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Evaluation of relaxation properties of digital materials obtained by means of PolyJet Matrix technology

Bochnia J.

Bulletin of the Polish Academy of Sciences. Technical Sciences

2018

Vol. 66, nr 6

891--897

The paper presents the results of research on the stress relaxation of selected digital materials obtained by means of additive technology. A 5-parameter Maxwell-Wiechert model was used to describe the stress relaxation curves, allowing to obtain a very close fit. Anisotropy of properties was found due to the direction of sample printouts.

Digital materials – evaluation of the possibilities of using selected hyperelastic models to describe constitutive relations

Mańkowski J., Lipnicki J.

International Journal of Applied Mechanics and Engineering

2017

Vol. 22, no. 3

601--612

The authors tried to identify the parameters of numerical models of digital materials, which are a kind of composite resulting from the manufacture of the product in 3D printers. With the arrangement of several heads of the printer, the new material can result from mixing of materials with radically different properties, during the process of producing single layer of the product. The new material has properties dependent on the base materials properties and their proportions. Digital materials tensile characteristics are often non-linear and qualify to be described by hyperelastic materials models. The identification was conducted based on the results of tensile tests models, its various degrees coefficients of the polynomials to various degrees coefficients of the polynomials. The Drucker’s stability criterion was also examined. Fourteen different materials were analyzed.