Abstract
The paper presents the results of tests related to relaxation of stresses in models of samples made using the technology of photo-curing of liquid polymer resins polyjet modeling (PJM). The models of the samples were made using two types of materials: VeroWhite and FullCure 720. The tests were performed on samples in compliance with the PN-EN ISO 3384 standard. The technological parameter whose impact was analyzed was the orientation of the models on the virtual building platform, which was defined with three variability levels (0°, 45°, and 90°). The tests demonstrated that the position of the models on the building platform has a significant impact on the relaxation of compressive stresses. Moreover, the most advantageous positions of the models on the building platform from the standpoint of relaxation of stresses were determined.
Highlights
Rapid prototyping (RP) technologies have been known since over 30 years ago when some of the first technologies, such as Stereolithography (SLA) [14], Selective Laser Sintering (SLS) [15], and Fused Deposition Modelling (FDM) [16] were developed and patented
After the test cycle was completed, relaxation of stresses was determined according to relationship 1 given in the PNEN ISO 3384 standard [7]; Table 1 shows the results of the measurements according to the orientation of the models on the building platform (Fig. 1 and 2)
A quantitative analysis of the results of the tests leads to the conclusion that in the case of sample modules made using the polyjet modeling (PJM) technology and using the VeroWhite resin, relaxation of stresses is on a similar level
Summary
Rapid prototyping (RP) technologies have been known since over 30 years ago when some of the first technologies, such as Stereolithography (SLA) [14], Selective Laser Sintering (SLS) [15], and Fused Deposition Modelling (FDM) [16] were developed and patented. Due to the layer nature of construction, manufactured elements have a number of anisotropic properties that largely depend on the orientation of the models in relation to the building platform. One of the most important criteria is the form of the starting material, which can be a solid, e.g. a rod (FDM), a liquid (SLA, PJM), or a powder (SLS, SLM). Another very common criterion is the type. Those technologies use such materials as both plastics and selected groups of metals. During the tests, the Statistica software and the Origin software was used to conduct a basic statistical analysis of the results of the tests and to approximate the relaxation curves using selected mathematical models
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