Comparison of two material models 58 and 143 in Dyna for modelling solid birch wood

Georg Baumann, Florian Feist, Christian Kurzböck, Ulrich Müller, Stefan Hartmann

Publikation: KonferenzbeitragPaperForschung

Abstract

Sustainability plays an increasingly important role in the automotive industry. In order to reduce the
ecological footprint, the suitability of alternative bio-based materials like wood is investigated within the
project WoodC.A.R. In order for wood to be used as an engineering material for structural components
or even crash relevant structures, it has to fulfill high mechanical demands. The material behavior has
to be predictable and describable in a numerical simulation. Therefore, two material models *Mat_58
(*Mat_Laminated_Composite_Fabric) and *Mat_143 (*Mat_Wood) were compared and
validated against quasi-static tension and compression tests in all its six anatomical directions but also
against three-point bending tests with the wood fibers oriented parallel to the beam’s axis. So called
“clear wood” samples, i.e. specimens without any growing features, were tested covering the different
load levels: linear elasticity, strain-hardening, strain-softening and rupture. While *Mat_58 is an
orthotropic material model, *Mat_143 is transversally isotropic which means there is no possibility to
distinguish between the radial and the tangential direction of the material. Therefore, a trade-off for
both directions has to be found. On the other hand, the material law *Mat_143 is able to consider
influences like temperature, moisture content or even the quality respectively sorting degree of the
wood. Both material models show that some simplifications considering the hardening and softening
behavior, especially in compression have to be taken into account in multi-element specimens. While
wood shows softening at longitudinal compression, there is a pronounced hardening in perpendicular
direction. The strengths and weaknesses of both material models are discussed.
Originalspracheenglisch
Seitenumfang11
PublikationsstatusVeröffentlicht - 15 Mai 2019

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Wood
Hardening
Laminated composites
Bending tests
Automotive industry
Sorting
Strain hardening
Sustainable development
Elasticity
Moisture
Fibers
Computer simulation

Schlagwörter

    ASJC Scopus subject areas

    • !!Mechanical Engineering

    Dies zitieren

    Comparison of two material models 58 and 143 in Dyna for modelling solid birch wood. / Baumann, Georg; Feist, Florian; Kurzböck, Christian; Müller, Ulrich; Hartmann, Stefan.

    2019.

    Publikation: KonferenzbeitragPaperForschung

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    abstract = "Sustainability plays an increasingly important role in the automotive industry. In order to reduce theecological footprint, the suitability of alternative bio-based materials like wood is investigated within theproject WoodC.A.R. In order for wood to be used as an engineering material for structural componentsor even crash relevant structures, it has to fulfill high mechanical demands. The material behavior hasto be predictable and describable in a numerical simulation. Therefore, two material models *Mat_58(*Mat_Laminated_Composite_Fabric) and *Mat_143 (*Mat_Wood) were compared andvalidated against quasi-static tension and compression tests in all its six anatomical directions but alsoagainst three-point bending tests with the wood fibers oriented parallel to the beam’s axis. So called“clear wood” samples, i.e. specimens without any growing features, were tested covering the differentload levels: linear elasticity, strain-hardening, strain-softening and rupture. While *Mat_58 is anorthotropic material model, *Mat_143 is transversally isotropic which means there is no possibility todistinguish between the radial and the tangential direction of the material. Therefore, a trade-off forboth directions has to be found. On the other hand, the material law *Mat_143 is able to considerinfluences like temperature, moisture content or even the quality respectively sorting degree of thewood. Both material models show that some simplifications considering the hardening and softeningbehavior, especially in compression have to be taken into account in multi-element specimens. Whilewood shows softening at longitudinal compression, there is a pronounced hardening in perpendiculardirection. The strengths and weaknesses of both material models are discussed.",
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    AU - Baumann, Georg

    AU - Feist, Florian

    AU - Kurzböck, Christian

    AU - Müller, Ulrich

    AU - Hartmann, Stefan

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    N2 - Sustainability plays an increasingly important role in the automotive industry. In order to reduce theecological footprint, the suitability of alternative bio-based materials like wood is investigated within theproject WoodC.A.R. In order for wood to be used as an engineering material for structural componentsor even crash relevant structures, it has to fulfill high mechanical demands. The material behavior hasto be predictable and describable in a numerical simulation. Therefore, two material models *Mat_58(*Mat_Laminated_Composite_Fabric) and *Mat_143 (*Mat_Wood) were compared andvalidated against quasi-static tension and compression tests in all its six anatomical directions but alsoagainst three-point bending tests with the wood fibers oriented parallel to the beam’s axis. So called“clear wood” samples, i.e. specimens without any growing features, were tested covering the differentload levels: linear elasticity, strain-hardening, strain-softening and rupture. While *Mat_58 is anorthotropic material model, *Mat_143 is transversally isotropic which means there is no possibility todistinguish between the radial and the tangential direction of the material. Therefore, a trade-off forboth directions has to be found. On the other hand, the material law *Mat_143 is able to considerinfluences like temperature, moisture content or even the quality respectively sorting degree of thewood. Both material models show that some simplifications considering the hardening and softeningbehavior, especially in compression have to be taken into account in multi-element specimens. Whilewood shows softening at longitudinal compression, there is a pronounced hardening in perpendiculardirection. The strengths and weaknesses of both material models are discussed.

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