Finite element analysis for setting shrinkage stress of recycled-PET polymer concrete

2006 ◽  
Vol 10 (4) ◽  
pp. 283-290
Author(s):  
Ghi Ho Tae ◽  
Byung Wan Jo
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Polymer Concrete ◽  
Shrinkage Stress ◽  
Element Analysis ◽  
Recycled Pet

scholarly journals Influence of Cement Thickness on the Polymerization Shrinkage Stress of Adhesively Cemented Composite Inlays: Photoelastic and Finite Element Analysis

Oral ◽  
2021 ◽  
Vol 1 (2) ◽  
pp. 168-180
Author(s):  
Larissa Mendes Campaner ◽  
Alana Barbosa Alves Pinto ◽  
Amir Mohidin Demachkia ◽  
Tarcísio José de Arruda Paes-Junior ◽  
Clóvis Pagani ◽  
...  
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Film Thickness ◽  
Resin Cement ◽  
Shrinkage Stress ◽  
Element Analysis ◽  
Polymerization Shrinkage ◽  
Photoelastic Analysis ◽  
Group 2 ◽  
Group 1

The objective of this study was to analyze the effect of cement thickness on the strain and stresses resulting from the polymerization of resin cement using photoelasticity and Finite Element Analysis (FEA). For this study, twenty upper first premolars with inlay cavity preparation were constructed from photoelastic resin and restored with composite resin inlay. The samples were divided into two groups (n = 10) according to the film thickness of resin cement material. For Group 1, the film thickness was 100 μm; for Group 2, the film thickness was 400 μm. After polymerization of the cement, photoelastic analysis and finite element analysis (FEA) were performed. In the photoelastic analysis, Group 2 showed higher strain with the presence of second-order fringe even after 24 h. In Group 1, the formation of first order fringes was not observed, even after 24 h. In the FEA analysis, the greatest cusp deflection and tensile stress occurred in Group 2 (0.00026 mm and 0.305 MPa, respectively) due to the polymerization shrinkage in the lingual cusp compared to Group 1 (0.000107 mm and 0.210 MPa, respectively). It can be concluded that the thickness of the resin cement influences the cusp deflection, with the greater thickness of the cement layer, the greater stresses and deformations in the tooth structure occur.

scholarly journals Structural Dimensioning of an Equipment to Sinter Refuse of Recycled PET

2021 ◽  
Vol 31 (2) ◽  
pp. 61-73
Author(s):  
Gabriel Angelo Santos Mendes ◽  
Alexandre Scari
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Open Source Software ◽  
Hydraulic System ◽  
Recycling Process ◽  
Element Analysis ◽  
Recycled Pet ◽  
Structural Modifications ◽  
Design Requirements ◽  
Commercial Applications

The consumption of polyethylene terephthalate (PET) has been increasing every year, as well as its recycling process as the applications of recycled PET are diversified. However, the recycling companies are not able to recycle 100% of PET because the particles with low granulometry (refuse) are not utilized because they stick to the extruder screw and are discarded. This study presents the structural dimensioning of a proposal of an equipment to sinter this refuse in some predetermined geometries, in order to achieve possible commercial applications. This structural dimensioning was done with finite element analysis open-source software Salome Meca. Some structural modifications required to achieve the design requirements are presented. Yet, the hydraulic system to operate the compression was also dimensioned.

scholarly journals Impact of Quantity of Resin, C-factor, and Geometry on Resin Composite Polymerization Shrinkage Stress in Class V Restorations

2014 ◽  
Vol 39 (2) ◽  
pp. 144-151 ◽  
Author(s):  
ALS Borges ◽  
AB Borges ◽  
TA Xavier ◽  
MC Bottino ◽  
JA Platt
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Cylindrical Cavity ◽  
Resin Composite ◽  
Shrinkage Stress ◽  
Two Dimensional ◽  
Element Analysis ◽  
Class V ◽  
Dimensional Finite Element ◽  
Von Mises

