The Effects of Materials Properties & Angle Junction on Stress Concentration at Interface of Dissimilar Materials

2011 ◽  
Vol 383-390 ◽  
pp. 887-892
Author(s):  
Alireza Fallahi Arezoodar ◽  
Ali Baladi
Keyword(s):  
Stress Concentration ◽  
Stress Distribution ◽  
Stress Reduction ◽  
Stiffness Matrix ◽  
Stress Singularity ◽  
Dissimilar Materials ◽  
Element Analysis ◽  
Materials Properties ◽  
Main Factors ◽  
Elastic Modules

In dissimilar material joints, failure often occurs along the interface between two materials due to stress singularity. Stress distribution and its concentration depend on materials and geometry of the junction as the stress concentration depends on grain orientation and its stiffness matrix of neighboring grains in micro-scale. Inhomogenity of stress distribution at the interface of junction of two materials with different elastic modules and stress concentration in this zone are the main factors resulting in rupture of the junction. Effect of materials properties, thickness, and joining angle at the interface of aluminum-polycarbonate will be discussed in this paper. Computer simulation and finite element analysis by ABAQUS showed that convex interfacial joint leads to stress reduction at junction corners in compare with straight joint. This finding is confirmed by photoelastic experimental results.

scholarly journals A Non-Singular Analytical Technique for Reinforced Non-Circular Holes in Orthotropic Laminate

2020 ◽  
Vol 25 (1) ◽  
pp. 92-105
Author(s):  
Pradeep Mohan ◽  
R. Ramesh Kumar
Keyword(s):  
Stress Distribution ◽  
Analytical Solution ◽  
Power Series ◽  
Orthotropic Shell ◽  
Infinite Plate ◽  
Stress Singularity ◽  
Power Series Solution ◽  
Element Analysis ◽  
Full Field ◽  
Analytical Technique

AbstractThe intricacy in Lekhnitskii’s available single power series solution for stress distribution around hole edge for both circular and noncircular holes represented by a hole shape parameter ε is decoupled by introducing a new technique. Unknown coefficients in the power series in ε are solved by an iterative technique. Full field stress distribution is obtained by following an available method on Fourier solution. The present analytical solution for reinforced square hole in an orthotropic infinite plate is derived by completely eliminating stress singularity that depends on the concept of stress ratio. The region of validity of the present analytical solution on reinforcement area is arrived at based on a comparison with the finite element analysis. The present study will also be useful for deriving analytical solution for orthotropic shell with reinforced noncircular holes.

scholarly journals Force Transfer and Stress Distribution in an Implant-Supported Overdenture Retained with a Hader Bar Attachment: A Finite Element Analysis

2013 ◽  
Vol 2013 ◽  
pp. 1-12 ◽  
Author(s):  
Preeti Satheesh Kumar ◽  
Kumar K. S. Satheesh ◽  
Jins John ◽  
Geetha Patil ◽  
Ruchi Patel
Keyword(s):  
Finite Element ◽  
Stress Concentration ◽  
Stress Distribution ◽  
Maximum Stress ◽  
Alveolar Bone ◽  
Von Mises Stress ◽  
Element Analysis ◽  
Finite Element Software ◽  
Force Transfer ◽  
Edentulous Mandible

Background and Objectives. A key factor for the long-term function of a dental implant is the manner in which stresses are transferred to the surrounding bone. The effect of adding a stiffener to the tissue side of the Hader bar helps to reduce the transmission of the stresses to the alveolar bone. But the ideal thickness of the stiffener to be attached to the bar is a subject of much debate. This study aims to analyze the force transfer and stress distribution of an implant-supported overdenture with a Hader bar attachment. The stiffener of the bar attachments was varied and the stress distribution to the bone around the implant was studied. Methods. A CT scan of edentulous mandible was used and three models with 1, 2, and 3 mm thick stiffeners were created and subjected to loads of emulating the masticatory forces. These different models were analyzed by the Finite Element Software (Ansys, Version 8.0) using von Mises stress analysis. Results. The results showed that the maximum stress concentration was seen in the neck of the implant for models A and B. In model C the maximum stress concentration was in the bar attachment making it the model with the best stress distribution, as far as implant failures are concerned. Conclusion. The implant with Hader bar attachment with a 3 mm stiffener is the best in terms of stress distribution, where the stress is concentrated at the bar and stiffener regions.

