Comparison between modulus of elasticity values calculated using 3 and 4 point bending tests of wooden samples
Several data banks on wooden properties of different species contain mechanical characteristics of which the bending modulus of elasticity. This modulus can be calculated using different test methods, the more ordinary used are the 3 point and 4 point bending tests. The values obtained by one method cannot be directly compared with those of other methods. So the bending properties read in a data bank have to be converted before using them and correctly compared with other data from different references. The aim of this study is to make an analytic formula of a crossing coefficient between 3 point and 4 point bending concerning the longitudinal modulus of elasticity measured following the French standards (NF 1942; NF 1987). This formula includes a study of the shear force influence, and a study of supports and loading head indentation effect, in a 3 point bending test. The analytical study and the experiences have shown that the supports and loading head indentation effect are not negligible but have the same influence as the shear effect. The indentation is the result of the competition between two physical phenomena which are the wood stiffness and the load level applied on the piece of wood during a bending test. The practical result of this study is the development of a crossing analytic formula from a 3 point bending modulus of elasticity to a 4 point bending one, verified by the experimentation.
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Language: | eng |
Subjects: | K50 - Technologie des produits forestiers, Élasticité, propriété technologique, échantillonnage, propriété physicochimique, http://aims.fao.org/aos/agrovoc/c_26777, http://aims.fao.org/aos/agrovoc/c_2572, http://aims.fao.org/aos/agrovoc/c_6774, http://aims.fao.org/aos/agrovoc/c_1521, |
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dig-cirad-fr-5203862024-01-28T12:31:31Z http://agritrop.cirad.fr/520386/ http://agritrop.cirad.fr/520386/ Comparison between modulus of elasticity values calculated using 3 and 4 point bending tests of wooden samples. Brancheriau Loïc, Baillères Henri, Guitard D.. 2002. Wood Science and Technology, 36 (5) : 367-383.https://doi.org/10.1007/s00226-002-0147-3 <https://doi.org/10.1007/s00226-002-0147-3> Comparison between modulus of elasticity values calculated using 3 and 4 point bending tests of wooden samples Brancheriau, Loïc Baillères, Henri Guitard, D. eng 2002 Wood Science and Technology K50 - Technologie des produits forestiers Élasticité propriété technologique échantillonnage propriété physicochimique http://aims.fao.org/aos/agrovoc/c_26777 http://aims.fao.org/aos/agrovoc/c_2572 http://aims.fao.org/aos/agrovoc/c_6774 http://aims.fao.org/aos/agrovoc/c_1521 Several data banks on wooden properties of different species contain mechanical characteristics of which the bending modulus of elasticity. This modulus can be calculated using different test methods, the more ordinary used are the 3 point and 4 point bending tests. The values obtained by one method cannot be directly compared with those of other methods. So the bending properties read in a data bank have to be converted before using them and correctly compared with other data from different references. The aim of this study is to make an analytic formula of a crossing coefficient between 3 point and 4 point bending concerning the longitudinal modulus of elasticity measured following the French standards (NF 1942; NF 1987). This formula includes a study of the shear force influence, and a study of supports and loading head indentation effect, in a 3 point bending test. The analytical study and the experiences have shown that the supports and loading head indentation effect are not negligible but have the same influence as the shear effect. The indentation is the result of the competition between two physical phenomena which are the wood stiffness and the load level applied on the piece of wood during a bending test. The practical result of this study is the development of a crossing analytic formula from a 3 point bending modulus of elasticity to a 4 point bending one, verified by the experimentation. article info:eu-repo/semantics/article Journal Article info:eu-repo/semantics/publishedVersion http://agritrop.cirad.fr/520386/1/520386.pdf text Cirad license info:eu-repo/semantics/restrictedAccess https://agritrop.cirad.fr/mention_legale.html https://doi.org/10.1007/s00226-002-0147-3 10.1007/s00226-002-0147-3 http://catalogue-bibliotheques.cirad.fr/cgi-bin/koha/opac-detail.pl?biblionumber=181813 info:eu-repo/semantics/altIdentifier/doi/10.1007/s00226-002-0147-3 info:eu-repo/semantics/altIdentifier/purl/https://doi.org/10.1007/s00226-002-0147-3 |
