Influência do teor de umidade na propriedade de tenacidade de espécies florestais

Stolf, Denise Ortigosa; Bertolini, Marília da Silva; Ferro, Fabiane Salles; Christofóro, André Luis; Lahr, Francisco Antônio Rocco

doi:10.1590/2179-8087.067014

Cited by 5 publications

(5 citation statements)

References 11 publications

(10 reference statements)

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“…Special attention has been paid to the performance of wood species used in impacting practices, mainly in applications such as the above mentioned, thus motivating research in the area. For instance, there are the studies of Beltrame et al (2010), Beltrame et al (2012), Stolf et al (2014), and Stolf et al (2015), which investigated the influence of factors such as wood moisture content and growth ring orientation on total absorbed energy or toughness (W), impact resistance, resilience coefficient, and dynamic dimension. However, these studies did not estimate toughness as a function of other properties of wood characterization (Almeida et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

Estimation of Wood Toughness in Brazilian Tropical Tree Species

et al. 2020

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Wood has been used for several purposes such as in civil and rural construction. Knowing wood mechanical behavior under short-term loading is essential for safer structural designs. However, wood toughness is a mechanical property little investigated for this purpose. Thus, this study aimed to evaluate, using exponential and polynomial regression models (linear, quadratic, and cubic), the possibility of estimating toughness as a function of apparent density, compression parallel to grain strength, and modulus of rupture in static bending. Thirty-six Brazilian tropical wood species from south of Roraima, Mato Grosso do Sul, and north and northeast of Mato Grosso were tested. Our results showed the significance and representativeness of all investigated fits, among which a cubic polynomial function is the most indicated for wood toughness estimates.

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Section: Introductionmentioning

confidence: 99%

Estimation of Wood Toughness in Brazilian Tropical Tree Species

et al. 2020

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“…This machine is rarely found in the Brazilian's research centers. Thus, it is identified the importance of the development of research in the search of estimating the toughness in function of other properties of the wood [13][14][15][16].…”

Section: Introductionmentioning

confidence: 99%

Toughness and Impact Strength in Dynamic Bending of Wood as a Function of the Modulus of Elasticity and the Strength in Compression to the Grain

Moreira¹,

Silveira²,

Almeida³

et al. 2017

ijme

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Toughness is the mechanical property that determines the wood strength when a force acts in a short time interval. Its value is determined in the bending impact test. Timber has to resist to impact forces in several applications, nevertheless this property is not widely studied to tropical wood species from Brazil. This study aimed to correlate the toughness and the impact strength of wood with the modulus of elasticity and the strength in the compression parallel to grain test. Therefore ten tropical species, from different strength classes, grown in Brazil were tested according to the Brazilian Standard Code ABNT NBR 7190:1997. The studied species were: Cedro (Cedrella sp.), Cambará Rosa (Erisma uncinatum Warm), Cedrorana (Cedrelinga cateniformis), Catanudo (Calophyllum sp.), Cupiúba (Goupia glabra), Angelim Saia (Parkia spp.), Tatajuba (Bagassa guianensis Aubl.), Guaiçara (Luetzelburgia sp.), Cumaru (Dipteryx odorata) and Angelim Vermelho (Dinizia excelsa Ducke). It was developed a relation between the studied properties through regression models, evaluated according to the variance analysis (ANOVA). The results of the statistical analysis revealed led to the conclusion that there is no correlation between the proposed properties for the analyzed species.

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“…Physical and mechanical wood characterization has the most important for better utilization of this material, bring development to the build system and to the use of this as a construction material [1][2][3]. Characterization process follows the procedures of the Brazilian code ABNT NBR 7190:1997 "Timber Structures Design" in its annex B" Determination of Wood properties for Structure Design".…”

Section: Introductionmentioning

confidence: 99%

“…Impact in bending test scheme. Fonte: Stolf [1], adopted from Siqueira [12] Equations 1 and 2 can be used to calculate the rupture energy W and the impact strength in bending f bw , respectively. This property determination presents some difficulties for the need of a specific machine as shown the figure 1, and because of it, this value is not determined in some cases.…”

Section: Introductionmentioning

confidence: 99%

Impact Strength in Dinamic Bending as a Function of the Strength in Static Bending of Wood

Silveira¹,

Almeida²,

Almeida³

et al. 2018

ijme

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Wood is a natural, renewable and abundant material in Brazilian territory. But its use in civil construction is still commonplace. When compared to materials such as steel and concrete, it has many advantages, such as its resistance to density ratio. Where it is possible to observe a high resistance, equivalent to concrete of high performance with a much smaller density. Due to the heterogeneity of the woods, very different behaviors may occur in response to the various requests. Thus, for a better use of its capacity is essential knowledge of its properties. Among them is impact strength in bending. Impact strength in bending knowledge is fundamental in structures that will be exposed to short-lived impact loads, such as bridges. But due to some factors this is not a mechanical property that is very accessible to most research centers. The objective of this research was to use linear, exponential, logarithmic and geometric regression models to verify if it is possible to obtain a relation between the resistance modulus in the static bending, which is more easily obtained, and the impact strength in bending values. Ten Brazilian wood species were selected and static bending and impact in bending tests were performed according to ABNT NBR 7190:1997. All tests were done in the Wood and Timber Structures Laboratory (LaMEM), in the Department of Structural Engineering of the Engineering School of São Carlos, University of São Paulo. According to the results and the statistical analysis performed, it was possible to conclude that the Strength in static bending does not seem to be a good estimator of the impact strength in bending of wood.

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Influência do teor de umidade na propriedade de tenacidade de espécies florestais

Cited by 5 publications

References 11 publications

Estimation of Wood Toughness in Brazilian Tropical Tree Species

Estimation of Wood Toughness in Brazilian Tropical Tree Species

Toughness and Impact Strength in Dynamic Bending of Wood as a Function of the Modulus of Elasticity and the Strength in Compression to the Grain

Impact Strength in Dinamic Bending as a Function of the Strength in Static Bending of Wood

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