Structural Design of the Geometrical Shape of Interfaces in Bonded Dissimilar Materials Based on Theoretical Elastic Analysis

1999 ◽  
Vol 586 ◽  
Author(s):  
Masayoshi Tateno ◽  
Yasushi Fukuzawa ◽  
Shigeru Nagasawa ◽  
Hiroshi Sakuta
Keyword(s):  
Stress Distribution ◽  
Structural Design ◽  
Bonding Strength ◽  
Stress Singularity ◽  
Dissimilar Materials ◽  
Correlation Factor ◽  
Geometrical Shape ◽  
Elastoplastic Behavior ◽  
Secant Stiffness ◽  
The Relationship

ABSTRACTIn order to evaluate the practical strength of a joint and its fracture mode, it is important to find the stress distribution near the edge of the interface by analyses of strength and fracture. The index of stress singularity based on theoretical analysis is a useful tool to indicate the stress distribution.In this paper, investigations on the evaluation of the practical strength of bonded dissimilar materials based on the stress singularity are carried out. The secant stiffness module, which was used for plastics analysis, was applied to the evaluation of thermal elastoplastic behavior near the interface. Spherical conditions of the interface shape were used for the evaluation of stress behavior and the experiment of bonding strength. The relationship between the index of stress singularity, λ, and the practical strength of the bonded TiB2-Ni system was investigated by comparing theoretical λ, which was determined by substituting the secant stiffness module into Bogy's eigenequation, with the practical strength in the edge angle of the interface between 60° and 90° The correlation factor of the relationship between λ and the practical bonding strength of the TiB2-Ni system was found positive. These results show that the structural design of a geometrical interface which is getting a higher strength joint based on the index of stress singularity is verified experimentally.

Shear Stress Discontinuities in Adhesive Joints

2015 ◽  
Vol 1088 ◽  
pp. 758-762
Author(s):  
Xiao Cong He
Keyword(s):  
Shear Stress ◽  
Stress Concentration ◽  
Stress Distribution ◽  
Three Dimensional ◽  
Adhesive Layer ◽  
Adhesive Joints ◽  
Shear Stress Distribution ◽  
Element Analysis ◽  
Dimensional Finite Element ◽  
Three Dimensional Finite Element

This paper deals with the stress discontinuities in shear stress distribution of adhesive joints. The three-dimensional finite element analysis (FEA) software was used to model the joints and predict the shear stress distribution along the whole beam. The FEA results indicated that there are stress discontinuities existing in the shear stress distribution within adhesive layer and adherends at the lower interface and the upper interface of the boded section. The numerical values of the shear stress concentration at key locations of the joints and the stress concentration ratio are discussed.

Finite-Element Analysis of a Measuring Model for FeAlCrBSiNb Coating Bonding Strength of Revolution Body

2014 ◽  
Vol 577 ◽  
pp. 722-725
Author(s):  
Jia Ying Zhang ◽  
Gang Zhao ◽  
Ye Wang Sun ◽  
Jun Wei Yang ◽  
Huai Bin Yang
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Stress Concentration ◽  
Stress Distribution ◽  
Bonding Strength ◽  
Bonding Interface ◽  
Shearing Stress ◽  
Measuring Process ◽  
Element Analysis

The stress distribution of the coating interface in measuring bonding strength of revolution body coating was emulated. The stress curves of coating bonding interface were obtained. The abscission characteristics of coating were analyzed. It showed that Stress concentration occurred in the symmetric centre of the coating bonding interface. The coating peeled off from the symmetric centre to both sides of the sample interface in the measuring process. Avoiding shearing stress was a method to promote the measuring test of bonding strength of revolution body coating.

Mechanical Properties on the Welded Connection of Pipe and Hollow Spheres Joints

2011 ◽  
Vol 189-193 ◽  
pp. 3452-3457
Author(s):  
Ya Jie Yan ◽  
Hong Gang Lei ◽  
Xue Yang
Keyword(s):  
Finite Element ◽  
Stress Concentration ◽  
Stress Distribution ◽  
Wall Thickness ◽  
Stress Concentration Factor ◽  
Concentration Factor ◽  
Hollow Spheres ◽  
Steel Structures ◽  
Element Analysis ◽  
Static Tests

Taking pipe - hollow spherical node as the object, and using ANSYS finite element analysis software, established five kinds of finite element model to analyze the stress concentration at the weld connection of the different connections of steel structures - hollow ball under the uniaxial tension. Obtained this node’s stress concentration factor, stress distribution, by changing the hollow spherical diameter and wall thickness, pipe’s diameter and wall thickness, obtained the trend of the stress concentration factor under different control ball matches. Take static tests on typical structures of two specifications 6 hollow sphere nodes, get the measured stress concentration factor, and stress distribution of this node. Through comparative analysis of theoretical analysis and experimental results, show that the two rules are consistent. The research results can provide basis for improving the pipe - hollow spherical joints connecting structural.

