• Pinter, Gerald
• Petersmann, Sandra
• Spörk, Martin
• Steene, Willem Van De
• Wiener, Johannes
• Üçal, Muammer
• Arbeiter, Florian Josef

Abstract

Additive manufacturing has established itself in many areas, including medicine,<br/>where personalisation is of particular interest. However, fundamental relationships<br/>between the process and the resulting properties still need to be investigated before<br/>it can become the new state of the art manufacturing process of medical prostheses<br/>or implants. In the field of polymers, material extrusion-based additive manufacturing<br/>is particularly widespread. In this process, a thermoplastic filament is melted and<br/>deposited on a build platform forming a component layer by layer. Due to the layerby-<br/>layer construction, numerous weld lines and cavities are introduced into the<br/>material if the process parameters are not optimised. These areas represent defects<br/>and can severely compromise the resulting mechanical properties of the<br/>manufactured part. Since the mechanical integrity of implant materials is vital, the<br/>identification of these defects is required. The localisation and qualification of defects<br/>can be used to explain material failure [1] or even predict damage for a specific<br/>loading scenario. Moreover, the number of possible loading scenarios for implant<br/>materials is very high ranging from cyclic loading due to respiration to impact loading<br/>in accidents. Additionally, the behaviour of polymeric materials can significantly<br/>depend on temperature variations. Hence, temperature and strain-rate dependent<br/>material data should be used in the design process of a specific implant [1].<br/>REFERENCES<br/>[1] S. Petersmann, M. Spoerk, W. Van de Steene, M. Üçal. J. Wiener, G. Pinter, F.<br/>Arbeiter, Journal of the Mechanical Behavior of Biomedical Materials, 104,<br/>103611, 2020.

Topics

• impedance spectroscopy
• microstructure
• extrusion
• defect
• thermoplastic
• material extrusion