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K50 - Technologie des produits forestiers Élasticité propriété technologique échantillonnage propriété physicochimique http://aims.fao.org/aos/agrovoc/c_26777 http://aims.fao.org/aos/agrovoc/c_2572 http://aims.fao.org/aos/agrovoc/c_6774 http://aims.fao.org/aos/agrovoc/c_1521 K50 - Technologie des produits forestiers Élasticité propriété technologique échantillonnage propriété physicochimique http://aims.fao.org/aos/agrovoc/c_26777 http://aims.fao.org/aos/agrovoc/c_2572 http://aims.fao.org/aos/agrovoc/c_6774 http://aims.fao.org/aos/agrovoc/c_1521 |
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K50 - Technologie des produits forestiers Élasticité propriété technologique échantillonnage propriété physicochimique http://aims.fao.org/aos/agrovoc/c_26777 http://aims.fao.org/aos/agrovoc/c_2572 http://aims.fao.org/aos/agrovoc/c_6774 http://aims.fao.org/aos/agrovoc/c_1521 K50 - Technologie des produits forestiers Élasticité propriété technologique échantillonnage propriété physicochimique http://aims.fao.org/aos/agrovoc/c_26777 http://aims.fao.org/aos/agrovoc/c_2572 http://aims.fao.org/aos/agrovoc/c_6774 http://aims.fao.org/aos/agrovoc/c_1521 Brancheriau, Loïc Baillères, Henri Guitard, D. Comparison between modulus of elasticity values calculated using 3 and 4 point bending tests of wooden samples |
description |
Several data banks on wooden properties of different species contain mechanical characteristics of which the bending modulus of elasticity. This modulus can be calculated using different test methods, the more ordinary used are the 3 point and 4 point bending tests. The values obtained by one method cannot be directly compared with those of other methods. So the bending properties read in a data bank have to be converted before using them and correctly compared with other data from different references. The aim of this study is to make an analytic formula of a crossing coefficient between 3 point and 4 point bending concerning the longitudinal modulus of elasticity measured following the French standards (NF 1942; NF 1987). This formula includes a study of the shear force influence, and a study of supports and loading head indentation effect, in a 3 point bending test. The analytical study and the experiences have shown that the supports and loading head indentation effect are not negligible but have the same influence as the shear effect. The indentation is the result of the competition between two physical phenomena which are the wood stiffness and the load level applied on the piece of wood during a bending test. The practical result of this study is the development of a crossing analytic formula from a 3 point bending modulus of elasticity to a 4 point bending one, verified by the experimentation. |
format |
article |
topic_facet |
K50 - Technologie des produits forestiers Élasticité propriété technologique échantillonnage propriété physicochimique http://aims.fao.org/aos/agrovoc/c_26777 http://aims.fao.org/aos/agrovoc/c_2572 http://aims.fao.org/aos/agrovoc/c_6774 http://aims.fao.org/aos/agrovoc/c_1521 |
author |
Brancheriau, Loïc Baillères, Henri Guitard, D. |
author_facet |
Brancheriau, Loïc Baillères, Henri Guitard, D. |
author_sort |
Brancheriau, Loïc |
title |
Comparison between modulus of elasticity values calculated using 3 and 4 point bending tests of wooden samples |
title_short |
Comparison between modulus of elasticity values calculated using 3 and 4 point bending tests of wooden samples |
title_full |
Comparison between modulus of elasticity values calculated using 3 and 4 point bending tests of wooden samples |
title_fullStr |
Comparison between modulus of elasticity values calculated using 3 and 4 point bending tests of wooden samples |
title_full_unstemmed |
Comparison between modulus of elasticity values calculated using 3 and 4 point bending tests of wooden samples |
title_sort |
comparison between modulus of elasticity values calculated using 3 and 4 point bending tests of wooden samples |
url |
http://agritrop.cirad.fr/520386/ http://agritrop.cirad.fr/520386/1/520386.pdf |
work_keys_str_mv |
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_version_ |
1792495867591131136 |