Analysis on Fracture Accident of the Roll and Universal Joint

2013 ◽  
Vol 401-403 ◽  
pp. 65-68
Author(s):  
Xi Wang ◽  
Chang Liang Xu
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Stress Distribution ◽  
Maximum Stress ◽  
Universal Joint ◽  
Element Analysis ◽  
Power Load ◽  
Actual Load ◽  
Universal Spindle ◽  
The Impact

The fracture accident of roll and universal join are analyzed, and universal spindle forked joint with finite element analysis is analysed, the stress distribution and maximum stress value is obtained. In the impact power load caused by the roll biting stopping is calculated in detail, and the largest actual load and maximum stress in possible is calculated, explaining the cause of fracture of the important parts such as universal spindle forked joint, and putting forward the improvement opinion for the equipment design and using.

scholarly journals Stress Distribution in Implant-Supported Overdenture and Peri-Implant Bone Using Three Attachment Systems: A Finite Element Analysis

2021 ◽  
Vol 13 (2) ◽  
pp. 57-61
Author(s):  
Alireza Izadi ◽  
Fariboorz Vafaie ◽  
Armaghan Shahbazi ◽  
Mohamad Taghi Mokri vala
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Stress Distribution ◽  
Maximum Stress ◽  
Titanium Implants ◽  
Load Application ◽  
Von Mises Stress ◽  
Bone Block ◽  
Element Analysis ◽  
Minimum Stress

Background: This finite element analysis (FEA) evaluated stress distribution in implant-supported overdenture (ISO) and peri-implant bone using one extracoronal (ball) and two intracoronal (locator and Zest Anchor Advanced Generation (ZAAG)) attachment systems. Methods: In this in vitro study, the mandible was modelled in the form of an arc-shaped bone block with 33 mm height and 8 mm width. Two titanium implants were modelled at the site of canine teeth, and three attachments (ZAGG, locator, and ball) were placed over them. Next, 100 N load was applied at 90° and 30° angles from the molar site of each quadrant to the implants. The stress distribution pattern in the implants and the surrounding bone was analyzed, and the von Mises stress around the implants and in the crestal bone was calculated. Results: While minimum stress in peri-implant bone following load application at 30° angle was noted in the mesial point of the locator attachment, maximum stress was recorded at the distal point of the ball attachment following load application at 90° angle. Maximum stress around the implant following load application at 90° angle was noted in the lingual point of the ball attachment while minimum stress was recorded in the lingual point of the locator attachment following load application at 90° angle. Conclusions: According to the results, the locator attachment is preferred to the ZAAG attachment, and the ball attachment should be avoided if possible.

scholarly journals Evaluation of Stress Distribution and Force in External Hexagonal Implant: A 3-D Finite Element Analysis

2021 ◽  
Vol 18 (19) ◽  
pp. 10266
Author(s):  
Vinod Bandela ◽  
Ram Basany ◽  
Anil Kumar Nagarajappa ◽  
Sakeenabi Basha ◽  
Saraswathi Kanaparthi ◽  
...  
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Stress Distribution ◽  
Maximum Stress ◽  
Axial Direction ◽  
Von Mises Stress ◽  
P Value ◽  
Implant Surface ◽  
Element Analysis ◽  
Von Mises

Purpose: To analyze the stress distribution and the direction of force in external hexagonal implant with crown in three different angulations. Materials and Methods: A total of 60 samples of geometric models were used to analyze von Mises stress and direction of force with 0-, 5-, and 10-degree lingual tilt. Von Mises stress and force distribution were evaluated at nodes of hard bone, and finite element analysis was performed using ANSYS 12.1 software. For calculating stress distribution and force, we categorized and labeled the groups as Implant A1, Implant A2, and Implant A3, and Implant B1, Implant B2, and Implant B3 with 0-, 5-, and 10-degree lingual inclinations, respectively. Inter- and intra-group comparisons were performed using ANOVA test. A p-value of ≤0.05 was considered statistically significant. Results: In all the three models, overall maximum stress was found in implant model A3 on the implant surface (86.61), and minimum was found on model A1 in hard bone (26.21). In all the three models, the direction of force along three planes was maximum in DX (0.01025) and minimum along DZ (0.002) direction with model B1. Conclusion: Maximum von Mises stress and the direction of force in axial direction was found at the maximum with the implant of 10 degrees angulation. Thus, it was evident that tilting of an implant influences the stress concentration and force in external hex implants.

