Untersuchungen zur Dehnrheologie und Verarbeitbarkeit von Halbzeugen beim Thermoformen sowie Simulation und Optimierung der Umformphase

This thesis focuses on the influence of the material rheology on the quality and the prediction and optimisation of the wall thickness distribution of thermoformed parts. In particular, the technique of the Membrane-Inflation Rheometer was improved. In this rheological test thermoplastic samples are deformed in an equibiaxial strain mode under process relevant conditions for temperature and strain rate. The rheological properties of thermoforming sheets were correlated with the quality of thermoformed parts. The rheological data was additionally used to calibrate a viscoelastic material model. The material constants are used as input for Finite-Element-Analysis of the deformation step in the thermoforming process. Based on the simulation of deformation in the thermoforming process, an optimisation algorithm is presented, which is used to calculate the temperature distribution in the thermoforming sheet to obtain the most even final wall thickness distribution. For different thermoforming parts an improvement of the final wallt hickness distribution could be achieved.

Grantor dc:publisher

Publikationsserver der RWTH Aachen University

Year dc:date

2001

Author dc:creator

• Detrois, Christian

Contributors dc:contributor

• Haberstroh, Edmund

• info:eu-repo/classification/ddc/660
• Technische Chemie
• Thermoplast
• Thermoformen
• Halbzeug
• Verarbeitungseigenschaft
• Dehnung
• Rheologie
• Rheologische Eigenschaft

Statement dc:rights

• info:eu-repo/semantics/openAccess

Language dc:language

ger

Identifier

https://publications.rwth-aachen.de/search?p=id:%22RWTH-CONV-123611%22

OAI identifier oai:identifier

oai:publications.rwth-aachen.de:62012