WC
W.J. Chen
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3 records found
1
Computational modelling of impact in architected materials
A finite element framework for contact and fracture in beam lattices
Truss metamaterials have exceptional specific energy absorption performance, making them prime candidates for advanced impact protection in high-performance sectors such as aerospace. The ability to numerically model impact problems involving truss metamaterials can prove to be highly beneficial in terms of cost and time savings during the design process.
Modelling truss-metamaterial impact problems generally requires accounting for strut dynamics, possible fragmentation and subsequent self-contact events between beam struts and fragments. However, coupling beam-fracture and beam-contact models is challenging because beam elements sharing an interface may experience non-physical contact, and propagating the contact dynamics to all beam elements is more complicated in a model with fracture than one without.
This thesis aims to develop high-fidelity dynamic impact simulations of beam lattices capturing both strut self-contact and fracture behaviour. To this end, a unified beam-contact-fracture computational framework was developed, tested in numerical experiments, and demonstrated on a large-scale truss-metamaterial impact problem. The simulation results are presented and discussed. The thesis closes out by pointing out areas for future improvements in robustness, validity and accuracy.
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Modelling truss-metamaterial impact problems generally requires accounting for strut dynamics, possible fragmentation and subsequent self-contact events between beam struts and fragments. However, coupling beam-fracture and beam-contact models is challenging because beam elements sharing an interface may experience non-physical contact, and propagating the contact dynamics to all beam elements is more complicated in a model with fracture than one without.
This thesis aims to develop high-fidelity dynamic impact simulations of beam lattices capturing both strut self-contact and fracture behaviour. To this end, a unified beam-contact-fracture computational framework was developed, tested in numerical experiments, and demonstrated on a large-scale truss-metamaterial impact problem. The simulation results are presented and discussed. The thesis closes out by pointing out areas for future improvements in robustness, validity and accuracy.
...
Truss metamaterials have exceptional specific energy absorption performance, making them prime candidates for advanced impact protection in high-performance sectors such as aerospace. The ability to numerically model impact problems involving truss metamaterials can prove to be highly beneficial in terms of cost and time savings during the design process.
Modelling truss-metamaterial impact problems generally requires accounting for strut dynamics, possible fragmentation and subsequent self-contact events between beam struts and fragments. However, coupling beam-fracture and beam-contact models is challenging because beam elements sharing an interface may experience non-physical contact, and propagating the contact dynamics to all beam elements is more complicated in a model with fracture than one without.
This thesis aims to develop high-fidelity dynamic impact simulations of beam lattices capturing both strut self-contact and fracture behaviour. To this end, a unified beam-contact-fracture computational framework was developed, tested in numerical experiments, and demonstrated on a large-scale truss-metamaterial impact problem. The simulation results are presented and discussed. The thesis closes out by pointing out areas for future improvements in robustness, validity and accuracy.
Modelling truss-metamaterial impact problems generally requires accounting for strut dynamics, possible fragmentation and subsequent self-contact events between beam struts and fragments. However, coupling beam-fracture and beam-contact models is challenging because beam elements sharing an interface may experience non-physical contact, and propagating the contact dynamics to all beam elements is more complicated in a model with fracture than one without.
This thesis aims to develop high-fidelity dynamic impact simulations of beam lattices capturing both strut self-contact and fracture behaviour. To this end, a unified beam-contact-fracture computational framework was developed, tested in numerical experiments, and demonstrated on a large-scale truss-metamaterial impact problem. The simulation results are presented and discussed. The thesis closes out by pointing out areas for future improvements in robustness, validity and accuracy.
Bachelor thesis
(2024)
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R.S.P. Beekman, N.A.C. Burgers, W.J. Chen, C.M. Cook, J.S. Dinesen, L. Jordan, I.A.O. Kramer, H.K. Niemczyk, S. Palac, T.L. van Soest, C.D. Rans, P. Proesmans, F. Neri
The FireFly is a multi-role VTOL firefighting aircraft. It was designed with a water tank capacity of 10,000 L and a dash speed of over 400 kph. The aircraft is capable of refilling the water tank with help of a snorkel device connected to the tank whilst flying in hover.
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The FireFly is a multi-role VTOL firefighting aircraft. It was designed with a water tank capacity of 10,000 L and a dash speed of over 400 kph. The aircraft is capable of refilling the water tank with help of a snorkel device connected to the tank whilst flying in hover.
Bachelor thesis
(2022)
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M.J. van Laar, V.P. Petrov, S.C.P. Wijnands, D.S. Taraczky, J. Smeets, S. Rooze, T.S. Vermeulen, R. Vaznelytė, D.S. Ruijs, W.J. Chen, F. Avallone, F. Beltrame, N. Yue, L.J. Dijkstra
The final report focused on the detailed design of the final chosen concept, which is a BWB aircraft with a distributed propulsion system powered by liquid hydrogen. Before doing the actual technical design part, a market analysis is made to investigate the future demand for this type of aircraft. To do so, the SWOT analysis, market characteristics, and competitor analysis are made. After that, an estimation of the market dynamics & trends, as well as the expected demand for the aircraft is made. In financial analysis, the financial forecast and strategies for the whole aircraft program are discussed, from which the unit cost, operational cost, return on investment and cost-breakdown structure can be found. The report concludes that the Lightning2 program is a promising step towards more sustainable aviation. It emphasizes the need for further development and adaptation to technological advancements to maintain a competitive position in the market
...
The final report focused on the detailed design of the final chosen concept, which is a BWB aircraft with a distributed propulsion system powered by liquid hydrogen. Before doing the actual technical design part, a market analysis is made to investigate the future demand for this type of aircraft. To do so, the SWOT analysis, market characteristics, and competitor analysis are made. After that, an estimation of the market dynamics & trends, as well as the expected demand for the aircraft is made. In financial analysis, the financial forecast and strategies for the whole aircraft program are discussed, from which the unit cost, operational cost, return on investment and cost-breakdown structure can be found. The report concludes that the Lightning2 program is a promising step towards more sustainable aviation. It emphasizes the need for further development and adaptation to technological advancements to maintain a competitive position in the market