Effect of the Number of Dental Implant Neck Threads in Contact With the Cortical Bone on Interface Stresses Using Finite Element Method

2013 ◽  
Author(s):  
Mohammed Moustafa Hassan ◽  
Moahamed-Tarek El-Wakad ◽  
E. M. Bakr
Keyword(s):  
Finite Element ◽  
Stress Distribution ◽  
Cortical Bone ◽  
Dental Implant ◽  
Stress Reduction ◽  
Tooth Loss ◽  
Shape Parameters ◽  
Great Role ◽  
Element Analysis ◽  
Bone Interface

Dental implants are a valuable, safe and predictable solution for patients suffering from tooth loss. The implant shape plays a great role in the success of dental implant, due to its effect on stress distribution in the surrounding bones. Therefore, optimizing some of implant shape parameters may improve stress distribution and consequently may lead to an increase in implant success rate. In this study, the 3D finite element analysis is used to investigate the influence of the number of threads in the neck of the implant on the implant-cortical bone interface stresses. The stress distribution along the implant-bone interface and their displacements were determined using ABAQUS/CAE 6.10 software. Overall, the stress was highest in the cortical bone at the neck of implant and lowest in the cancellous bone regardless of the number of threads in contact with cortical bone. On the other hand, reducing the number of threads in the neck resulted in a decrease in the developed stresses in both types of bones. The developed stresses around the bones decreased gradually in cortical bones and dramatically in cancellous bones when the number of threads decreased in the neck of implant. The stress reduction between the smooth neck to the fully threaded neck decreased the developed stresses by 24% in the cortical bone. However, due to improve the implant osseointegration, it is recommended to keep one or two threads in the cortical bone.

scholarly journals Effect of Offset Implant Placement on the Stress Distribution Around a Dental Implant: A Three-Dimensional Finite Element Analysis

2015 ◽  
Vol 41 (6) ◽  
pp. 646-651 ◽  
Author(s):  
Hakimeh Siadat ◽  
Shervin Hashemzadeh ◽  
Allahyar Geramy ◽  
Seyed Hossein Bassir ◽  
Marzieh Alikhasi
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Stress Concentration ◽  
Stress Distribution ◽  
Dental Implant ◽  
Three Dimensional ◽  
Element Analysis ◽  
3D Finite Element ◽  
Implant Placement ◽  
Mandibular Molar

There are some anatomical restrictions in which implants are not possible to be inserted in their conventional configuration. Offset placement of implants in relation to the prosthetic unit could be a treatment solution. The aim of this study was to evaluate the effect of the offset placement of implant-supported prosthesis on the stress distribution around a dental implant using 3D finite element analysis. 3D finite element models of implant placement in the position of a mandibular molar with 4 configurations (0, 0.5, 1, 1.5 mm offset) were created in order to investigate resultant stress/strain distribution. A vertical load of 100 N was applied on the center of the crown of the models. The least stress in peri-implant tissue was found in in-line configuration (0 mm offset). Stress concentration in the peri-implant tissue increased by increasing the amount of offset placement. Maximum stress concentration in all models was detected at the neck of the implant. It can be concluded that the offset placement of a single dental implant does not offer biomechanical advantages regarding reducing stress concentration over the in-line implant configuration. It is suggested that the amount of offset should be as minimum as possible.

scholarly journals Comparison of Platform Switched and Sloping Shoulder Implants on Stress Reduction in various Bone Densities: Finite Element Analysis

2017 ◽  
Vol 18 (6) ◽  
pp. 510-515 ◽  
Author(s):  
S Suresh ◽  
Joji Markose ◽  
Shruthi Eshwar ◽  
K Rekha ◽  
Vipin Jain
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Stress Distribution ◽  
Stress Reduction ◽  
Bone Growth ◽  
Compact Bone ◽  
Distribution Model ◽  
Implant Design ◽  
Element Analysis ◽  
Vertical Loading

ABSTRACT Introduction Comparison of platform switched (PS), sloping shoulder, and regular implants on stress reduction in various bone densities with finite element analysis. Materials and methods A total of 12 three-dimensional finite element models were built to analyze the stress distribution model. Nobel Biocare 4.3 × 8 mm regular platform replace select implant with matching diameter easy abutment, Nobel Biocare 4.3 × 8 mm replace select implant PS with 3.5 mm diameter easy abutment, Bicon 4 × 8 mm implant with 4 mm diameter sloping shoulder abutments were created virtually in compact bone density using software. The 130 N axial force and a 90 N oblique loading force were applied to the abutment to analyze the stress. Results Under horizontal and vertical loading, the sloping shoulder implant had lesser stresses in cancellous bone when compared with PS and regular implants. Sloping shoulder implant showed more stress distribution at implant–abutment interface and at crestal area, whereas with regular implants, the stresses were distributed at cortical area. Conclusion Sloping shoulder implant in subcrestal position is much favorable for bone growth, stress distribution, and preservation of remaining bone. Clinical significance Use of sloping shoulder implant design distributes the stress apically and creates lesser stresses when compared with PS implants. How to cite this article Markose J, Suresh S, Eshwar S, Rekha K, Jain V, Manvi S. Comparison of Platform Switched and Sloping Shoulder Implants on Stress Reduction in various Bone Densities: Finite Element Analysis. J Contemp Dent Pract 2017;18(6):510-515.

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.

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