Thermoforming simulation of heat conductive plastic materials using the K-BKZ model

Landsecker, K.; Bonten, Christian

doi:10.1063/1.5088307

Cited by 5 publications

(7 citation statements)

References 6 publications

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“…The fibers can no longer slip against each other, but instead interlocking between the individual particles can occur, causing an elongation impediment. Landescker et al also confirm that particles with a reduced aspect ratio have a more favorable effect on thermoforming behavior as particles with a high aspect ratio [25,26].…”

Section: Thermoforming Processmentioning

confidence: 88%

“…In addition, the evaluation of the components does not include an evaluation of the strain and wall thickness distribution. In current investigations of Landsecker, the influence of graphite particles on the elongation behavior of high-impact polystyrene and the wall thickness distribution of 800 µm thick films is shown [25][26]. A good thermoformability was shown mainly for films filled with spherical graphite particles, whereas films filled with plate-shaped particles exhibited a reduced thermoformability.…”

Section: Introductionmentioning

confidence: 91%

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Influence of an Increased Fiber Filler Content on the Elongation Behavior of Filled Films in the Thermoforming Process

Wittmann¹

2019

AJMME

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Thermoforming belongs to one of the most important processes in polymer processing, especially in the packaging industry. It enables the forming of thermoplastic components into shaped parts at high temperatures. Since the thermoforming of films takes place in the rubbery state, amorphous thermoplastics are mainly processed, which have a wide rubbery state. Radiation crosslinking can be used to widen the thermoforming window of semi-crystalline thermoplastics. A benefit of the crosslinking is the increased short-term temperature resistance. In general, there are only a few investigations concerning the thermoforming of filled thin films. Within this investigation, the influence of an increasing glass fiber content up to 15 vol.-% as well as the effect of radiation crosslinking on the elongation behavior and the wall thickness distribution was examined. It can be summarized that especially thermoforming with an increased filler content at high areal draw ratios represents a challenge. Whereas non-crosslinked glass fiber filled films are thermoformable only at low areal draw ratios, radiation crosslinked films can be also formed at higher areal draw ratios without difficulties. For high filler contents and high areal draw ratios, no forming is possible at high areal draw ratios, although the films have been crosslinked. The use of radiation crosslinking enables the process limit in thermoforming of thin filled films to be increased and thus the range of applications to be extended greatly.

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Section: Thermoforming Processmentioning

confidence: 88%

Section: Introductionmentioning

confidence: 91%

Influence of an Increased Fiber Filler Content on the Elongation Behavior of Filled Films in the Thermoforming Process

Wittmann¹

2019

AJMME

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“…To describe this particular behavior, T-SIM use the K-BKZ type viscoelastic Wagner Model. This model shows good results for the simulation of the thermoforming process for ABS [2,4], PS [14], or HDPE [15]. The Wagner model is expressed as follows (3):…”

Section: Viscoelastic Model Parametersmentioning

confidence: 99%

Polymer-tool friction coefficient in temperature for thermoforming numerical simulation

CAUBET

2023

Materials Research Proceedings

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Abstract. In this work, friction coefficient between Polycarbonate and Aluminum was measured over the entire thermoforming temperature range by using a rotational rheometer with a specific geometry, following the B. Hegemann et al. [1] method. The effects of velocity, pressure and surface roughness were investigated. Then, numerical simulation were performed using a finite element code package for thermoforming (T-SIM®) with K-BKZ viscoelastic model. The objective of this work is to find which friction coefficient use in T-SIM simulation to be as close as possible to reality. For this, numerical simulation results for different friction coefficient were compared with experimental values to evaluate the predictive capacity. It was shown that friction coefficient is temperature dependent and rapidly increase above glass transition of polycarbonate. At room temperature, friction coefficient increases with an increase in roughness, but after glass transition, trend is reversed. Simulations with measured friction coefficients shows good agreement with experiment data.

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“…Durch Kombination des Kunststoffspritzgießens mit dem Metalldruckgießen wurde ein neuer Prozess zur Herstellung von Kunststoff-Metall-Hybriden, der besonders effektiv bei Formteilen mit komplexer Geometrie sein soll, entwickelt [7]. Neueste Übersichtsartikel sowie eine bereits früher zusammengestellte Auswahl in der Literatur beschriebener technischer Anwendungen geben einen Überblick über Metall-Kunststoff-Verbunde [8][9][10][11].…”

Section: Einleitung Und Stand Der Technikunclassified

Metal Plastic Hybrids: Optimisation in model experiments

Bräuer

Edelmann²,

Lehmann

et al. 2019

Materialwissenschaft Werkst

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Metall‐Kunststoff‐Verbunde werden als Bausteine für Leichtbaulösungen immer mehr an Bedeutung gewinnen. In dieser Arbeit wird über Modellversuche zur Optimierung der Herstellung von Dreischichtverbunden aus Stahlblech, einer Adhäsionsschicht aus einem Uretdionlack und der flexiblen Weichkomponente (thermoplastisches Polyurethan (TPU)) berichtet. Die Verbundbildung erfolgt in einem Pressverfahren. Es erfolgt sowohl eine Modifizierung der Adhäsionsschicht, als auch die Modifizierung der Weichkomponente mit dem Ziel einer Erhöhung der Verbundfestigkeit. Als quantitatives Maß dafür wird aus der im Schälversuch gemessenen Schälkraft ein „scheinbarer GIc‐Wert“ berechnet. Für Verbunde mit einer thermoplastischen Polyurethan‐Streifendicke von 2 mm wird der GIc‐Wert gegenüber dem Verbund mit unmodifizierten Komponenten um ca. 30 % auf 16 N/mm erhöht. Damit weisen diese Verbunde ähnlich hohe Verbundfestigkeiten auf wie die stabilsten Verbunde aus der Literatur. Abschließend werden die erzielten Optimierungsergebnisse hinsichtlich ihrer Bedeutung für die Interpretation des Haftungsmechanismus in der Grenzschicht Adhäsionsschicht‐thermoplastisches Polyurethan diskutiert.

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Thermoforming simulation of heat conductive plastic materials using the K-BKZ model

Cited by 5 publications

References 6 publications

Influence of an Increased Fiber Filler Content on the Elongation Behavior of Filled Films in the Thermoforming Process

Influence of an Increased Fiber Filler Content on the Elongation Behavior of Filled Films in the Thermoforming Process

Polymer-tool friction coefficient in temperature for thermoforming numerical simulation

Metal Plastic Hybrids: Optimisation in model experiments

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