Abstract
This research paper reviews the test results involving viscoelastic properties of cellular structure models made with the PolyJet Matrix—PJM additive technology. The designed test specimens were of complex cellular structure and made of three various photo-curable polymer resin types. Materials were selected taking into account the so-called “soft” and “tough” material groups. Compressive stress relaxation tests were conducted in accordance with the recommendations of standard ISO 3384, and the impact of the geometric structure shape and material selection on viscoelastic properties, as well as the most favorable geometric variants of the tested cellular structure models were determined. Mathematica and Origin software was used to conduct a statistical analysis of the test results and determine five-parameter functions approximating relaxation curves. The most favorable rheological was adopted and its mean parameters determined, which enables to match both printed model materials and their geometry in the future, to make a component with a specific rheological response. Furthermore, the test results indicated that there was a possibility of modelling cellular structures within the PJM technology, using support material as well.
Highlights
The development of additive technologies entailed new process possibilities, such as the option to build new composites [18,19,20] and cellular structures applied in numerous fields of industry, in medicine
The authors of this paper presented the results of stress relaxation tests for different cellular structure models, made from three types of photo-curable resins using the PolyJet Matrix (PJM) technology
Specimen designated as D, with the dimensions and combination the same as specimen C, with internal structures in the form of intersecting cylindrical channels filled alternately with model materials, exhibited the least stress relaxation
Summary
The development of additive technologies entailed new process possibilities, such as the option to build new composites [18,19,20] and cellular structures applied in numerous fields of industry, in medicine. As a highly variable industrial sector with a great degree of prototype model application is one of the main consumers of 3D printing technologies. It is visible in the case of building all kinds of actuators, soft robotics, as well as housing elements and covers. Many examples of the use of 3D/4D printing technology in robotics have been discussed in numerous research work [22,23,24,25,26]
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