SUMMARY Objective This study evaluated the effect of quantity of resin composite, C-factor, and geometry in Class V restorations on shrinkage stress after bulk fill insertion of resin using two-dimensional finite element analysis. Methods An image of a buccolingual longitudinal plane in the middle of an upper first premolar and supporting tissues was used for modeling 10 groups: cylindrical cavity, erosion, and abfraction lesions with the same C-factor (1.57), a second cylindrical cavity and abfraction lesion with the same quantity of resin (QR) as the erosion lesion, and then all repeated with a bevel on the occlusal cavosurface angle. The 10 groups were imported into Ansys 13.0 for two-dimensional finite element analysis. The mesh was built with 30,000 triangle and square elements of 0.1 mm in length for all the models. All materials were considered isotropic, homogeneous, elastic, and linear, and the resin composite shrinkage was simulated by thermal analogy. The maximum principal (MPS) and von Mises stresses (VMS) were analyzed for comparing the behavior of the groups. Results Different values of angles for the cavosurface margin in enamel and dentin were obtained for all groups and the higher the angle, the lower the stress concentration. When the groups with the same C-factor and QR were compared, the erosion shape cavity showed the highest MPS and VMS values, and abfraction shape, the lowest. A cavosurface bevel decreased the stress values on the occlusal margin. The geometry factor overcame the effects of C-factor and QR in some situations. Conclusion Within the limitations of the current methodology, it is possible to conclude that the combination of all variables studied influences the stress, but the geometry is the most important factor to be considered by the operator.

scholarly journals Finite element analysis of the stress distribution in a representative elementary volume of mineral casting

2018 ◽  
Vol 178 ◽  
pp. 04010
Author(s):  
Mihai Ciupan
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Stress Distribution ◽  
Machine Tools ◽  
Low Cost ◽  
Tensile Loading ◽  
Representative Elementary Volume ◽  
Polymer Concrete ◽  
Elementary Volume ◽  
Element Analysis

Mineral casting is a type of polymer concrete that has started to be used in commercial machine-tools in the last few years because of its low cost of manufacturing and vibration damping capabilities. The paper presents the modelling and finite element analysis of a representative elementary volume (REV) made of mineral casting subjected to tensile loading. The aim of the paper is to assess the stress distribution that develops inside the specimen in order to understand and improve the material.

Experimental Study and Finite Element Analysis of Reinforced Inorganic Polymer Concrete Beam

2012 ◽  
Vol 193-194 ◽  
pp. 891-896
Author(s):  
Zhe An Lu ◽  
Xin Jin ◽  
Xiao Chun Fan
Keyword(s):  
Finite Element Analysis ◽  
Experimental Study ◽  
Finite Element ◽  
Inorganic Polymer ◽  
Polymer Concrete ◽  
Engineering Practice ◽  
Element Analysis ◽  
The Finite Element Analysis ◽  
Load Function ◽  
Ductility Ratio

The stress behavior of the reinforced inorganic polymer concrete(IPC) beam was discussed, included the load-deflection curve, craze load and ultimate bearing capacity under the static load function through the method of the experimental study and the non-linear finite element analysis. Compared the data of the experiment with the results of the finite element analysis, it indicates that the reinforced IPC beam owns higher ductility ratio and better deformation capacity on the same loading condition. Meanwhile, the cracks of IPC beam develop more slowly than the normal ones, there were less and smaller cracks on IPC beam. The research results offer the theoretical and experimental references for engineering practice and design index of IPC.

Post-gel and Total Shrinkage Stress of Conventional and Bulk-fill Resin Composites in Endodontically-treated Molars

2020 ◽  
Vol 45 (5) ◽  
pp. E217-E226
Author(s):  
RA da Silva Pereira ◽  
GF de Bragança ◽  
ABF Vilela ◽  
RA de Deus ◽  
RR Miranda ◽  
...  
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Composite Resin ◽  
Composite Resins ◽  
Shrinkage Stress ◽  
Element Analysis ◽  
Posterior Teeth ◽  
Polymerization Shrinkage ◽  
Total Shrinkage ◽  
Selection Of

