Stress distribution in a premolar 3D model with anisotropic and isotropic enamel

2015 ◽  
Vol 53 (8) ◽  
pp. 751-758 ◽  
Author(s):  
Laís S. Munari ◽  
Tulimar P. M. Cornacchia ◽  
Allyson N. Moreira ◽  
Jason B. Gonçalves ◽  
Estevam B. De Las Casas ◽  
...  
Keyword(s):  
Stress Distribution ◽  
3D Model

Effects of conform, non-conform, and hybrid conformity toward stress distribution at the glenoid implant and cement: A finite element study

2021 ◽  
pp. 039139882199939
Author(s):  
Abdul Hadi Abdul Wahab ◽  
Nor Aqilah Mohamad Azmi ◽  
Mohammed Rafiq Abdul Kadir ◽  
Amir Putra Md Saad
Keyword(s):  
Stress Distribution ◽  
Daily Living ◽  
3D Model ◽  
Promising Result ◽  
High Stress ◽  
Constant Load ◽  
Posterior Region ◽  
Implant Stability ◽  
Eccentric Load ◽  
Standing Up

Glenoid conformity is one of the important aspects that could contribute to implant stability. However, the optimal conformity is still being debated among the researchers. Therefore, this study aims to analyze the stress distribution of the implant and cement in three types of conformity (conform, non-conform, and hybrid) in three load conditions (central, anterior, and posterior). Glenoid implant and cement were reconstructed using Solidwork software and a 3D model of scapula bone was done using MIMICS software. Constant load, 750 N, was applied at the central, anterior, and posterior region of the glenoid implant which represents average load for daily living activities for elder people, including, walking with a stick and standing up from a chair. The results showed that, during center load, an implant with dual conformity (hybrid) showed the best (Max Stress—3.93 MPa) and well-distributed stress as compared to other conformity (Non-conform—7.21 MPa, Conform—9.38 MPa). While, during eccentric load (anterior and posterior), high stress was located at the anterior and posterior region with respect to the load applied. Cement stress for non-conform and hybrid implant recorded less than 5 MPa, which indicates it had a very low risk to have cement microcracks, whilst, conform implant was exposed to microcrack of the cement. In conclusion, hybrid conformity showed a promising result that could compromise between conform and non-conform implant. However, further enhancement is required for hybrid implants when dealing with eccentric load (anterior and posterior).

Finite Element Analysis of Accurate Tooth Profile Diesel Engine Gear

2011 ◽  
Vol 121-126 ◽  
pp. 1610-1613
Author(s):  
Da Shu Wang ◽  
Hong Mei Li
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Diesel Engine ◽  
Stress Distribution ◽  
3D Model ◽  
Accurate Method ◽  
Contact Strength ◽  
Element Analysis ◽  
Nonlinear Contact ◽  
Gear Contact

This paper puts forward the method of establishing the accurate 3D model of involute gear and imports the model to MSC.Patran to mesh the grid. The stress distribution is simulated by applying the MSC.Marc to solve the nonlinear contact problem. It is a quick and accurate method to analyze the gear contact strength.

Optimal Design and Contact Analysis for Planetary Roller Screw

2011 ◽  
Vol 86 ◽  
pp. 361-364 ◽  
Author(s):  
Shang Jun Ma ◽  
Geng Liu ◽  
Jian Xing Zhou ◽  
Rui Ting Tong
Keyword(s):  
Finite Element ◽  
Optimal Design ◽  
Stress Distribution ◽  
3D Model ◽  
Structural Parameters ◽  
Contact Analysis ◽  
Contact Deformation ◽  
Roller Screw

Based on the meshing principle of Planetary Roller Screw (PRS), the meshing clearance of screw pair is minimized by taking the half of thread angle, and the pitch diameter tooth thickness, e, as the optimization variables. Optimal structural parameters are obtained by using optimization module of the software Matlab. The 3D model of PRS structures are established with Solidworks and the finite element contact analysis is carried out with Ansys. The contact deformation and stress distribution are calculated among screw, rollers and nut. The results can be used for PRS design.

