lnu.sePublications
Change search
Link to record
Permanent link

Direct link
BETA
Akter, Shaheda T.
Alternative names
Publications (5 of 5) Show all publications
Akter, S. T., Bader, T. K. & Serrano, E. (2019). Modeling of wood under combination of normal stresses with rolling shear stress. In: Presented at CompWood 2019 - International Conference on Computational Methods in Wood Mechanics - from material properties to Timber Structures, Växjö, Sweden, June 17-19, 2019: . Paper presented at CompWood 2019 - International Conference on Computational Methods in Wood Mechanics - from material properties to Timber Structures, Växjö, Sweden, June 17-19, 2019. Växjö, Sweden
Open this publication in new window or tab >>Modeling of wood under combination of normal stresses with rolling shear stress
2019 (English)In: Presented at CompWood 2019 - International Conference on Computational Methods in Wood Mechanics - from material properties to Timber Structures, Växjö, Sweden, June 17-19, 2019, Växjö, Sweden, 2019Conference paper, Oral presentation with published abstract (Refereed)
Place, publisher, year, edition, pages
Växjö, Sweden: , 2019
National Category
Wood Science Building Technologies
Research subject
Technology (byts ev till Engineering), Forestry and Wood Technology; Technology (byts ev till Engineering), Civil engineering
Identifiers
urn:nbn:se:lnu:diva-89211 (URN)
Conference
CompWood 2019 - International Conference on Computational Methods in Wood Mechanics - from material properties to Timber Structures, Växjö, Sweden, June 17-19, 2019
Available from: 2019-09-20 Created: 2019-09-20 Last updated: 2019-11-04Bibliographically approved
Akter, S. T., Bader, T. K. & Serrano, E. (2019). Modelling of wood under compression perpendicular to the grain with rolling shear in cross-laminated timber. In: Presented at COMPLAS 2019 - XV International Conference on Computational Plasticity: Fundamentals and Applications, Barcelona, Spain, September 3-5, 2019: . Paper presented at COMPLAS 2019 - XV International Conference on Computational Plasticity: Fundamentals and Applications, Barcelona, Spain, September 3-5, 2019. Barcelona, Spain: European Community on Computional Methods in Applied Sciences (ECCOMAS)
Open this publication in new window or tab >>Modelling of wood under compression perpendicular to the grain with rolling shear in cross-laminated timber
2019 (English)In: Presented at COMPLAS 2019 - XV International Conference on Computational Plasticity: Fundamentals and Applications, Barcelona, Spain, September 3-5, 2019, Barcelona, Spain: European Community on Computional Methods in Applied Sciences (ECCOMAS), 2019Conference paper, Oral presentation with published abstract (Refereed)
Place, publisher, year, edition, pages
Barcelona, Spain: European Community on Computional Methods in Applied Sciences (ECCOMAS), 2019
Keywords
Compression perpendicular to the grain, Rolling shear
National Category
Wood Science Building Technologies
Research subject
Technology (byts ev till Engineering), Forestry and Wood Technology; Technology (byts ev till Engineering), Civil engineering
Identifiers
urn:nbn:se:lnu:diva-89212 (URN)
Conference
COMPLAS 2019 - XV International Conference on Computational Plasticity: Fundamentals and Applications, Barcelona, Spain, September 3-5, 2019
Available from: 2019-09-20 Created: 2019-09-20 Last updated: 2019-11-04Bibliographically approved
Muszyński, L., Akter, S. T., Nairn, J. & Bader, T. K. (2019). On the need for reliable rolling shear characteristics in CLT lamellas and for efficient related test methods. In: Bool of abstract: CompWood 2019, International Conference on Computational Methods in Wood Mechanics – from Material Properties to Timber Structures. June 17-19, 2019, Växjö, Sweden.: . Paper presented at CompWood 2019, International Conference on Computational Methods in Wood Mechanics – from Material Properties to Timber Structures. June 17-19, 2019, Växjö, Sweden.. Lnu Press
Open this publication in new window or tab >>On the need for reliable rolling shear characteristics in CLT lamellas and for efficient related test methods
2019 (English)In: Bool of abstract: CompWood 2019, International Conference on Computational Methods in Wood Mechanics – from Material Properties to Timber Structures. June 17-19, 2019, Växjö, Sweden., Lnu Press , 2019Conference paper, Oral presentation with published abstract (Refereed)
Abstract [en]

