Nondestructive assessment of glued joints in timber applying vibration-based methods

Roohnia, Mehran; Kohantorabi, Mostafa; Jahan-Latibari, Ahmad; Tajdini, Ajang; Ghaznavi, Mohammadreza

doi:10.1007/s00107-012-0616-9

Cited by 7 publications

(13 citation statements)

References 9 publications

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“…A tighter selection was made based on Timoshenko's trends in advanced flexural theory, highlighted by Bordonné [13], with Pearson correlation coefficients of higher than 0.99. With the decrease in correlation coefficient, the probability for inhomogeneity of samples will increase; where the Timoshenko model has been fitted initially to isotropic materials, or next to the clearest specimens [3]. Absolutely clear and sound beams were chosen by comparing the longitudinal modulus obtained from radial and tangential flexural directions of vibration in a methodology described by Roohnia et al [3].…”

Section: Martials and Methodsmentioning

confidence: 99%

“…Nondestructive methods were also successful to evaluate the mechanical properties of manipulated, modified or defective wood [2,3]. In the structural performance of finger-jointed black spruce lumber with different joint configurations, tensile strength of various types of end joints were evaluated by Bustos et al [4].…”

Section: Introductionmentioning

confidence: 99%

“…Finger-jointed beams showed lower dynamic modulus of elasticity and lower acoustic coefficient values compared to solid beams [3]. The effects of joint slopes on bending strength of finger-joint connection, bonded with polyvinyl adhesive were also studied by Ajdinaj and Habibi [10].…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Martials and Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

et al. 2014

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“…When there were significant differences between the Young's moduli as evaluated by the two methods, the joints were determined to be weak and were required to be rejected or assigned to re-manufacturing. Additionally, the R 2 value of Timoshenko's linear model significantly decreased when there was any loss of integrity in the joints (Roohnia et al 2012).…”

Section: Introductionmentioning

confidence: 97%

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

Hemmasi¹,

Khademi-Eslam²,

Roohnia³

et al. 2013

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In this study, the elastic properties of 23 specimens of oak timber (Quercus castaneifolia), including the longitudinal modulus of elasticity (MOE), acoustic coefficient (K), and acoustic converting efficiency (ACE) in free vibration using the free-free beam method with different planes of vibration, i.e. tangential (LT) and radial (LR), were studied. These elastic parameters were examined in both sound wood and finger jointed timbers with two different lengths of fingers (5-and 10-mm finger lengths) and individually glued with two different types of adhesives (isocyanate and polyvinyl acetate). Comparing the elastic properties of solid beams with finger jointed beams of oak wood in both (LT) and (LR) planes, 10-mm finger joints with polyvinyl acetate adhesive did not cause any serious change to the studied elastic properties of the beams, while shorter finger length (5 mm) with isocyanate adhesive severely changed the acoustic properties; therefore, beams having longer finger lengths may have enhanced acoustical properties.

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“…Hence, perceiving the necessity of applying joints, several studies have been performed in recent years to shed light on some important factors: joints geometry and configuration (Roohnia et al 2012); the influence of commonly used adhesives , considering the advantages of nondestructive methods such as accuracy, portability, in-situ assessment capabilities, and desirable correlation coefficient of static and dynamic young modulus, (Divos and Tanaka 2005;Biechele et al 2010 ) resulting in increased life span of wood products and quality assurance.…”

Section: Introductionmentioning

confidence: 99%

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

Yavari

Roohnia

2015

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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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Nondestructive assessment of glued joints in timber applying vibration-based methods

Cited by 7 publications

References 9 publications

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

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

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

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

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