Effect of Design Parameters on Thermomechanical Stress in Silicon of Through-Silicon Via

2016 ◽  
Vol 138 (3) ◽  
Author(s):  
Joo-Sun Hwang ◽  
Seung-Ho Seo ◽  
Won-Jun Lee
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Stress Distribution ◽  
Maximum Stress ◽  
Design Parameters ◽  
Element Analysis ◽  
Through Silicon Via ◽  
Dielectric Thickness ◽  
Thermomechanical Stress ◽  
Lower Region

We examined the effect of the design parameters of a through-silicon via (TSV) on the thermomechanical stress distribution at the bottom of the TSV using finite element analysis. Static analyses were carried out at 350 °C to simulate the maximum thermomechanical stress during postplating annealing. The thermomechanical stress is concentrated in the lower region of a TSV, and the maximum stress in silicon occurs at the bottom of the TSV. The TSV diameter and dielectric liner thickness were two important determinants of the maximum stress in the silicon. The maximum stress decreased with decreasing TSV diameter, whereas the effect of aspect ratio was negligible. A thick dielectric liner is advantageous for lowering the maximum stress in silicon. The minimum dielectric thickness resulting in a maximum stress less than the yield stress of silicon was 520, 230, and 110 nm for via diameters of 20, 10, and 5 μm, respectively. The maximum stress also decreased with the thickness of the copper overburden.

scholarly journals Comparative Analysis of Stress and Deformation between One-Fenced and Three-Fenced Dental Implants Using Finite Element Analysis

2021 ◽  
Vol 10 (17) ◽  
pp. 3986
Author(s):  
Chia-Hsuan Lee ◽  
Arvind Mukundan ◽  
Szu-Chien Chang ◽  
Yin-Lai Wang ◽  
Shu-Hao Lu ◽  
...  
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Comparative Analysis ◽  
Stress Distribution ◽  
Dental Implant ◽  
Maximum Stress ◽  
Vertical Force ◽  
Element Analysis ◽  
Different Types ◽  
Stress And Deformation

Finite element analysis (FEA) has always been an important tool in studying the influences of stress and deformation due to various loads on implants to the surrounding jaws. This study assessed the influence of two different types of dental implant model on stress dissipation in adjoining jaws and on the implant itself by utilizing FEA. This analysis aimed to examine the effects of increasing the number of fences along the implant and to compare the resulting stress distribution and deformation with surrounding bones. When a vertical force of 100 N was applied, the largest displacements found in the three-fenced and single-fenced models were 1.7469 and 2.5267, respectively, showing a drop of 30.8623%. The maximum stress found in the three-fenced and one-fenced models was 13.518 and 22.365 MPa, respectively, showing a drop of 39.557%. Moreover, when an oblique force at 35° was applied, a significant increase in deformation and stress was observed. However, the three-fenced model still had less stress and deformation compared with the single-fenced model. The FEA results suggested that as the number of fences increases, the stress dissipation increases, whereas deformation decreases considerably.

scholarly journals Effect of age-related alterations on the biomechanics of teeth affected by non-carious cervical lesions

2019 ◽  
Vol 22 (2) ◽  
pp. 171-177
Author(s):  
Marina Gullo Augusto ◽  
Tabata Do Prado Sato ◽  
Maria José Domingues De Castro ◽  
Marcia Carneiro Valera ◽  
Alexandre Luis Souto Borges ◽  
...  
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Stress Concentration ◽  
Stress Distribution ◽  
Cervical Lesions ◽  
Element Analysis ◽  
Compact Structure ◽  
Age Related ◽  
Occlusal Surfaces ◽  
The Impact