Effective modeling of structural behavior of cross-laminated timber (CLT) elements requires reliable input on the mechanical properties of its laminations. The cross-lamination of layers provides for dimensional stability of CLT elements. In this arrangement, however, all laminations in shear walls and the layers of floor elements oriented perpendicular to the major strength axis transfer shear stress in the radial–tangential plane, often referred to as rolling shear. It is among the least documented characteristics of wood, since it had been of marginal interest for structural lumber and engineered wood composites until the emergence of CLT. While the numerical models may easily account for the contribution of rolling shear in the immediate and long-term deformations of laminated panels, simulations are charged with wide margins of uncertainty because of shortage of reliable experimental data. Rolling shear is not the easiest property to measure, and it received only limited coverage in the literature [1-7]. What has been documented was that the rolling shear strength and stiffness in the cross-layers in CLT floor panels is related to the species, density, growth ring orientation, and manufacturing parameters, but there is no evidence for a meaningful correlation with the grade of lumber, whether established by visual or machine grading. In the presentation, we will discuss the pressing need for reliable data on rolling shear characteristics in clear wood and in structural lumber, their statistical distributions in species important for CLT industry, as well as for efficient test methods to allow generation of relevant data in timely manner. Prototype methods and preliminary data will be presented.

Place, publisher, year, edition, pages
Lnu Press, 2019
Keywords
CLT, Rolling shear
National Category
Construction Management
Research subject
Technology (byts ev till Engineering), Civil engineering
Identifiers
urn:nbn:se:lnu:diva-89767 (URN)978-91-88898-64-7 (ISBN)
Conference
CompWood 2019, International Conference on Computational Methods in Wood Mechanics – from Material Properties to Timber Structures. June 17-19, 2019, Växjö, Sweden.
Available from: 2019-10-22 Created: 2019-10-22 Last updated: 2019-12-04Bibliographically approved
Akter, S. T., Bader, T. K. & Enquist, B. (2018). Failure envelope for interaction of stresses perpendicular to the grain with rolling shear stress in wood. In: 6th European Conference on Computational Mechanics (ECCM 6), 7th European Conference on Computational Fluid Dynamics (ECFD 7), 11 – 15 June 2018, Glasgow, UK: . Paper presented at 6th European Conference on Computational Mechanics (ECCM 6), 7th European Conference on Computational Fluid Dynamics (ECFD 7), 11 – 15 June 2018, Glasgow, UK.
Open this publication in new window or tab >>Failure envelope for interaction of stresses perpendicular to the grain with rolling shear stress in wood
2018 (English)In: 6th European Conference on Computational Mechanics (ECCM 6), 7th European Conference on Computational Fluid Dynamics (ECFD 7), 11 – 15 June 2018, Glasgow, UK, 2018Conference paper, Oral presentation with published abstract (Refereed)
Abstract [en]

The orthotropic material property in combination with ductility in compression, brittleness in shear and tension, very low shear modulus in radial-tangential (RT) plane etc. requires anisotropic stress failure criteria, as well as their evolution with increasing strains. Three- dimensional failure criteria have been proposed for this purpose, but their validation in the RT plane with interaction of rolling shear stresses has attracted less attention. Corresponding stress interactions are however important for modelling of engineered wood-based products under compression perpendicular to the grain when taking into account influence of the annual ring structure.

