Design of the Columns of one Passenger Station in HongKong

2011 ◽  
Vol 94-96 ◽  
pp. 520-526
Author(s):  
Hui Feng Xi ◽  
Wei Ping Yang ◽  
Zhi Gui Zhan
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Special Structure ◽  
Element Analysis ◽  
Design Standard ◽  
Conventional Design ◽  
Passenger Station

A passenger station in Hongkong with a special structure whose roof is supported by nine mega columns which are linked in the middle by joints. The conventional design standard are inapplicable and alternatively for this structure, the design of the supporting columns of the passenger stations was verified by both finite element analysis and manual calculations. The results are consistent with each other.

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.

Analysis of the Mechanical Properties of Cement Silo Structure

2013 ◽  
Vol 423-426 ◽  
pp. 1234-1237
Author(s):  
Hong Gan ◽  
Yi Zhen Yang
Keyword(s):  
Mechanical Properties ◽  
Finite Element Analysis ◽  
Finite Element ◽  
Simulation Modeling ◽  
Cement Industry ◽  
Special Structure ◽  
Element Analysis ◽  
Cement Production ◽  
Ansys Simulation ◽  
Analysis Calculation

Cement silo belonging to special structure, widely used in the cement industry, cement production is essential in the process of building. With the development of society, advances in industrial, cement silo construction have been expanding. This is an update to a cement silo structure, using finite element analysis, calculation and analysis in the context of full and half given mechanical properties, with ANSYS simulation modeling in order to get weak cement silo structure location, and design improvements for the weak position.

scholarly journals Effect of intercostal muscle contraction on rib motion in humans studied by finite element analysis

2018 ◽  
Vol 125 (4) ◽  
pp. 1165-1170 ◽  
Author(s):  
Guangzhi Zhang ◽  
Xian Chen ◽  
Junji Ohgi ◽  
Fei Jiang ◽  
Seiryo Sugiura ◽  
...  
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Muscle Contraction ◽  
Muscle Force ◽  
Special Structure ◽  
Tissue Deformation ◽  
Intercostal Muscle ◽  
Element Analysis ◽  
Rib Cage ◽  
Intercostal Muscles

The effect of intercostal muscle contraction on generating rib motion has been investigated for a long time and is still controversial in physiology. This may be because of the complicated structure of the rib cage, making direct prediction of the relationship between intercostal muscle force and rib movement impossible. Finite element analysis is a useful tool that is good at solving complex structural mechanic problems. In this study, we individually activated the intercostal muscle groups from the dorsal to ventral portions and obtained five different rib motions classified based on rib moving directions. We found that the ribs cannot only rigidly rotate around the spinal joint but also be deformed, particularly around the relatively soft costal cartilages, where the moment of muscle force for the rigid rotation is small. Although the intercostal muscles near the costal cartilages cannot generate a large moment to rotate the ribs, the muscles may still have a potential to deform the costal cartilages and contribute to the expansion and contraction of the rib cage based on the force-length relationship. Our results also indicated that this potential is matched well with the special shape of the costal cartilages, which become progressively oblique in the caudal direction. Compared with the traditional explanation of rib motion, by additionally considering the effect from the tissue deformation, we found that the special structure of the ventral portion of the human rib cage could be of mechanical benefit to the intercostal muscles, generating inspiratory and expiratory rib motions. NEW & NOTEWORTHY Compared with the traditional explanation of rib motion, additionally considering the effect from tissue deformation helps us understand the special structure of the ventral portion of the human rib cage, such that the costal cartilages progressively become oblique and the costochondral junction angles gradually change into nearly right angles from the upper to lower ribs, which could be of mechanical benefit to the intercostal muscles in the ventral portion, generating inspiratory and expiratory rib motions.

Finite Element Analysis on Telescopic Suspension Arm of Dirt-Removing Crane Based on ANSYS

2013 ◽  
Vol 423-426 ◽  
pp. 1924-1928
Author(s):  
Dong Dong Liang
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Fatigue Life ◽  
Mechanical Model ◽  
Ansys Software ◽  
Element Analysis ◽  
Conventional Design ◽  
Range Of Variation

A finite-element mechanical model is established aiming at the features of telescopic suspension arm of dirt-removing crane in practice, such as that there exist many compound modes, the range of variation in lifting weight is big, etc. The strength, stiffness and stability of suspension arm is calculated and optimized based on ANSYS (software). The result of conventional design, which is checked and revised, tallies with the measured value relatively and may provide valuable reference for the design of suspension arm, which is to some extent significant to prolonging the fatigue life of cranes.

scholarly journals Development of a Standard for New Passenger Car Wheel Designs

2006 ◽  
Author(s):  
Brandon Talamini ◽  
Benjamin Perlman ◽  
Jeff Gordon
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Residual Stresses ◽  
Public Transportation ◽  
Fatigue Cracking ◽  
Material Behavior ◽  
Fatigue Properties ◽  
Element Analysis ◽  
Design Standard ◽  
In Transit

The American Public Transportation Association (APTA) is seeking to develop specifications to ensure that wheels used in transit and commuter applications perform safely under the service conditions to which they are exposed. To this end, a design standard has been conceived to ensure that new wheel designs proposed for such applications are not susceptible to fatigue cracking in the wheel plate and hub. Historically, the Association of American Railroads (AAR) Standard S-660 has been applied in the industry for the purposes of qualifying wheel designs for use in passenger applications. The standard stipulates particular loads to apply in a simple finite element analysis of the new wheel design. The basis for approval is an empirical comparison (by an independent third party) of the results with those in a database of previous analysis results of other qualified wheels. The proposed "S-660 equivalent" design standard is envisioned to be self-qualifying, in that results of the analysis will directly determine whether the wheel design will perform safely in service; a review or approval body will not be required. The new standard is needed to overcome limitations embodied in the current wheel qualification process, namely, the assumption of purely elastic material behavior, the omission of residual stresses due to manufacturing, and the use of comparative approval criteria. The Union Internationale des Chemins de Fer (UIC) introduced a wheel design requirement based on finite element analysis, the results of which are subjected to a fatigue criterion in order to achieve acceptance of the wheel design. As in the current S-660 methodology, a set of thermal and mechanical loads are prescribed. This methodology is essentially self-qualifying as the results of the analysis (obtained following a prescribed procedure) determine whether the wheel design will perform safely in service. The proposed design standard is envisioned to be a combination of the current S-660 analysis requirements and the fatigue calculation-based approach of the UIC. The task force developing the standard is still resolving the specific details of the thermal and mechanical loading requirements. This paper explores the underlying methodology behind the developing standard. A finite element calculation forms the basis of the qualification procedure. Initial (asmanufactured) residual stresses present in a new wheel are determined. Mechanical and thermal loading representative of passenger operations are applied. The analysis yields three characteristic stress distributions: as-manufactured, mechanical, and thermal. The Sines criterion, with temperature-dependent material fatigue properties obtained from testing, is applied to infer whether the candidate wheel design is fatigue-prone. Results are presented for a wheel design currently in transit/commuter service. The APTA committee is currently investigating the thermal and mechanical load levels to be prescribed in the proposed standard.

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