Mechanical Behavior of Separated Earlywood and Latewood of Douglas–Fir Using Digital Image Correlation Method

Kang, Chun‐Won; Schwarzkope, Matthew; Muszyński, Lech; Jin, Tao; Park, Hee–Jun; Huang, Kang; Matsumura, Junji; 松村, 順司

doi:10.5109/1434401

Cited by 3 publications

(2 citation statements)

References 9 publications

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“…The specimens of DF-R-FC exhibited noticeable differences in strain distribution between the earlywood and latewood sections, in contrast to AL-FC and DF-L-FC. Owing to the discontinuous change in mechanical properties between earlywood and latewood (Kang et al 2014), significant compressive strain occurred in the earlywood near the boundary with the latewood. The trend of localised deformation of radial compressive specimens was similar to that reported by Murata et al (2003).…”

Section: Fea Of Partial Compression Testmentioning

confidence: 99%

“…However, deriving theoretical formulas from elasticity mechanics for the partial compression problem of wood, which is both orthotropic and heterogeneous, presents significant challenges. The FEA approach could be employed to explore the strain distribution of the partial compression test specimens, but this requires the measurement of mechanical properties of earlywood and latewood (Kang et al 2014;Kuo et al 2019), as well as precise identification of the distribution of these wood types within the specimen using techniques such as X-ray computed tomography imaging. Validating strain gauges in partial compression tests of wood remains a task for future research.…”

Section: Errors In Dic System and Strain Gaugementioning

confidence: 99%

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Accuracy of digital image correlation system for compressive behaviour of wood

Teranishi,

Matsubara

2024

Preprint

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The digital image correlation (DIC) system is a powerful tool for measuring distributions of displacement and strain on the surface of a specimen. DIC systems are employed not only for homogeneous materials such as metals but also for heterogeneous materials such as wood. Although numerous validations of DIC system accuracy for metallic materials exist, accuracy verification for wood, especially under multiaxial stress conditions, is less common. This study investigated the accuracy of a DIC system equipped with a bilateral telecentric lens on wood (Douglas fir). The accuracy verification in uniaxial stress fields was conducted through full compression testing, while verification in multiaxial stress fields was performed through partial compression testing. Additionally, compression tests on A6063 (aluminium alloy) were conducted to examine the differences in DIC system accuracy between homogeneous and heterogeneous materials. The accuracy of the DIC system was assessed by comparing the results with those obtained from strain gauges. The results from the full compression tests indicate that the accuracy of axial strain measured by the DIC system was comparable for the specimens of A6063 and Douglas fir in the longitudinal (L) direction but was inferior for Douglas fir in the radial (R) direction. Furthermore, the differences in Young’s modulus obtained from the DIC system and strain gauge for the specimens of A6063, Douglas fir (L), and Douglas fir (R) were 2.3%, 2.4%, and 13.7%, respectively. In the partial compression tests, the accuracy of equivalent strain measured by the DIC system in the specimens of Douglas fir (R) was lower than that in A6063, attributable to a high strain gradient in the attachment region of the strain gauge. A novel variable was proposed using the standard deviation of strain to evaluate this strain gradient within the region. This variable demonstrated correspondence to the difference in equivalent strain obtained from the DIC system and the triaxial strain gauge, regardless of the material’s homogeneity or heterogeneity.

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Section: Fea Of Partial Compression Testmentioning

confidence: 99%

Section: Errors In Dic System and Strain Gaugementioning

confidence: 99%