The finger joint technique is used to eliminate wood defects that would otherwise weaken the wood strength. This research project evaluated how the wood species, adhesive type, and number of teeth affect the elastic stiffness of finger joints. The adhesives used were polyurethane and polyvinyl acetate, and the wood species were beech (Fagus sylvatica L.) and spruce (Picea abies L.). This study also determined the elastic stiffness of finger joints with 2 teeth and 5 teeth. For this purpose, the samples were loaded via a bending moment reaction, with tensile or compression forces in the angular plane. The highest elastic stiffness was obtained from the beech wood samples with 5 teeth bonded with polyvinyl acetate adhesive under tensile stress. Therefore, it was concluded that the elastic stiffness increased when the number of teeth increased. However, further studies on the elastic stiffness of finger joints are necessary in relation to the finger teeth length and surface area of the glue between the finger joint connections.

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Elastic Properties of Oak Wood Finger Joints with Polyvinyl Acetate and Isocyanate Adhesives

Cited by 8 publications

References 6 publications

Quality Assessment of Scarf Joints Considering the Acoustic Parameters: A Nondestructive Approach

Quality Assessment of Scarf Joints Considering the Acoustic Parameters: A Nondestructive Approach

Modulus of elasticity in scarf-jointed wooden beams: a case study with polyvinyl acetate and isocyanate adhesives

Influence of geometry on the stiffness of corner finger joints

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