Static Analysis of Crane Gearbox QJC-D900

2007 ◽  
Author(s):  
Xiaoling Zhang ◽  
Qiang Miao ◽  
Hong-Zhong Huang ◽  
Dan Ling ◽  
Zhonglai Wang
Keyword(s):  
Finite Element ◽  
Stress Distribution ◽  
Finite Element Simulation ◽  
Static Analysis ◽  
3D Model ◽  
Model Design ◽  
Heavy Duty ◽  
Element Simulation ◽  
Gear Box ◽  
Strength And Stiffness

In this paper the 3D model of the three stage helical gearbox was establish using UNIGEAPHICS (UG) firstly, and then the structure static analysis was realized by ANSYS. Accordingly the gear-box’ stress distribution, deformation can be obtained, so the strength and stiffness of the gear-box can be calculated based on the stress and the deformation results, which helps us to evaluate whether the design demand can be satisfied or not. The structure static analysis provides suggestions for the improvement of model design, and the finite element simulation to the large, heavy-duty gear-box reducer can provide technical assurance for the dependability of the production.

Effect of Geometrical Assumptions on Numerical Modeling of Coronary Blood Flow Under Normal and Disease Conditions

2010 ◽  
Vol 132 (6) ◽  
Author(s):  
Saravan Kumar Shanmugavelayudam ◽  
David A. Rubenstein ◽  
Wei Yin
Keyword(s):  
Blood Flow ◽  
Numerical Modeling ◽  
Shear Stress ◽  
Stress Distribution ◽  
Coronary Blood Flow ◽  
3D Model ◽  
Peak Shear Stress ◽  
Stenosis Severity ◽  
2D And 3D ◽  
2D Model

Shear stress plays a pivotal role in pathogenesis of coronary heart disease. The spatial and temporal variation in hemodynamics of blood flow, especially shear stress, is dominated by the vessel geometry. The goal of the present study was to investigate the effect of 2D and 3D geometries on the numerical modeling of coronary blood flow and shear stress distribution. We developed physiologically realistic 2D and 3D models (with similar geometries) of the human left coronary artery under normal and stenosis conditions (30%, 60%, and 80%) using PROE (WF 3). Transient blood flows in these models were solved using laminar and turbulent (k-ω) models using a computational fluid dynamics solver, FLUENT (v6.3.26). As the stenosis severity increased, both models predicted a similar pattern of increased shear stress at the stenosis throat, and in recirculation zones formed downstream of the stenosis. The 2D model estimated a peak shear stress value of 0.91, 2.58, 5.21, and 10.09 Pa at the throat location under normal, 30%, 60%, and 80% stenosis severity. The peak shear stress values at the same location estimated by the 3D model were 1.41, 2.56, 3.15, and 13.31 Pa, respectively. The 2D model underestimated the shear stress distribution inside the recirculation zone compared with that of 3D model. The shear stress estimation between the models diverged as the stenosis severity increased. Hence, the 2D model could be sufficient for analyzing coronary blood flow under normal conditions, but under disease conditions (especially 80% stenosis) the 3D model was more suitable.

scholarly journals RESEARCH ON TRANSVERSE ACETABULAR FRACTURE FIXATION USING DIFFERENT PLATE ATTACHMENT METHODS / GŪŽDUOBĖS SKERSINIO LŪŽIO FIKSAVIMO SKIRTINGAI IŠDĖSTYTOMIS PLOKŠTELĖMIS TYRIMAS

2015 ◽  
Vol 6 (6) ◽  
pp. 626-629
Author(s):  
Gediminas Gaidulis ◽  
Julius Griškevičius ◽  
Valentinas Uvarovas ◽  
Igoris Šatkauskas
Keyword(s):  
Finite Elements ◽  
Stress Distribution ◽  
Yield Strength ◽  
Hip Joint ◽  
Fracture Fixation ◽  
Acetabular Fracture ◽  
3D Model ◽  
Joint Structure ◽  
Fracture Displacement ◽  
Maximal Stress

The article deals with the problem of transverse acetabular fracture fixation using different plate attachment methods. A 3D model of pelvis and hip joint structure was created and the design of three different fixation plates using SolidWorks was made. The plates were fixed at distances of 10, 20 and 30 mm from the acetabulum. The model was meshed into finite elements, a static external load of 2500 N was added and the analysis of stress distribution in plates and fracture displacement was performed. The obtained results showed that fracture displacement was quite similar in all fixation methods. However, the maximal stress in the nearest from the acetabulum plate was higher than yield strength. Thus, this placement is not eligible. The plate fixed at a distance of 30 mm from the acetabulum appeared the most suitable because of the smallest and symmetrical stress distribution in the plate. Straipsnyje išnagrinėta gūžduobės skersinio lūžio fiksavimo skirtingai išdėstytomis plokštelėmis problema. Taikant kompiuterinį trimatį dubenkaulio modelį ir SolidWorks programų paketą, suprojektuotos 3 lūžiui fiksuoti reikalingos plokštelės, prie dubenkaulio tvirtinamos skirtingose vietose. Modelis suskirstytas į baigtinius elementus, pridėta statinė išorinė apkrova ir atlikta plokštelių įtempių bei lūžio vietos poslinkių analizė. Atsižvelgiant į gautus rezultatus, nustatytas tinkamiausias plokštelės tvirtinimo būdas.

