Form Finding, Mechanical Modelling and Assessment

2022

1. Gil Pérez, M., Zechmeister, C., Kannenberg, F., Mindermann, P., Balangé, L., Guo, Y., Hügle, S., Gienger, A., Forster, D., Bischoff, M., Tarín, C., Middendorf, P., Schwieger, V., Gresser, G. T., Menges, A., & Knippers, J. (2022). Computational co-design framework for coreless wound fibre-polymer composite structures. Journal of Computational Design and Engineering, 9, Article 2. https://doi.org/10.1093/jcde/qwab081
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   BibTeX

   @article{Gil_Perez_2022, abstract = {In coreless filament winding, resin-impregnated fibre filaments are wound around anchor points without an additional mould. The final geometry of the produced part results from the interaction of fibres in space and is initially undetermined. Therefore, the success of large-scale coreless wound fibre composite structures for architectural applications relies on the reciprocal collaboration of simulation, fabrication, quality evaluation, and data integration domains. The correlation of data from those domains enables the optimization of the design towards ideal performance and material efficiency. This paper elaborates on a computational co-design framework to enable new modes of collaboration for coreless wound fibre–polymer composite structures. It introduces the use of a shared object model acting as a central data repository that facilitates interdisciplinary data exchange and the investigation of correlations between domains. The application of the developed computational co-design framework is demonstrated in a case study in which the data are successfully mapped, linked, and analysed across the different fields of expertise. The results showcase the framework’s potential to gain a deeper understanding of large-scale coreless wound filament structures and their fabrication and geometrical implications for design optimization.}, author = {Gil Pérez, M and Zechmeister, C and Kannenberg, F and Mindermann, P and Balangé, L and Guo, Y and Hügle, S and Gienger, A and Forster, D and Bischoff, M and Tarín, C and Middendorf, P and Schwieger, V and Gresser, G T and Menges, A and Knippers, J}, doi = {10.1093/jcde/qwab081}, journal = {Journal of Computational Design and Engineering}, month = {04}, note = {M. Gil Perez and C. Zechmeister: first authors equal contribution. F. Kannenberg and P. Mindermann: second authors equal contribution.}, number = 2, pages = {310--329}, publisher = {Oxford University Press ({OUP})}, title = {Computational co-design framework for coreless wound fibre-polymer composite structures}, url = {https://doi.org/10.1093%2Fjcde%2Fqwab081}, volume = 9, year = 2022 }
2. Gil Pérez, M., Guo, Y., & Knippers, J. (2022). Integrative material and structural design methods for natural fibres filament-wound composite structures: The LivMatS pavilion. Materials & Design, 217, 110624. https://doi.org/10.1016/j.matdes.2022.110624
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   BibTeX

   @article{Gil_Perez_2022, abstract = {Coreless filament winding (CFW) is a novel fabrication technique that utilises fibre-polymer composite materials to efficiently produce filament wound structures in architecture while reducing manufacturing waste. Previous projects have been successfully built with glass and carbon fibre, proving their potential for lightweight construction systems. However, in order to move towards more sustainable architecture, it is crucial to consider replacing carbon fibre’s high environmental impact with other material systems, such as natural fibre. This paper evaluates several fibres, resin systems, and their required CFW fabrication adjustments towards designing and fabricating a bio-composite structure: the LivMatS Pavilion. The methods integrate structural design loops with material evaluation and characterisation, including small-scale and large-scale structural testing at progressive stages. The results demonstrate the interactive decision-making process that combines material characterisation with structural simulation feedback, leveraged to evaluate and optimise the structural design. The built pavilion is proof of the first successful coreless filament wound sustainable natural fibres design, and the developed methods and findings open up further research directions for future applications.}, author = {Gil Pérez, Marta and Guo, Yanan and Knippers, Jan}, doi = {10.1016/j.matdes.2022.110624}, issn = {0264-1275}, journal = {Materials & Design}, month = {05}, pages = 110624, publisher = {Elsevier {BV}}, title = {Integrative material and structural design methods for natural fibres filament-wound composite structures: The LivMatS pavilion}, url = {https://doi.org/10.1016%2Fj.matdes.2022.110624}, volume = 217, year = 2022 }
3. Guo, Y., Gil Pérez, M., Serhat, G., & Knippers, J. (2022). A design methodology for fiber layup optimization of filament wound structural components. Structures, 38, 1125–1136. https://doi.org/10.1016/j.istruc.2022.02.048
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   BibTeX

