Wolter, Nick
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Item-typ:Veröffentlichung, The effects of manufacturing processes on the physical and mechanical properties of basalt fibre reinforced polybenzoxazine(Elsevier Science, 2021-01-23); ; ; ; The present work provides a comparative investigation between different methods of manufacturing basalt fibre reinforced polybenzoxazines (BFRP), including vacuum infusion, hand laminating, dynamic fluid compression moulding and autoclave curing processes. In comparison to the high pressure based autoclave-cured and compression-moulded BFRPs, vacuum-infused BFRPs showed similar or even higher mechanical properties. Despite the low pressure curing, vacuum infusion yielded BFRPs with a 10% higher tensile strength and a 24% higher strain at failure compared to its autoclave-cured counterparts. Thus, it is possible to gain BFRPs with near-zero porosity and high mechanical properties without the need of high pressure curing methods.Wissenschaftlicher Artikel146 264 - Some of the metrics are blocked by yourconsent settings
Item-typ:Veröffentlichung, Auswirkungen von Einzelkomponenten auf die Verarbeitung sowie auf die mechanischen Eigenschaften und das Brandverhalten polybenzoxazinbasierter Faserverbundwerkstoffe(2021-08-27); ; ; Im Fokus dieser Arbeit steht die Erforschung und Entwicklung von thermisch stabilen Faser-Kunststoff-Verbunden (FKV) auf Basis von Polybenzoxazin und phosphorhaltigen Flammschutzmitteln sowie die dazugehörigen Fertigungs- und Fügeverfahren. Im Zuge dieser Arbeit wird ein Verständnis zum Einfluss von unterschiedlicher Einzelkomponenten und deren Wechselwirkungen sowie von unterschiedlichen Fertigungs- und Fügeverfahren auf die Verarbeitungs- und Materialeigenschaften aufgebaut. Durch eine modellhafte Beschreibung des Einflusses der Materialzusammensetzung und der Fertigungsverfahren auf die Verarbeitungs- und Materialeigenschaften sowie durch die Darstellung der komplexen Wechselwirkungen zwischen den mechanischen und Brandeigenschaften wird es in der Zukunft möglich sein, die Eigenschaften von polybenzoxazinbasierten FKV gezielt einzustellen.Dissertation299 631 - Some of the metrics are blocked by yourconsent settings
Item-typ:Veröffentlichung, Effect of aluminium substrate thickness on the lap-shear strength of adhesively bonded and hybrid riveted-bonded jointsFor lightweight materials, e.g. aluminium, the definition of proper joining technology relies on material properties, as well as design and manufacturing aspects. Substrate thickness is especially relevant due to its impact on the weight of components. The present work compares the performance of adhesively bonded (AJ) to hybrid riveted-bonded joints (HJ) using aluminium substrates. To assess the lightweight potential of these joining methods, the effect of substrate thickness (2 and 3 mm) on the lap-shear strength (LSS) of single lap joints is investigated. An epoxy-based structural adhesive is employed for bonding, whilst HJs are produced by lockbolt rivet insertion into fully cured adhesive joints. The stiffness of joints increased with an increase of substrate thickness. HJs presented two-staged failure process with an increase in energy absorption and displacement at break. For HJs, the substrate thickness changed the failure mechanism of rivets: with thicker substrates failure occurred due to shear, whereas in thinner substrates due to rivet pulling-through. The LSS of 2 mm and 3 mm-thick AJs is similar. With 2 mm-thick substrates, the LSS of HJs was lower than AJs. In contrast, the highest LSS is obtained by the 3 mm-thick HJs. The highest lightweight potential, i.e. LSS divided by weight, is achieved by the 2 mm-thick AJs, followed by the 3 mm-thick HJs with a loss of ca. 10% of specific LSS.Wissenschaftlicher ArtikelBand:237Heft:322 30 - Some of the metrics are blocked by yourconsent settings
Item-typ:Veröffentlichung, Adhesively- and hybrid- bonded joining of basalt and carbon fibre reinforced polybenzoxazine-based compositesPolybenzoxazines-based composites are an excellent alternative in lightweight design due to their outstanding properties in terms of chemical stability, inherent flame resistance, as well as mechanical performance. The present work provides an investigation of different joining techniques for polybenzoxazine-based composites, namely adhesively - and hybrid bonded joining. The effects of fibre reinforcement (carbon or basalt), and substrate thickness (2 or 3 mm) on the lap-shear strength of joints are taken into consideration. Here, basalt (BFRP) and carbon fibre reinforced plastics (CFRP) were manufactured by vacuum infusion technique followed by a convection oven curing. Mechanical characterisation of substrates included tensile and interlaminar shear strength testing. Hybrid joints were fabricated by rivet insertion in cured joints bonded with a structural adhesive. Adhesive bonding showed to be a proper joining technique presenting a good adhesion with substrates, and adequate cohesive strength. Hybrid bonded joints had a fail-safe fracture and higher energy absorption prior to failure than their adhesively bonded counterparts. No effect of substrate thickness on lap-shear strength was observed. The dominating failure mechanism for the joints was the delamination of the topmost-layer due to peel stresses. CFRP joints exhibited higher lap-shear strength than BFRP joints, which was consistent with interlaminar shear strength results.Wissenschaftlicher ArtikelBand:23659 24