Influence of toe load on the fatigue resistance of elastic rail clips

2017 ◽  
Vol 232 (4) ◽  
pp. 1078-1087 ◽  
Author(s):  
Anat Hasap ◽  
Phanasindh Paitekul ◽  
Nitikorn Noraphaiphipaksa ◽  
Chaosuan Kanchanomai
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Fatigue Resistance ◽  
Cyclic Deformation ◽  
Static Load ◽  
Critical Component ◽  
Wheel Load ◽  
Element Analysis ◽  
Fatigue Experiment

As a critical component of the fastening system, the elastic rail clip maintains the rail in the vertical, lateral, and longitudinal positions using its specified toe load. In this study, the influence of toe load on the deformation and fatigue resistance of the clip was studied. Finite element analysis, static load experiments, and fatigue experiments were performed to evaluate the deformation and fatigue resistance of the clip. With the contribution of the lateral wheel load, the deformation range of the outer clip was higher than that of the inner clip. Therefore, the cyclic deformation of the outer clip was used for the fatigue experiment. The toe load had no influence on the fatigue resistance of the clip under normal wheel load, i.e. the clips under high, normal, and low toe loads were run-out at 5 × 106 cycles. However, with the contribution of impact on the wheel load, the fatigue lives were reduced to 5468 cycles and 16,839 cycles for the clips under high and normal toe loads, respectively. In the case of low toe load, the clip under the contribution of impact could withstand more than 5 × 106 cycles. Accordingly, the reduction of toe load may enhance the fatigue resistance of the clip under impact.

scholarly journals Fatigue resistance and 3D finite element analysis of machine-milled ceramic occlusal veneers with new preparation designs versus conventional design: an in vitro study

F1000Research ◽  
2019 ◽  
Vol 8 ◽  
pp. 1038 ◽  
Author(s):  
Samaa Kotb ◽  
Atef Shaker ◽  
Carl Halim
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Fatigue Resistance ◽  
Element Analysis ◽  
3D Finite Element ◽  
Group Iii ◽  
Conventional Design ◽  
Group I ◽  
Group Ii ◽  
Preparation Design

Background: Treatment of patients with severe tooth wear is complex. Treatments involving more tooth structure removal may be inappropriate for patients who have already lost a significant amount of dental tissue due to erosion. The aim of this study was to evaluate the effect of two modified occlusal veneer preparations on the fatigue resistance and stress distribution of bonded occlusal veneers, in comparison to the conventional preparation design. Methods: A total of 54 human mandibular molars were distributed into three equal groups of n=18 teeth each, according to the occlusal veneer preparation design, where group I (conventional design) received Planar occlusal veneer preparation, group II (occlusal veneer with circumferential finish line) and group III (occlusal veneer with intracoronal cavity extension). For the manufacture of all the veneers using machinable zirconium lithium silicate glass ceramic blocks, a computer aided design/manufacturing system was used. A dual cure, adhesive resin cement was used to bond all occlusal veneers to corresponding prepared teeth. After storage in water for one week, step-stress (accelerated life testing was performed for all samples. Finite element analysis was carried out as well to evaluate the distribution of stresses. Results: The highest values (mean±SD) were recorded for group II (890.57±211.53 N) followed by Group I values (883.54±135.91 N), while the lowest values were recorded for Group III (875.57±143.52 N). The difference between groups was statistically non-significant as indicated by ANOVA (P=0.9814>0.05). The stress values were generally found to be low and their distribution differed among groups. Conclusion: Group I and II showed comparable fatigue resistance and more favourable failure behaviour when compared to Group III based on the fractographic and 3D finite element analyses.

Strength Analysis of the Seat Structure for Large Passenger Vehicles by Using Finite Element Method

2013 ◽  
Vol 658 ◽  
pp. 335-339
Author(s):  
Somsak Siwadamrongpong ◽  
Supakit Rooppakhun ◽  
Pakorn Burakorn ◽  
Natchaya Murachai
Keyword(s):  
Finite Element Method ◽  
Finite Element Analysis ◽  
Finite Element ◽  
Static Load ◽  
Strength Analysis ◽  
Safety Regulation ◽  
Element Analysis ◽  
Passenger Vehicles ◽  
Suitable Structure ◽  
Structure Strength

Presently, large passenger vehicles are known to have high risk of an injury due to accident and insufficient of safety regulation. The strength of seat is one of important issues that affect to injury level of passenger. Therefore, suitable structure strength and design of the seat are very important to prevent injuries and passenger life. This study was to evaluate strength of the seat structure for bus according to preliminary safety regulation of Department of Land Transport. Finite element analysis is employed by using a static load. The seat model was simplified and simulated. Stress and impact scenario between seat-back and back of manikin will be investigated. The strength and deflection of the seat will be evaluated. This study is expected to provide the seat model which will be safe and satisfied according to the regulation.

Development of an in-house MATLAB code for finite element analysis of composite beam under static load

2019 ◽  
Author(s):  
Pratik R. Patil ◽  
Aniket S. Ahire ◽  
M. L. J. Suman ◽  
S. M. Murigendrappa
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Composite Beam ◽  
Static Load ◽  
Element Analysis ◽  
Matlab Code

Fibre reinforced polymer reinforcing bars for bridge decks

2000 ◽  
Vol 27 (5) ◽  
pp. 839-849 ◽  
Author(s):  
T Hassan ◽  
A Abdelrahman ◽  
G Tadros ◽  
S Rizkalla
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Nonlinear Finite Element Analysis ◽  
Nonlinear Finite Element ◽  
Wheel Load ◽  
Element Analysis ◽  
Concentrated Load ◽  
Reinforced Polymer ◽  
Fibre Reinforced Polymer ◽  
Frp Reinforcement

This paper describes the behaviour of two full-scale models of a portion of highway bridge slab reinforced with fibre reinforced polymer (FRP) reinforcement. The first slab was reinforced totally with carbon FRP (CFRP), and the second slab was reinforced with hybrid glass FRP (GFRP) and steel reinforcement. The models were tested under static loading up to failure using a concentrated load acting on each span of the continuous slab and the two cantilevers to simulate the effect of a truck wheel load. Load-deflection behaviour, crack patterns, strain distribution, and failure mode are reported. The measured values are compared to values calculated using nonlinear finite element analysis model. The accuracy of the nonlinear finite element analysis is demonstrated using independent test results conducted by others. The analytical model is used to examine the influence of various parameters, including the type of reinforcement, boundary conditions, and reinforcement ratio. Based on serviceability and ultimate capacity requirements, reinforcement ratios for using CFRP and GFRP reinforcement for typical bridge deck slabs are recommended.Key words: bridges, deflection, FRP, reinforcement, concrete, punching, slabs, shear, finite element model, strain.

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