Tung Pham
University of Innsbruck
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Publication
Featured researches published by Tung Pham.
Polymer | 2003
H.H. Le; Th. Lüpke; Tung Pham; Hans-Joachim Radusch
The analysis of the stress relaxation behavior of thermoplastic elastomers (TPE) was made with the help of the two-components model, which allows a consistent description of the time and temperature dependent behavior. The effect of draw ratio, strain rate and temperature on the stress relaxation behavior of TPE was investigated. The structural background of the relaxation behavior was discussed using the two-network model shown in form of an analogy model. The assignation of the stress components to a hard phase and soft phase network is based on the experimental results taking into consideration the knowledge about the structural nature and deformation performance of TPE. Comparing dynamic vulcanizates with different TPE based on block copolymer, it was found that the characteristic differences in the time-dependent deformation behavior of the different TPE are based on the different deformation behavior of the network points.
Proceedings of the Institution of Mechanical Engineers, Part E: Journal of Process Mechanical Engineering | 2011
Tham Nguyen-Chung; C Löser; Gábor Jüttner; Tung Pham; M Obadal; M Gehde
The software package Moldflow Plastics Insights was used to simulate the filling of a micro-cavity by considering precise material data and accurate boundary conditions. Experiments were carried out on an accurately controlled micro-injection moulding machine (formicaPlast) for providing important parameters to verify the simulation results and improve the accuracy of the simulation. Based on the relationship between the cavity pressure and the mould-filling ratio, the heat transfer coefficients can be appropriately determined for different process conditions. Finally, the transient thermo-rheological results were analysed with regard to their influence on the morphology of semi-crystalline (PP) micro-injection moulded parts, which not only give rise to the mechanisms of the morphological formation but also verify the quality of the simulation results.
THE XV INTERNATIONAL CONGRESS ON RHEOLOGY: The Society of Rheology 80th Annual#N#Meeting | 2008
Tham Nguyen-Chung; Gábor Jüttner; Tung Pham
Growing demands in the manufacturing of micro and precision components in plastics require new concepts for molding machines and micro molds on the one hand. On the other hand, a deeper understanding of the filling and solidification process in a micro mold is indispensable. In this work, the filling process of a micro spiral was analyzed by modeling the compressible flow using pressure dependent viscosity and adjusted heat transfer coefficients. At the same time, experimental filling studies were carried out on an accurately controlled micro‐injection molding machine. Based on the relationship between the injection pressure and the filling degree, essential factors for the quality of the simulation can be identified. It can be shown that the flow behavior of the melt in a micro cavity of high aspect ratio is extremely dependent on the melt compressibility in the injection cylinder which needs to be considered in the simulation in order to predict an accurate flow rate. Moreover, the heat transfer coefficients between the melt and the mold wall vary significantly when changing cavity thickness and processing conditions. It is believed that a pressure dependent model for the heat transfer coefficient would be able to improve the quality of the process simulation.
Cellulose | 2018
Michael Cordin; Thomas Bechtold; Tung Pham
Natural fibre reinforced plant structures are widely used in nature. These plant structures combine light weight with superior mechanical properties. The fibre orientations in plants are optimized to the occurring forces, especially to the bending of plants by wind forces. Therefore it is important to study the effect of fibre orientation to the mechanical properties of materials in a systematic experimental approach. In this study the effect of reinforcement fibre orientation on mechanical properties of bio-based lyocell-reinforced polypropylene composite was analysed. For this purpose, special technique to produce composites with defined fibre orientation and fibre wetting was developed consisting of the production of intermingled hybrid yarn followed by defined yarn laying and thermoforming processes. The formed composites were subjected to tensile strength tests and dynamic mechanical analyses. The experimentally determined E-modulus was compared with values, calculated from the modified rule of mixture of Virk and Krenchel. The analysis showed that the experimental E-moduli were somewhat smaller than the theoretical values, which is indicative of a less than perfect interfacial bonding between the fibres and matrix. The influence of water on the composite performance was also analysed. It was shown that the composites sorb approximately 30% water by weight, and it has a strong influence on the E-modulus and other performance parameters.Graphical abstract
Polymer | 2014
H.H. Le; S. Abhijeet; S. Ilish; J. Klehm; S. Henning; M. Beiner; S.S. Sarkawi; Wilma K. Dierkes; Amit Kumar Das; D. Fischer; Klaus-Werner Stöckelhuber; S. Wiessner; S.P. Khatiwada; Rameshwar Adhikari; Tung Pham; Gert Heinrich; Hans-Joachim Radusch
Archive | 2008
Tung Pham; Markus Gahleitner
Polymer Engineering and Science | 2010
Tham Nguyen-Chung; Gábor Jüttner; Cindy Löser; Tung Pham; Michael Gehde
Polymer | 2011
H.H. Le; M. Schoß; S. Ilisch; Uwe Gohs; Gert Heinrich; Tung Pham; Hans-Joachim Radusch
Archive | 2007
Markus Gahleitner; Nina Ackermans; Tung Pham; Espen Ommundsen; Christelle Grein; Doris Machl
Polymer | 2015
H.H. Le; Tung Pham; Sven Henning; J. Klehm; Sven Wießner; Klaus-Werner Stöckelhuber; Amit Kumar Das; X.T. Hoang; Quang Khang Do; M. Wu; N. Vennemann; Gert Heinrich; Hans-Joachim Radusch