Experimental determination and numerical simulation of temperature dependent material and damage behaviour of additively manufactured polyamide 12

Temperature dependent material and damage behaviour of additively manufactured polyamide 12 was analysed. Two different types of tests were carried out. Very slow isothermal and non-isothermal tensile tests at various temperature levels. The results served as basis for the determination of the param...

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Bibliographic Details
Published in:	Mechanics of materials Vol. 159; p. 103893
Main Authors:	Roszak, R., Schob, D., Sagradov, I., Kotecki, K., Sparr, H., Maasch, Ph, Franke, R., Ziegenhorn, M.
Format:	Journal Article
Language:	English
Published:	Elsevier Ltd 01-08-2021
Subjects:	Chaboche model GTN model Polyamide 12 SLS Temperature dependence Viscoplasticity Chaboche model Polyamide 12 GTN model Temperature dependence SLS Viscoplasticity
Online Access:	Get full text
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Summary:	Temperature dependent material and damage behaviour of additively manufactured polyamide 12 was analysed. Two different types of tests were carried out. Very slow isothermal and non-isothermal tensile tests at various temperature levels. The results served as basis for the determination of the parameters of the numerical simulation. In a previous study, it was observed that the viscoplastic material model of Chaboche and the damage model of Gurson-Tvergaard-Needleman are very well suited to the material and damage behaviour at room temperature. This work presents that the material model of Chaboche and the damage model of Gurson-Tvergaard-Needleman can be used for isothermal tensile tests at various temperature levels to simulate material and damage behaviour of selectively laser-sintered polyamide 12, with the requirement that the parameters are adjusted for each temperature level. Furthermore, the temperature dependence of the GTN parameters and a sensitivity analysis is presented. Finally, by extending the Chaboche model with the Johnson-Cook approach and coupling it with the Gurson-Tvergaard-Needleman damage model, the material and damage behaviour can be applied under non-isothermal test conditions. •3D printed polyamide 12 shows temperature dependent material and damage behaviour.•3D printed polyamide 12 shows pores and inhomogeneous material structure.•Isothermal material and damage behaviour can be represented by coupling the Chaboche and GTN model.•Non-isothermal material and damage behaviour can be mapped by the additional use of the Johnson Cook approach.•The temperature dependence and the influence of the GTN parameters are presented.
ISSN:	0167-6636 1872-7743
DOI:	10.1016/j.mechmat.2021.103893