Search

Your search keyword '"Linke, B"' showing total 16 results
Start Over Author "Linke, B" Publication Year Range Last 3 years
16 results on '"Linke, B"'

6. Effect of alloying and microstructure on formability of advanced high-strength steels processed via quenching and partitioning

Author

Xia, P. (author), Vercruysse, F. (author), Celada-Casero, Carola (author), Verleysen, P. (author), Petrov, R.H. (author), Sabirov, I. (author), Molina-Aldareguia, J. M. (author), Smith, A. (author), Linke, B. (author), Frometa, D. (author), Xia, P. (author), Vercruysse, F. (author), Celada-Casero, Carola (author), Verleysen, P. (author), Petrov, R.H. (author), Sabirov, I. (author), Molina-Aldareguia, J. M. (author), Smith, A. (author), Linke, B. (author), and Frometa, D. (author)

Abstract

The article focuses on the effect of alloying and microstructure on formability of advanced high strength steels (AHSSs) processed via quenching and partitioning (Q&P). Three different Q&P steels with different combination of alloying elements and volume fraction of retained austenite are subjected to uniaxial tensile and Nakajima testing. Tensile mechanical properties are determined, and the forming limit diagrams (FLDs) are plotted. Microstructure of the tested samples is analyzed, and dramatic reduction of retained austenite fraction is detected. It is demonstrated that all steels are able to accumulate much higher amount of plastic strain when tested using Nakajima method. The observed phenomenon is related to the multiaxial stress state and strain gradients through the sheet thickness resulting in a fast transformation of retained austenite, as well as the ability of the tempered martensitic matrix to accumulate plastic strain. Surprisingly, a Q&P steel with the highest volume fraction of retained austenite and highest tensile ductility shows the lowest formability among studied grades. The latter observation is related to the highest sum of fractions of initial fresh martensite and stress/strain induced martensite promoting formation of microcracks. Their role and ability of tempered martensitic matrix to accumulate plastic deformation during forming of Q&P steels is discussed., Green Open Access added to TU Delft Institutional Repository 'You share, we take care!' - Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public., Team Maria Santofimia Navarro, Team Kevin Rossi

Published
2022
Full Text
View/download PDF

13. 20 - Zirconia Strength Degradation Post Air-Abrasion of Veneering and Cementation Surfaces.

Author

Butler, S., Linke, B., Moreira, N.C.F., and Nychka, J.A.

Subjects
*SURFACE preparation, *FLEXURAL strength, *ZIRCONIUM oxide, *BEND testing, *SAND blasting
Abstract

This study evaluated how the flexural strength of a zirconia-based ceramic (Y-TZP) was affected by air abrasion with 30 μm SiO on both zirconia surfaces: the cementation surface, and the veneering surface. Translucent Y-TZP ceramic bars, for four-point bend testing, were prepared and divided considering the compressive (surface treatment for cementation) and tensile surfaces (surface treatment for veneering). Sandblasting was performed or not for each compressive and tensile surfaces. The specimens from all experimental conditions were analysed by SEM. All specimens were tested in four-point bending. Data were statistically analysed using one-way ANOVA and Post Hoc tests (α= 0.05). A Weibull analysis was used to analyse the strength reliability. According to the results of this investigation, the flexural strength was significantly affected by sandblasting on both surfaces: for veneering (P < 0.001) and for cementation (P < 0.001). Sandblasting the veneering surface, to improve bonding of the veneer to Y-TZP, negatively impacted strength reliability. Sandblasting the cementation surface decreased the flexural strength while increasing the strength reliability. [ABSTRACT FROM AUTHOR]

Published
2022
Full Text
View/download PDF

14. Proceedings of the 3rd Conference on Physical Modeling for Virtual Manufacturing Systems and Processes

Author

Aurich, Jan C., Garth, Christoph, and Linke, Barbara S.

Subjects
Numerical and Analytical Modeling, Material Behavior and Tribological Aspects in Cutting, Precision, Ultra-Precision and Micro-Machining, Additive Manufacturing, Multiphysics and Multiscale Modeling, Dynamics and Stability of Machining, Optimisation and Visualization of Machining Processes, Thermal Effects and Part Distorsion, Design, Simulation and Modeling, Intelligent Manufacturing Systems, Factory design, Reconfigurability and Integration, Visualization and Virtual Reality for Manufacturing, Energy and Resource Efficient Manufacturing, Sustainable Manufacturing, Human Factors in Intelligent Manufacturing Systems, bic Book Industry Communication::T Technology, engineering, agriculture::TG Mechanical engineering & materials::TGP Production engineering
Abstract

This is an open access book reporting the results of nine years research of the International Research Training Group (IRTG) 2057, funded by the German Research Foundation (DFG). The IRTG is a joint venture between the TU Kaiserslautern, the University of California Berkeley, and University of California Davis. The book is content-driven mainly by two disciplines: engineering and computer science. Through the application of scientific knowledge and advanced computer-based methods in conjunction with physical models on a level unrealized in the past, technologies and methods are promoted, which can be used for planning and optimization of manufacturing systems and processes. As a result, fundamental understanding as well as extensive systems, tools and computational algorithms, which significantly improve the integration of advanced computational methods for solving problems of manufacturing systems and processes will be available. This open access book is of interest to any researcher dealing with process and factory planning in manufacturing, like for cutting and additive manufacturing.

Published
2023
Full Text
View/download PDF

16. 54 - Fracture Strength of CAD/CAM CROWNS after Enhancement of Occlusal Morphology.

Author

Passos, L., Butler, S., Torrealba, Y., and Linke, B.

Subjects
*FRACTURE strength, *DENTAL crowns, *MANN Whitney U Test, *ELASTIC modulus, *CAD/CAM systems
Abstract

The aim of this study was to investigate the fracture strength of computer-aided design/computer-aided manufacturing (CAD/CAM) posterior ceramic crowns with and without post-milling manual enhancement of occlusal morphology (MEOM), as indicated especially with early CAD/ CAM restorations that have limited capacity to generate natural occlusal morphology. A mandibular molar of an acrylic tooth model was prepared to receive a CAD/CAM all-ceramic crown and was used as a master die to fabricate 80 prepared tooth replicas using an epoxy resin with an elastic modulus (E) of 18 GPa. The crown was designed using CEREC softwares Biogeneric Copy Design mode (Sirona). Eighty identical monolithic crowns were fabricated by milling four types of ceramic blocks. Forty monolithic crowns (10 of each ceramic system) were randomly selected as the control group, and MEOM was performed for each of the other 40 crowns by a certified dental technician. Restorations were crystallized and glazed according to the manufacturers instructions and firing protocols. All crowns were cemented to their respective die using resin cement and loaded to fracture at a crosshead speed of 0.5 mm/min. The resultant fractures were classified into three modes. Data were statistically analyzed using the nonparametric Mann-Whitney U test at ? = 0.05. The MEOM treatment decreased the fracture load for all ceramic brands. The MEOM procedure should be considered detrimental for monolithic CAD/CAM-generated crowns and should thus be avoided. [Display omitted] [ABSTRACT FROM AUTHOR]

Published
2022
Full Text
View/download PDF

Catalog

Books, media, physical & digital resources
See catalog results