   @article{Guo_2022, abstract = {The applications of fiber-reinforced polymer (FRP) composites extend rapidly along with the development of new manufacturing techniques. However, due to the complexities introduced by the material and fabrication processes, the application of conventional structural design methods for construction members has been significantly challenging. This paper presents an alternative methodology to find optimum fiber layups for a given tube-shape geometry via a graphical optimization strategy based on structural performance requirements. The proposed technique employs simplified shell element models based on classical lamination theory (CLT) to avoid explicit fiber modeling in the FEA simulations. Lamination parameters are utilized to generate the reduced stiffness matrices for continuous multi-layer FRP lamination. The fiber layup of the component is retrieved from the optimal lamination parameters that maximize the structural performance. The case study results demonstrate that the developed method provides compact solutions, linking the structural design requirements with optimal fiber orientations and volumetric proportions. In addition, the determined solutions can be interpreted directly by the winding fabrication settings.}, author = {Guo, Yanan and Gil Pérez, Marta and Serhat, Gokhan and Knippers, Jan}, doi = {10.1016/j.istruc.2022.02.048}, journal = {Structures}, month = {04}, pages = {1125--1136}, publisher = {Elsevier {BV}}, title = {A design methodology for fiber layup optimization of filament wound structural components}, url = {https://doi.org/10.1016%2Fj.istruc.2022.02.048}, volume = 38, year = 2022 }
4. Guo, Y., Serhat, G., Gil Pérez, M., & Knippers, J. (2022). Maximizing buckling load of elliptical composite cylinders using lamination parameters. Engineering Structures, 262, 114342. https://doi.org/10.1016/j.engstruct.2022.114342
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   BibTeX

   @article{Guo_2022, abstract = {Structural members made of fiber-reinforced polymers (FRP) attract increasing attention in the development of novel architectural systems that challenge the standard design methodologies. Cylindrical surfaces constitute one of the typical geometric sets obtained with the FRP component fabrication. This paper explores the influences of two geometric parameters on the buckling performance of elliptical cylinders: inverse slenderness (ratio of minimum diameter to height) and eccentricity (ratio of radii along semi-axes). The overall stiffness properties are defined using lamination parameters. This analysis method eliminates the dependency of optimal solutions on the initial assumptions regarding the laminate configuration, which needs to be explicitly described in multi-layer modeling. Finite element analyses are utilized to compute buckling loads of the cylinders under axial compression force and bi-axial bending moments. The optimal lamination parameters and buckling stresses are determined for various parameters, and the lamination parameters corresponding to the optimal and simple [±45°] angle-ply design points are presented in the lamination parameter plane via Miki's diagram. The results reveal the level of performance that can be achieved by a specific geometry and provide guidelines for the optimal design of elliptical laminated cylinders against buckling.}, author = {Guo, Yanan and Serhat, Gokhan and Gil Pérez, Marta and Knippers, Jan}, doi = {10.1016/j.engstruct.2022.114342}, issn = {0141-0296}, journal = {Engineering Structures}, month = {07}, pages = 114342, publisher = {Elsevier}, title = {Maximizing buckling load of elliptical composite cylinders using lamination parameters}, url = {https://www.sciencedirect.com/science/article/pii/S014102962200459X}, volume = 262, year = 2022 }
5. Oesterle, B., Geiger, F., Forster, D., Fröhlich, M., & Bischoff, M. (2022). A study on the approximation power of NURBS and the significance of exact geometry in isogeometric pre-buckling analyses of shells. Computer Methods in Applied Mechanics and Engineering, 397, Article 115144. https://doi.org/10.1016/j.cma.2022.115144
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   BibTeX

   @article{oesterle2022study, abstract = {We present a comprehensive study on the approximation power of NURBS and the significance of exact geometry in stability analyses of shells. Pre-buckling analyses are carried out to estimate the critical load levels and the initial buckling patterns. Various finite element solutions obtained with the commercial code ANSYS are compared with solutions from the isogeometric version of the finite element method, using our in-house code NumPro. In some problem setups, the isogeometric shell elements provide superior accuracy compared to standard (as opposed to isogeometric) shell finite elements, requiring only a fractional amount of degrees of freedom for the same level of accuracy. The present study systematically investigates the sources of this superior accuracy of the isogeometric approach. In particular, hypotheses are tested concerning the influence of exact geometry and smoothness of splines.}, author = {Oesterle, Bastian and Geiger, Florian and Forster, David and Fröhlich, Manuel and Bischoff, Manfred}, doi = {10.1016/j.cma.2022.115144}, journal = {Computer Methods in Applied Mechanics and Engineering}, number = 115144, title = {A study on the approximation power of NURBS and the significance of exact geometry in isogeometric pre-buckling analyses of shells}, volume = 397, year = 2022 }