The Lightening Design of the Off-Road Vehicle Frame

2012 ◽  
Vol 433-440 ◽  
pp. 3206-3210
Author(s):  
Cui Ping Wang
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Stress Distribution ◽  
3D Model ◽  
General Function ◽  
Element Analysis ◽  
Road Vehicle ◽  
Displacement Distribution ◽  
The Finite Element Analysis

The demand of the economy of the modern car becomes higher and higher, and the lightening design of the vehicle is an important factor in improving the economy. We do the finite element analysis for the built 3d model of the off-road vehicle frame to obtain the stress distribution and the displacement distribution, which can be used as the basis for The Lightening Design of the off-road vehicle frame. On the premise of keeping the general function unchanged, we can achieve the goal of lightening the vehicle, and improving the economy.

scholarly journals Use of engineering tools in modelling first bite–case study with grilled pork meat

2021 ◽  
Vol 854 (1) ◽  
pp. 012022
Author(s):  
Rastko Djekic ◽  
Jovan Ilic ◽  
Igor Tomasevic ◽  
Ilija Djekic
Keyword(s):  
Mechanical Properties ◽  
Finite Element Method ◽  
Finite Element ◽  
Stress Distribution ◽  
3D Model ◽  
Pork Meat ◽  
The Finite Element Method ◽  
Lower Jaw ◽  
Two Temperatures

Abstract This study provides an engineering approach in modelling the first bite. Based on the mechanical properties of grilled pork meat obtained by applying compression and Warner Bratzler tests and using the Finite element method, a 3D model of cubic pieces has been created. It was then used for simulating the first bite of pork meat grilled at two temperatures and three positions of the jaws. Stress distribution during impact of upper and lower jaw shows growth of internal stress in the direction of jaw movement, leading to crack development and breaking of meat.

The concerted use of SEM, TEM, and SCM for examination of resin-dentin interfaces

1994 ◽  
Vol 52 ◽  
pp. 476-477
Author(s):  
B. Van Meerbeek ◽  
L. J. Conn ◽  
E. S. Duke
Keyword(s):  
Surface Layer ◽  
Stress Distribution ◽  
Phosphoric Acid ◽  
Bonding Mechanism ◽  
Restorative Dentistry ◽  
Dental Adhesive ◽  
Low Viscosity ◽  
Dentin Adhesives ◽  
Acid Etch ◽  
Tooth Tissue

Restoration of decayed teeth with tooth-colored materials that can be bonded to tooth tissue has been a highly desirable property in restorative dentistry for many years. Advantages of such an adhesive restorative technique over conventional techniques using non-adhesive metal-based restoratives include improved restoration retention with minimal sacrifice of sound tooth tissue for retention purposes, superior adaptation and sealing of the restoration margins in prevention of caries recurrence, improved stress distribution across the tooth-restoration interface throughout the whole tooth, and even reinforcement of weakened tooth structures. The dental adhesive technology is rapidly changing. An efficient resin bond to enamel has already long been achieved. Its bonding mechanism has been fully elucidated and has proven to be a durable and reliable clinical treatment. However, bonding to dentin represents a greater challenge. After the failures of a dentin acid-etch technique in imitation of the enamel phosphoric-acid-etch technique and a bonding procedure based on chemical adhesion, modern dentin adhesives are currently believed to bond to dentin by a micromechanical hybridization process. This process is developed by an initial demineralization of the dentin surface layer with acid etchants exposing a collagen fibril arrangement with interfibrillar microporosities that subsequently become impregnated by low-viscosity monomers. Although the development of such a hybridization process has well been documented in the literature, questions remain with respect to parameters of-primary importance to adhesive efficacy.

Generation of a 3D model to better mimic NAFLD in vitro

2016 ◽  
Vol 54 (12) ◽  
pp. 1343-1404
Author(s):  
LS Spitzhorn ◽  
MA Kawala ◽  
J Adjaye
Keyword(s):  
3D Model
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