The aim of this study was to estimate the measurement uncertainty for a material produced by additive manufacturing. The material investigated was FullCure 720 photocured resin, which was applied to fabricate tensile specimens with a Connex 350 3D printer based on PolyJet technology. The tensile strength of the specimens established through static tensile testing was used to determine the measurement uncertainty. There is a need for extensive research into the performance of model materials obtained via 3D printing as they have not been studied sufficiently like metal alloys or plastics, the most common structural materials. In this analysis, the measurement uncertainty was estimated using a larger number of samples than usual, i.e., thirty instead of typical ten. The results can be very useful to engineers who design models and finished products using this material. The investigations also show how wide the scatter of results is.
The aim of this study was to assess the innovation risk for an additive manufacturing process. The analysis was based on the results of static tensile tests obtained for specimens made of photocured resin. The assessment involved analyzing the measurement uncertainty by applying the FMEA method. The structure of the causes and effects of the discrepancies was illustrated using the Ishikawa diagram. The risk priority numbers were calculated. The uncertainty of the tensile test measurement was determined for three printing orientations. The results suggest that the material used to fabricate the tensile specimens shows clear anisotropy of the properties in relation to the printing direction.
This paper presents amethod for evaluatingthe innovation of enterprisesusing quantitative measures. It is applicable to detailedstudies in the process of forecasting and is an instrument for assessing individual companies. Itprovides knowledge that is useful for making“maps of innovation”and devising strategic plans for the development of states and regions. Enterprise innovation is assessed within two coupled functional groups ─ technologicaland intellectual─using a six-level scale.The results of evaluation are presented graphically with a structure called the“map of innovation.” This structure, as a measure of the intensity of various forms of innovative activities, is determined in each functional group.
Welding technology at current level provides wide range of applications such as automotive or aerospace industries. New technique, ways of approach and use of new materials (for example aluminum or composite parts of car body parts) creates necessity of optimizing of welding.The article is focused on welding of two parts using Metal Active Gas (MAG) welding. The main task is to design most suitable parameters for welding structural steel S235 J0. Samples were prepared by CNC machining center by chamfering edges 30°. Machined samples were placed against each other creating angle of total 60°. Welding machine Einhell BT-GW 170 MAG was used to create V and Y shaped welds with various technological parameters. Goal of the article is experimentally determine combination of technological parameters for V and Y shaped weld joints of steel components with thickness of 6 mm focused on hardness. Every welding machine and of course additive material has some recommended values of parameters in large scale, therefore it is necessary to determine most appropriate combination of main welding parameters. Data obtained from experiment showed most suitable combination of variables of welding process in order to achieve highest quality of weld joint.
Article is focused on using eddy current to measure of internal residual stress after milling. In presented article is described methodical process of identification residual stress in internal layers of the surface after machining of steel C45. Eddy current provides fast identification of residual stress directly in engineering areas without necessity to transfer samples in specialized laboratories. Presented article also describe procedure of evaluating measured values of deviation and its transformation to values of residual stress by conversion coefficients.
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