The work aims at defining failure envelopes for stresses perpendicular to the grain with rolling shear stress interaction based on experimental investigations performed on Norway spruce. The experimental set-up was realized in a biaxial testing frame and consisted of stiff steel plates to transfer load from the testing machine to wood specimen. Mechanical grips prevented rotation and uplifting of the specimen in case of pure shear and tensile loading, respectively. In addition to conventional linear variable differential transformers, a digital image correlation system was used to measure strain fields on the surface of wood specimens and steel plates. Measurements of dog-bone shaped specimens were carried out along different stress interaction paths by displacement controlled loading.

The experimental dataset was then compared with commonly used phenomenological failure criteria, namely Tsai-Hill, Tsai-Wu [1], Norris [2] and Hoffman, as well as with regression equations from previous works [3].Experiments revealed that the stress-strain relationship under compression, shear, and biaxial loading differs in radial and tangential directions. None of the three-dimensional stress failure criteria provided good prediction of experiments under compression and rolling shear, but experimental data was closer to the regression equation proposed in [3].

National Category
Building Technologies
Identifiers
urn:nbn:se:lnu:diva-76228 (URN)
Conference
6th European Conference on Computational Mechanics (ECCM 6), 7th European Conference on Computational Fluid Dynamics (ECFD 7), 11 – 15 June 2018, Glasgow, UK
Available from: 2018-06-20 Created: 2018-06-20 Last updated: 2019-11-04Bibliographically approved
Akter, S. T. & Khani, M. (2013). Characterisation of laminated glass for structural applications. (Student paper). Linnéuniversitetet
Open this publication in new window or tab >>Characterisation of laminated glass for structural applications
2013 (English)Student thesis
Abstract [en]

Laminated glass (LG) consists of two or more glass layers bonded by an elasto-polymeric layer, the most commonly used being PVB (Polyvinyl Butyral). LG has improved safety properties compared with single layer glass because the interlayer prevents large sharp pieces from spreading when the glass is broken by impact. Even if one of the layers breaks, the other layer(s) still contribute in carrying the load. Through proper understanding of the interaction between the interlayer and the glass LG could be used in engineering as a load bearing material to a larger extent. This study aims at gaining a deeper knowledge of the behaviour of laminated glass by experimental investigations and by numerical model simulation. To pursue the proposed study, three point bending test with simple support conditions were performed for single layer glass and laminated glass units with three different types of interlayer materials. Corresponding finite element numerical models were created in the software ABAQUS to fit the model with experiment to obtain the bending stiffness and shear stiffness of the interlayer material. The PVB tested showed viscos-elastic material properties, whereas other two interlayer materials, Solutia DG 41 and Sentry Glass, showed linear elastic properties. PVB is the least stiff interlayer material among the three types. Solutia DG 41 and Sentry Glass have similar stiffness, about 13 to 15 times stiffer than the PVB. The behaviour of laminated glass lies in general between the two limits of a layered glass unit with no interaction and a monolithic unit of the same total thickness, depending on the stiffness of the interlayer material. Failure tests of the specimens were also carried out. The obtained strength of glass from four specimens is 80 MPa to 92 MPa with a variation of about 15%. The number of more performed experiments would have better outcome for strength of glass. The bending stiffness of the laminated glass as estimated with the numerical model fitted well with the experimental results with an error of about 2%. Hence the experimentally and numerically obtained results show a good correlation and are thought be possible to use in future larger scale modelling.

Publisher
p. 55
Keywords
Laminated glass, PVB, Sentry Glass, Bending stiffness, Bending strength
National Category
Engineering and Technology
Identifiers
urn:nbn:se:lnu:diva-26275 (URN)
External cooperation:
Thesis level
Independent thesis Advanced level (degree of Master (One Year)), 10 credits / 15 HE creditsTechnology
Presentation
2013-05-29, 09:30 (English)
Uppsok:
Technology
Supervisors
Examiners
Available from: 2013-06-12 Created: 2013-06-11 Last updated: 2019-11-04Bibliographically approved
Organisations

Search in DiVA

Show all publications