Abstract
The article describes the experimental and simulation research on the material properties of the individualized wrist orthoses produced in the additive manufacturing (AM) process by the fused filament fabrication (FFF) method. The authors produced a series of standard (normalized) samples for three-point bending from acrylonitrile butadiene styrene (ABS) filament on a low-budget 3D printer and a series of samples in the shape of a fragment of the orthosis and the entire orthosis. All types of samples were subjected to experimental tests on a universal testing machine, which allowed us to determine the modulus of elasticity of the produced materials by comparing it with finite element method (FEM) simulation models in the ABAQUS environment. The adopted research methodology allowed us to compare the material properties of the material of the entire product—wrist hand orthosis (WHO)—with the material properties of standard bending samples. The obtained values of Young’s modulus are characterized by a large discrepancy between the standard samples and the entire orthosis. On the other hand, the samples with the shape of the middle part of the orthosis were similar in the value of Young’s modulus to the results obtained during the examination of the complete orthosis.
Highlights
IntroductionIt is more and more common to use products created in the process of additive manufacturing in layers (additive manufacturing, AM)
Nowadays, it is more and more common to use products created in the process of additive manufacturing in layers
The comparison of the vertical displacement values obtained in the simulation tests using the individual layers of the thermoplastic
Summary
It is more and more common to use products created in the process of additive manufacturing in layers (additive manufacturing, AM). The most commonly used materials are acrylonitrile butadiene styrene (ABS) and polylactic acid (PLA) thermoplastics, but the range of materials and their applications is constantly growing [5]. Products manufactured by this technique are characterized by high anisotropy of strength properties, and the processing conditions significantly affect the values of the technical coefficients of used materials. Altering merely a single process parameter—product orientation in the working space—associated with the application of material layers by FDM/FFF devices, can make the material properties between individual products differ significantly [6]. In [7], the authors indicated that for Materials 2020, 13, 4379; doi:10.3390/ma13194379 www.mdpi.com/journal/materials
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