Clinical Relevance The clinician should consider the polymerization shrinkage stress when selecting a composite resin for posterior restorations. The use of post-gel shrinkage values should guide the selection of a composite resin for posterior teeth. SUMMARY Objectives: The objective of this study was to evaluate the effect of the method used for calculation of polymerization shrinkage, total or post-gel, on the shrinkage stress of conventional and bulk-fill composite resins for restoring endodontically treated teeth using finite element analysis. Methods and Materials: Four composite resins were tested for post-gel shrinkage (P-Shr) by the strain-gauge test and total shrinkage (TShr) using an optical method (n=10). Two conventional composite resins, Filtek Z350 XT (3M-ESPE; Z350) and TPH3 Spectrum (Dents-ply; TPH3) and two bulk-fill composite resins. Filtek Bulk-Fill Posterior (3M-ESPE; POST) SureFil SDR flow (Dentsply; SDR) were tested. Elastic modulus (E), diametral tensile strength (DTS), and compressive strength (CS) were also determined (n=10). The residual shrinkage stress was evaluated by finite element analysis with four restorative techniques: incremental with Z350 and TPH3; SDR/TPH3 (two bulk increments of 4 mm and two occlusal increments); and two bulk increments of 5 mm for POST. Data for P-Shr, T-Shr, E, DTS, and CS were analyzed by analysis of variance and Tukey’s test (α=0.05), and residual shrinkage was analyzed quantitatively and qualitatively by the modified von Mises criteria. Results: SDR had the lowest CS values, POST and TPH3 had similar and intermediate values, and Z350 had the highest CS. TPH3 and Z350 had similar DTS values and values higher than SDR. Z350 and POST had higher P-Shr, and SDR had lower T-Shr. T-Shr resulted in higher shrinkage stress than P-Shr values. SDR/TPH3 resulted in higher shrinkage stress when using T-Shr and lower values when using the P-Shr value. Conclusion: T-Shr resulted in higher stress in the enamel and in root dentin close to the pulp chamber than P-Shr values. The selection of the T-Shr or P-Shr changed the ranking of the shrinkage stress of the tested composite resin.

scholarly journals Computer Aided Design Modelling and Finite Element Analysis of Premolar Proximal Cavities Restored with Resin Composites

Materials ◽  
2021 ◽  
Vol 14 (9) ◽  
pp. 2366
Author(s):  
Amanda Guedes Nogueira Matuda ◽  
Marcos Paulo Motta Silveira ◽  
Guilherme Schmitt de Andrade ◽  
Amanda Maria de Oliveira Dal Piva ◽  
João Paulo Mendes Tribst ◽  
...  
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Resin Composite ◽  
Class Ii ◽  
Direct Access ◽  
Shrinkage Stress ◽  
Element Analysis ◽  
Flowable Composite ◽  
Vertical Slot ◽  
Slot Cavity

This study evaluated the stress distribution in five different class II cavities of premolar models restored with conventional or bulk-fill flowable composite by means of finite element analysis (FEA) under shrinkage and occlusal loading. An upper validated premolar model was imported in the software, and five class II cavities with different occlusal extensions and dimensions were prepared: horizontal cavity on the mesial surface (horizontal slot), mesio-occlusal cavity, mesial cavity (vertical slot), tunnel type cavity and direct access cavity. The models were restored with conventional or bulk-fill flowable resin composite. The tested materials were considered as homogeneous, linear, and isotropic. The Maximum Principal Stress criteria was chosen to evaluate the tensile stress results. The lowest shrinkage stress value was observed in the direct access cavity restored with bulk-fill flowable resin composite (36.12 MPa). The same cavity, restored with conventional composite showed a score of 36.14 MPa. The horizontal slot cavity with bulk-fill flowable showed a score of 46.71 MPa. The mesio-occlusal cavity with bulk-fill flowable had a score of 53.10 MPa, while with conventional composite this was 55.35 MPa. Higher shrinkage stress was found in the vertical slot cavity with conventional resin 56.14 MPa, followed by the same cavity with bulk-fill flowable 56.08 MPa. Results indicated that the use of bulk-fill flowable composite resin more significantly decreased the polymerization shrinkage stress magnitude. The larger the cavity and the volume of material necessary to restore the tooth, the greater the residual stress on enamel and dentin tissue.

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