Objective: The prevalence of non-carious cervical lesions (NCCLs) has increased in the recent years, especially in the elderly population. The successful prevention and treatment of those lesions requires an understanding of the biomechanics of aged teeth. Considering the importance of such aspect, the impact of the age-related dentin deposition on the stress distribution of NCCLs was evaluated by means of finite element analysis. Material and Methods: A 2-dimensional model of a sound maxillary first premolar was created using CAD software. Two tooth geometries (sound, aged) and two lesion shapes (wedge, saucer) were simulated to the model. The mesh was built with 35,000 triangle and square elements of 0.1 mm in length. All tissues were considered isotropic, homogeneous and linear. Occlusal surfaces were loaded with 300 N for simulating normal chewing forces. The stress distribution was analyzed by a color scale and by the maximum principal stress at the cavosurface line angle. Results: The aged models presented lower stress concentration in the overall system in comparison to sound models. The sharp angle of wedge shaped lesions promoted higher stress concentration at the center of cavosurface angle, favoring the lesions progression. Conclusion: Considering the limitations of the current methodology, it is possible to conclude that aged tooth is a more compact structure that can better respond to stress loadings. This protective intrinsic mechanism should be considered when adopting preventive and restorative measures for NCCLs for the elderly.KeywordsAging; Finite element analysis; Non-carious; Cervical lesions.

Investigation of the Effect of Abutment Angle Tolerance on the Stress Created in the Fixture and Screw in Dental Implants Using Finite Element Analysis

2021 ◽  
Vol 51 ◽  
pp. 63-76
Author(s):  
Bijan Mohammadi ◽  
Zahra Abdoli ◽  
Ehsan Anbarzadeh
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Stress Distribution ◽  
Dental Implants ◽  
Maximum Stress ◽  
Element Analysis ◽  
Bone Implant ◽  
Implant Placement ◽  
And Control ◽  
Biomechanical Factors

Today, an artificial tooth root called a dental implant is used to replace lost tooth function. Treatment with dental implants is considered an effective and safe method. However, in some cases, the use of dental implants had some failures. The success of dental implants is influenced by several biomechanical factors such as loading type, used material properties, shape and geometry of implants, quality and quantity of bone around implants, surgical method, lack of rapid and proper implant surface's integration with the jaw bone, etc. The main purpose of functional design is to investigate and control the stress distribution on dental implants to optimize their performance. Finite element analysis allows researchers to predict the stress distribution in the bone implant without the risk and cost of implant placement. In this study, the stresses created in the 3A.P.H.5 dental implant's titanium fixture and screw due to the change in abutment angles tolerance have been investigated. The results show that although the fixture and the screw's load and conditions are the same in different cases, the change of the abutment angle and the change in the stress amount also made a difference in the location of maximum stress. The 21-degree abutment puts the fixture in a more critical condition and increases the chance of early plasticization compared to other states. The results also showed that increasing the abutment angle to 24 degrees reduces the stress in the screw, but decreasing the angle to 21 degrees leads to increased screw stress and brings it closer to the fracture.

Influence of Cross Beam on the Stress of Joints in A-Type Pier of a Bridge

2012 ◽  
Vol 446-449 ◽  
pp. 1329-1332
Author(s):  
Chun Ping Tang ◽  
Liang Liang Zhang
Keyword(s):  
Numerical Simulation ◽  
Finite Element Analysis ◽  
Finite Element ◽  
Stress Distribution ◽  
Maximum Stress ◽  
Analysis Software ◽  
Element Analysis ◽  
Beam Depth ◽  
Layer Analysis ◽  
High Pier

Non-linear numerical simulation is done on A-type super high pier by using finite element analysis software ANSYS, obtaining the node stress distribution under load in the node area taken in the sequential layer analysis of overall mode. The conclusion is mainly as follows: the change of width and thickness of cross beam exerts slight impact on the maximum stress of the node while the change of cross beam depth impacts the node stress much. From the computation, it can be concluded that proper reduction of cross beam depth is beneficial to the node stress.

scholarly journals Finite Element Analysis of Stress Distribution in Normal and Osteoporosis Pelvis Models

2019 ◽  
Vol 56 (4) ◽  
pp. 840-844 ◽  
Author(s):  
Bogdan Veliceasa ◽  
Ovidiu Alexa ◽  
Paul Dan Sirbu ◽  
Alexandru Filip ◽  
Edward Rakosi ◽  
...  
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Stress Distribution ◽  
Maximum Stress ◽  
Pelvic Ring ◽  
Osteoporotic Bone ◽  
Posterior Arch ◽  
Element Analysis ◽  
Obturator Foramen ◽  
Common Understanding

Finite element analysis is the most commonly used methods in orthopedic biomechanical research. The study aims at improving the common understanding of the behavior of the pelvis and the biomechanics of the pelvic ring in a healthy and osteoporosis configuration. We performed a finite element analysis using the ANSYS program. The study mainly focused on bones and the joints and the complex modelling of the ligaments was ignored. The results of our study showed that the stress distribution of the pelvis with osteoporosis was changed compared with normal pelvis. In addition to, in the healthy bone, where the maximum stress values are concentrated around the obturator foramen (anterior arch of the pelvic ring), in the osteoporotic bone, the maximum stress also appear at the posterior arch of the pelvic ring (especially in the sacrum.

