Influence of specimen orientation on determination of elesticity in static bending
Document title: Influence of specimen orientation on determination of elesticity in static bending
Journal: Maderas : ciencia y tecnología
Database:
System number: 000544656
ISSN: 0718-221X
Authors: 1
1
1
2
1
Institutions: 1University of São Paulo, School of Engineering of São Carlos, São Carlos, São Paulo. Brasil
2Federal University of São João del Rei, Mechanical Engineering Department (, São João del Rei, Minas Gerais. Brasil
Year:
Season: Abr
Volumen: 17
Number: 2
Pages: 229-238
Country: Chile
Language: Inglés
English abstract Wood is a natural material and so many factors interfere in estimation of its physical and mechanical properties. Consequently variability in properties should be taken into account to rationalize its application. Longitudinal modulus of elasticity is one of the main mechanical properties of the material, and its value can be obtained via standardized tests. The aim of this study is to evaluate the influence of test conditions compatible with ABNT NBR 7190:1997 Code requirements to determine modulus of elasticity in static bending. For each of eight species, eight specimens were tested, all of them four times, with the sample oriented on each of its four faces related to load application. Data analysis was performed independently of species and their respective strength class, using hypothesis testing to evaluate influence of specimens’ orientations to determination. It was concluded that specimen orientation is significant in determining modulus of elasticity in static bending according to ABNT NBR 7190:1997. This aspect can lead to a future normative review by the National Committee responsible by redaction of this Code. To represent natural variability of wood in specimens’ volume by only one bending test, values of the modulus of elasticity should be lessened in 8%.
Keyword: Modulus of elasticity,
Static Bending,
Tests,
Stiffness
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