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1 – 10 of over 1000Juan Esteban Aponte Gonzalez, William Jordan Wright, Raden Gustinvil and Emrah Celik
Direct ink writing (DIW) is a robust additive manufacturing technology for the fabrication of fiber-reinforced thermoset composites. However, this technique is currently limited…
Abstract
Purpose
Direct ink writing (DIW) is a robust additive manufacturing technology for the fabrication of fiber-reinforced thermoset composites. However, this technique is currently limited to low design complexity and minimal heights. This study aims to investigate the feasibility of UV-assisted DIW of composites to enhance the green-part strength of the printed inks and resolve the complexity and the height limitations of DIW technology.
Design/methodology/approach
The experimental approach involved the preparation of the thermoset inks that are composed of nanoclay, epoxy, photopolymer and glass fiber reinforcement. Composite specimens were fabricated in complex geometries from these ink feedstocks using UV-assisted, hybrid 3D-printing technology. Fabricated specimens were characterized using optical microscopy, three-point bending mechanical tests and numerical simulations.
Findings
The introduced hybrid, UV-assisted 3D-printing technology allowed the fabrication of tall and overhanging thermoset composite structures up to 30% glass fiber reinforcement without sagging during or after printing. Glass fiber reinforcement tremendously enhanced the mechanical performance of the composites. UV-curable resin addition led to a reduction in strength (approximately 15%) compared to composites fabricated without UV resin. However, this reduction can be eliminated by increasing the glass fiber content within the hybrid thermoset composite. Numerical simulations indicate that the fiber orientation significantly affects the mechanical performance of the printed composites.
Originality/value
This study showed that the fabrication of high-performing thermoset composites in complex geometries was possible via hybrid DIW technology. This new technology will tremendously expand the application envelope of the additively manufactured thermoset composites and the fabrication of large composite structures with high mechanical performance and dimensional freedom will benefit various engineering fields including the fields of aerospace, automotive and marine engineering.
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The TULIP (The University Licensing Program) project offered the University of Washington (UW) a chance to explore document distribution enhancements to our existing campus…
Abstract
The TULIP (The University Licensing Program) project offered the University of Washington (UW) a chance to explore document distribution enhancements to our existing campus information services. Materials science, the focus of the project, is an active research area in several engineering and physical science academic departments on campus. The core research community numbers approximately 75 faculty, 25 post‐doctoral research workers, and 250 graduate students; perhaps three times that many are working in related fields. The University Libraries subscribes to 39 of the TULIP journal titles, with holdings distributed among five campus libraries.
In the March 1983 issue of the Moral Majority Report, Jerry Falwell, one of the leaders of the new right movement, leveled a very serious charge at librarians: they are failing to…
Abstract
In the March 1983 issue of the Moral Majority Report, Jerry Falwell, one of the leaders of the new right movement, leveled a very serious charge at librarians: they are failing to include “conservative” materials in their collections. According to him,
The immigration, crime, and justice nexus holds a special place in the history of criminology. It is one of the oldest, longest running, and ideologically conflicted focal…
Abstract
The immigration, crime, and justice nexus holds a special place in the history of criminology. It is one of the oldest, longest running, and ideologically conflicted focal concerns in the discipline. Its lineage reflects the field's record of scholarly innovation in methodology and theory as well as the development of related subjects of special interest, such as victimology and its subfields, domestic violence, human trafficking, hate crime, victim–offender relationships, and other related topics such as community policing and transnational crime and justice.
About two years ago we took a random sample of reports on legal proceedings received at the offices of this journal over a period of three months to illustrate changing trends in…
Abstract
About two years ago we took a random sample of reports on legal proceedings received at the offices of this journal over a period of three months to illustrate changing trends in food offences. This drew attention to the enormous increase in prosecutions for the presence of foreign bodies in foods and to the almost complete disappearance of frank adulteration cases. Now we present another random sample consisting of all the reports of legal proceedings received for the three months April, May and June of this year. They obviously are not all the cases brought before the Courts in that period, but are nonetheless a broad selection and give a reasonably accurate picture for the whole country. As before, the results have been tabulated and “foreign body” cases dominate the scene and all except one have been brought under Section 2, Food & Drugs Act, 1955. In the last report, 15.6 per cent had been brought under Section 8. This section appears to have limited use nowadays; offences relating to the sale of food in a state of unsoundness or decomposition are for the most part brought under Section 2.
THE popular image of Ireland is of a land where one can enjoy the perfect holiday. If you are a golfer, fisherman, rambler or if you just enjoy good food and of course the black…
Abstract
THE popular image of Ireland is of a land where one can enjoy the perfect holiday. If you are a golfer, fisherman, rambler or if you just enjoy good food and of course the black nectar for which it is famous, then Ireland is the place to go, take the word of TV Chef, Keith Floyd. Ireland however, unlike many small countries, is not content to base its economy on tourism.
Air Commodore F. R. Banks, C.B., C.B.E., has accepted the invitation of Lord Pakenham, Minister of Civil Aviation, to join the Air Safety Board.
Charles T. Rasmussen and Rick Tilman
Discusses the correspondence and use of each other′s ideas of Loeband Veblen which are seen to be significant both in understanding theevolution of their own thought and as…
Abstract
Discusses the correspondence and use of each other′s ideas of Loeb and Veblen which are seen to be significant both in understanding the evolution of their own thought and as commentary on the times.
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