Impact of different restorative techniques on the stress distribution of endodontically-treated maxillary first premolars: a 2-dimensional finite element analysis

2020 ◽  
Vol 1 (1) ◽  
pp. 11761
Author(s):  
Felipe De Souza Matos ◽  
Thaís Christina Cunha ◽  
Ayla Macyelle De Oliveira Correia ◽  
João Paulo Mendes Tribst ◽  
Taciana Marco Ferraz Caneppele ◽  
...  
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Stress Distribution ◽  
Maximum Principal Stress ◽  
Glass Ionomer ◽  
Element Analysis ◽  
Biomechanical Behavior ◽  
Dimensional Finite Element ◽  
Homogeneous Stress ◽  
The Impact

The aim of this study was to investigate, through finite element analysis, the impact of different restorative techniques on stress distribution in endodontically-treated maxillary first premolars. A human maxillary first premolar was modeled following the real anatomical dimensions, through a periapical radiography, using the Rhinoceros software, version 4.0SR8. The model was then replicated to compose the groups according to the coronary restorative technique: C (coltosol), GI.C (glass ionomer + coltosol), GI (glass ionomer), CR.GI (conventional resin + glass ionomer), and BR.GI (Bulk Fill resin + glass ionomer). After the models were finished, they were imported as IGES files into ANSYS software, version 17.2. Fixation was defined at the base of the cortical bone and the load was applied with 300 N axially to the buccal and palatal cusps. The results generated were in maximum principal stress (MPS), with the CR.GI and BR.GI groups presenting the lowest values of tension concentration and more homogeneous stress distribution, followed by GI, GI.C and C. All restorative techniques affected the stress distribution in endodontically-treated maxillary first premolars, promoting greater tension in the occlusal third, at the interface with the buccal wall, and in the cervical third. Conventional or Bulk Fill resins associated with a glass ionomer base have a superior biomechanical behavior in relation to coltosol or glass ionomer.

scholarly journals To Evaluate the Influence of Implant Length on Stress Distribution of Osseointegrated Implant: A Three-Dimensional Finite Element Analysis: An In Vitro Study

2018 ◽  
Vol 6 (02/03) ◽  
pp. 097-105
Author(s):  
Neha Jindal ◽  
Manjit Kumar ◽  
Shailesh Jain ◽  
Navjot Kaur ◽  
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Stress Distribution ◽  
Biomechanical Analysis ◽  
Von Mises Stress ◽  
Element Analysis ◽  
Von Mises ◽  
The Impact ◽  
Implant Length ◽  
Nonsignificant Decrease

AbstractFinite element analysis is a technique for obtaining a solution to a complex mechanical problem by dividing the problem domain into a collection of much smaller and simpler domains (elements) in which the field variables can be interpolated with the use of shape functions. An overall approximated solution to the original problem is determined based on variational principles. Finite element analysis can provide a nondestructive system for quantifying stresses generated at the various interfaces of similar or dissimilar material. The finite element method also allows the study of the internal state of stress of components as well as stress patterns in two or more dissimilar materials adjacent to each other without affecting their independent behavior. This method is therefore ideally suitable for the biomechanical analysis of orthopedic, cardiovascular, and dental structures. In this study, implants of different length were numerically analyzed using bone-implant models developed from computed tomography-generated images of the mandible with osseointegrated implants. The impact of various lengths on stress distribution was examined using implants with a length of 8, 10, and 13 mm in mandibular first molar region under axial load of 100 N and buccolingual load of 50 N. All materials were assumed to be linearly elastic and isotropic. The Statistical Package for the Social Sciences software package was used for statistical analysis. Maximum von Mises stresses were located around the implant neck. It was demonstrated that there was statistically nonsignificant decrease in von Mises stress as the implant length increased. Within the limitations of this study, there was statistically nonsignificant decrease in von Mises stress as the implant length increased.

Sign in / Sign up

Export Citation Format

Share Document