Incorporating size effects in the Tsai-Wu strength theory for Douglas-fir laminated veneer

Clouston, Peggi L.; Lam, Frank; Barrett, J. D.

doi:10.1007/s002260050074

Cited by 7 publications

(11 citation statements)

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“…Comparisons of mechanical properties of ESWood with Sitka spruce [41], Douglas-fir LVL [42], Parawood OSL [24], Spruce-pine-fir (SPF) Glulam [43] and laminated bamboo (Glubam) [44] are concluded in Tab. 2.…”

Section: Comparison With Other Wood/bamboo-based Materialsmentioning

confidence: 99%

Mechanical Properties of a Eucalyptus-Based Oriented Oblique Strand Lumber for Structural Applications

Chen¹,

Xiong²,

Wang³

et al. 2019

Journal of Renewable Materials

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Wood and wood-based composite materials have gained increasing attention in the sustainable building industry because of their renewability and environmental friendliness. Oriented oblique strand lumber (Eucalyptus Strand Wood, ESWood), which is manufactured from fast-growing small diameter eucalyptus wood (Eucalyptus urophylla × E. grandis), is introduced in this paper. Small clear specimen tests were conducted to determine the mechanical properties of ESWood material while full-scale component tests were performed to observe the structural performance of ESWood beams. A comparison of mechanical properties of ESWood with other wood/bamboo-based materials is then reported. From the results presented herein, it appears that the strength and stiffness properties of ESWood are affected by grain directionality and glued layers. However, it still has preferable mechanical properties as a building material, which is comparable or superior to those of other engineered wood/bamboo-based products (e.g., Sitka spruce, LVL, OSL, Glulam, and Glubam). Furthermore, results from full-scale component tests show the stable mechanical performance of beams made by ESWood. This study makes a significant contribution to a potential utilization of fast-growing eucalyptus for general use in construction, and the presented mechanical tests results can serve as a fundamental data for more applications of ESWood in practical engineering.

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Section: Comparison With Other Wood/bamboo-based Materialsmentioning

confidence: 99%

Mechanical Properties of a Eucalyptus-Based Oriented Oblique Strand Lumber for Structural Applications

Chen¹,

Xiong²,

Wang³

et al. 2019

Journal of Renewable Materials

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“…Violation of this condition would imply infinite strength for some stress states, which is physically impossible. Several researchers have reported unacceptable results for experimentally obtained values of F 12 (Pipes and Cole 1973;Suhling et al 1984;Clouston 1995). The earlier studies prompted others to explore theoretical solutions (Cowin 1979;Liu 1984).…”

Section: Tsai-wu Criterionmentioning

confidence: 99%

“…This size effect is most prominent with brittle modes of failure and is dependent on the strength variability of the material. Size effect has been acknowledged and addressed in many wood and timber studies, such as Barrett et al (1975), Madsen and Buchanan (1986), and Barrett et al (1995), as well as SCL studies by Sharp and Suddarth (1991) and Clouston et al (1998). Each of these studies espoused the use of Weibull weakest-link theory to quantify size effect.…”

Section: Experimental Database Laminae Propertiesmentioning

confidence: 99%

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Computational Modeling of Strand-Based Wood Composites

Clouston

Lam

2001

J. Eng. Mech.

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A nonlinear stochastic model has been formulated to simulate the stress-strain behavior of strandbased wood composites based on the constitutive properties of the wood strands. Prediction models of this type save time and money in the development of wood composites by computationally gauging the effects of varying raw material characteristics with limited fabrication and testing of the full-scale product. The proposed model uses a stochastic-based materially nonlinear finite-element code with extended capacity to perform Monte Carlo simulations to predict the stress-strain behavior of [Ϯ15] s and [Ϯ30] s angle-ply laminates in tension and compression. The nonlinear constitutive behavior of the wood strands is characterized within the framework of rateindependent theory of orthotropic plasticity, where the plastic flow rule is in accordance with the Tsai-Wu criterion. Shear strength and stiffness of the strands, as well as the interaction parameter of the Tsai-Wu criterion have been estimated through a minimization technique developed in the present study. The model's accuracy was validated through comparisons of the numerical simulation results and experimental data. Excellent agreement was found.

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“…For LVL, the uniaxial strengths are tension and compression, both parallel and perpendicular to grain, and shear. If size significantly affects any one of these strengths, one should first adjust the strength that is derived based on a test specimen volume to a strength that is representative of the model element size [6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Torsional Shear Strength and Size Effect in Laminated Veneer Lumber

Yang

Clouston

Arwade

2014

Advances in Civil Engineering Materials

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This study investigates the effect that specimen depth has on the torsional shear strength of full-size Eastern Species Laminated Veneer Lumber (LVL). Characterization of this effect is valuable for structural design purposes as well as for use in constitutive modeling when predicting member strength of one depth based on member strength of a different depth derived from testing. To this end, torsion tests were carried out on three depths (140, 184, and 235 mm) of 1.98 m long by 44 mm thick 1.9E Eastern Species LVL. The shear strength of each depth was determined based on homogeneous, orthotropic theory for beams of rectangular cross-section. Despite a perceptible trend of slightly decreasing shear strength with increasing depth, an analysis of variance test indicated that no statistically significant depth effect exists as it relates to torsional shear strength. Further, a three dimensional finite element model of the 44 mm by 140 mm specimen indicated that stresses are uniform within the shear span of 2 times the depth plus the grip distance away from each end of the specimen. The predicted average maximum shear stress in this region compared well to the maximum shear stresses obtained experimentally.

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Incorporating size effects in the Tsai-Wu strength theory for Douglas-fir laminated veneer

Cited by 7 publications

References 0 publications

Mechanical Properties of a Eucalyptus-Based Oriented Oblique Strand Lumber for Structural Applications

Mechanical Properties of a Eucalyptus-Based Oriented Oblique Strand Lumber for Structural Applications

Computational Modeling of Strand-Based Wood Composites

Torsional Shear Strength and Size Effect in Laminated Veneer Lumber

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