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. 2023 Feb 15;15(4):960.
doi: 10.3390/polym15040960.

Modelling Influence on Bending Behaviour Simulation of the Poly(Lactic Acid) Structures, 3D Printed

Dorin-Ioan Catana  1 , Denisa-Iulia Brus  2 , Mihai-Alin Pop  3
Affiliations

Modelling Influence on Bending Behaviour Simulation of the Poly(Lactic Acid) Structures, 3D Printed

Dorin-Ioan Catana et al. Polymers (Basel). .

Abstract

The paper presents the influence of the loading modelling on the simulation process results of the bending behaviour for 3D printed structures. The study is done on structures having different geometries of the cross section, and the type of structure is bar or tube. The materials used for 3D printing are poly(lactic) acid and poly(lactic acid) mixed with glass fibres. The simulation was carried out both based on a simple modelling (schematization) of the bending loading and a complex one. The complex modelling reproduces the bending of 3D printed structures more accurately but is also more time-consuming for the computer-aided design stage. Analysis of the study results shows that in terms of the Von Mises stresses determined by simulation, they are in line with those of the tests but with a slight advantage for the complex modelling compared to the simple one. In terms of deformations, the simulation introduces errors compared to the test results, but the source of the errors is the high elasticity of some 3D printed structures. The study also shows that the high elasticity is due to both the shape of the structure cross section and its arrangement during the bending test.

Keywords: additive manufacturing; bending; poly(lactic acid); simulation.

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Conflict of interest statement

The authors declare no conflict of interest. The funders had no role in the design of the study; in the collection, analyses, or interpretation of data; in the writing of the manuscript, or in the decision to publish the results.

Figures

Figure 1
Figure 1
Simple modelling (SM) of bending stress.
Figure 2
Figure 2
Complex modelling (CM) of bending stress.
Figure 3
Figure 3
Dimensions and shapes of the specimens (ISO metric drawing standard).
Figure 4
Figure 4
Result of simulation process for G_R5 specimen (Von Mises stress). (a) Von Mises stress for simple modelling. (b) Von Mises stress for complex modelling.
Figure 5
Figure 5
Evolution of the bending strength values for 3D printed specimens.
Figure 6
Figure 6
Result of simulation process for G_R5 specimen (total deformation values). (a) Total deformation values for simple modelling. (b) Total deformation values for complex modelling.
Figure 7
Figure 7
Evolution of the bending total deformation values for 3D printed specimens.
Figure 8
Figure 8
Result of simulation process for P_R15 specimen (Von Mises stress). (a) Von Mises stress for simple modelling. (b) Von Mises stress for complex modelling.
Figure 9
Figure 9
Result of simulation process for P_R15 specimen (total deformation values). (a) Total deformation values for simple modelling. (b) Total deformation values for complex modelling.
See this image and copyright information in PMC

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