Geometry of Ball Seat Valves

The macroscopic geometry of ball seat valves is important for the quality of the seal. This works discusses the influence of different geometric properties on the contact area, the contact pressure and their relation to the leakage. The leakage is calculated using the results of finite element method (FEM) calculations and Persson’s percolation based method. The following properties of the seat are examined: the angle, the curvature and the eccentricity.

Contact simulation analysis of double cylindrical asperities using the finite element method

Transactions of the Canadian Society for Mechanical Engineering ◽

10.1139/tcsme-2018-0186 ◽

2020 ◽

Vol 44 (1) ◽

pp. 72-83

Author(s):

Lihua Wang ◽

Liheng Chen ◽

Yayu Huang ◽

Tingqiang Yao ◽

Chunfeng Wang

Keyword(s):

Finite Element Method ◽

Finite Element ◽

Contact Pressure ◽

Contact Area ◽

Contact Load ◽

Single Peak ◽

Asperity Contact ◽

Contact Displacement ◽

To analyze the microcontact characteristics of the rough joint surface obtained by grinding more accurately, a frictionless contact model of double cylindrical asperities was established. The contact characteristics of double cylindrical asperities with different peak distance and different heights were analyzed using the finite element method. The relationship between contact load, contact pressure, contact area, and contact displacement were studied. And the effect of double asperities on the stress state of the cylindrical asperity contact zone was revealed. The results show that, in the elastic contact stage, the contact load, contact stress, contact pressure, and contact area decreased with an increase in the peak distance, and the corresponding values are smaller than that of single peak asperity contact. In the elastoplastic stage, because of the interaction of the double asperities, the change of the contact pressure with the contact displacement on the double asperities contact is larger than the corresponding value of the single peak asperity under the same conditions. The research can be applied into the model of anisotropic interface and provide theoretical foundations for the study on contact characteristics of grinding interface.

Towards Predicting Relative Belt Edge Endurance With the Finite Element Method

Tire Science and Technology ◽

10.2346/1.2141701 ◽

1990 ◽

Vol 18 (4) ◽

pp. 216-235 ◽

Cited By ~ 19

Author(s):

J. De Eskinazi ◽

K. Ishihara ◽

H. Volk ◽

T. C. Warholic

Keyword(s):

Finite Element Method ◽

Finite Element ◽

Three Dimensional ◽

Shear Deformations ◽

Element Analysis ◽

Vertical Loading ◽

Predicted Values ◽

Abstract The paper describes the intention of the authors to determine whether it is possible to predict relative belt edge endurance for radial passenger car tires using the finite element method. Three groups of tires with different belt edge configurations were tested on a fleet test in an attempt to validate predictions from the finite element results. A two-dimensional, axisymmetric finite element analysis was first used to determine if the results from such an analysis, with emphasis on the shear deformations between the belts, could be used to predict a relative ranking for belt edge endurance. It is shown that such an analysis can lead to erroneous conclusions. A three-dimensional analysis in which tires are modeled under free rotation and static vertical loading was performed next. This approach resulted in an improvement in the quality of the correlations. The differences in the predicted values of various stress analysis parameters for the three belt edge configurations are studied and their implication on predicting belt edge endurance is discussed.

Smoothed particle hydrodynamics versus finite element method for blast impact

Bulletin of the Polish Academy of Sciences Technical Sciences ◽

10.2478/bpasts-2013-0009 ◽

2013 ◽

Vol 61 (1) ◽

pp. 111-121 ◽

Cited By ~ 5

Author(s):

T. Jankowiak ◽

T. Łodygowski

Keyword(s):

Finite Element Method ◽

Finite Element ◽

Smoothed Particle Hydrodynamics ◽

Concrete Slab ◽

Particle Hydrodynamics ◽

Mesh Density ◽

Smoothed Particle ◽

Abstract The paper considers the failure study of concrete structures loaded by the pressure wave due to detonation of an explosive material. In the paper two numerical methods are used and their efficiency and accuracy are compared. There are the Smoothed Particle Hydrodynamics (SPH) and the Finite Element Method (FEM). The numerical examples take into account the dynamic behaviour of concrete slab or a structure composed of two concrete slabs subjected to the blast impact coming from one side. The influence of reinforcement in the slab (1, 2 or 3 layers) is also presented and compared with a pure concrete one. The influence of mesh density for FEM and the influence of important parameters in SPH like a smoothing length or a particle distance on the quality of the results are discussed in the paper

Analysis of submerged implant towards mastication load using 3D finite element method (FEM)

Padjadjaran Journal of Dentistry ◽

10.24198/pjd.vol28no3.13676 ◽

2016 ◽

Vol 28 (3) ◽

Author(s):

Widia Hafsyah Sumarlina Ritonga ◽

Janti Rusjanti ◽

Nunung Rusminah ◽

Aldilla Miranda ◽

Tatacipta Dirgantara

Keyword(s):

Finite Element Method ◽

Finite Element ◽

Contact Area ◽

Maximum Stress ◽

Implant Design ◽

3D Finite Element ◽

Alveolar Crest ◽

Component Design ◽

3D Finite Element Method ◽

Introduction: The surgical procedure of dental implant comprising one stage surgery for the non-submerged implant design and two stages for submerged. Submerged design is frequently used in Faculty of Dentistry Padjadjaran University as it is safer in achieving osseointegration. This study has been carried out to evaluate resistant capacity of an implant component design submerged against failure based on location and the value of internal stress during the application of mastication force using the 3D Finite Element Method (FEM). Methods: The present study used a CBCT radiograph of the mandibular patient and Micro CT Scan of one submerged implant. Radiograph image was then converted into a digital model of 3D computerized finite element, subsequently inputted the material properties and boundary condition with 87N occlusion load applied and about 29N for the shear force. Results: The maximum stress was found located at the contact area between the implant and alveolar crest with stress value registered up to 193.31MPa located within an implant body where is understandable that this value is far below allowable strength of titanium alloy of 860 MPa. Conclusion: The location of the maximum stress was located on the contact area between the implant-abutment and alveolar crest. This implant design is acceptable and no failure observed under mastication load.

Application of the Finite Element Method (FEM) through GFAS Software to the study of a tunnel

Green World Journal ◽

10.53313/gwj42006 ◽

2021 ◽

Vol 4 (2) ◽

pp. 001

Author(s):

Maurizio Ponte ◽

◽

Filippo Catanzariti ◽

Gloria Campilongo

Keyword(s):

Finite Element Method ◽

Finite Element ◽

Computational Simulation ◽

Theoretical Method ◽

Tunnel Excavation ◽

Analysis System ◽

Quality Of Products ◽

Computational simulation is widely used in companies to perform analysis and improve the quality of products and projects. Most of these analyses are carried out using software that uses the Finite Element Method, which allows to obtain answers to numerous engineering problems. In this study, two examples of application to the study of tunnels of the Finite Element Method using the Geostru Software "GFAS - Geotechnical F.E.M. Analysis System" are proposed. The case of a tunnel excavated inside a granite rock massif was analyzed, first determining the state of stresses in the cavity contour through a theoretical method and comparing these results with those obtained in the software. Then, by means of finite element modeling, the settlements induced by the excavation were determined. Finally, the problem of tunnel excavation in a viscoplastic rock mass is presented and the authors propose a comparison of the analytical and numerical method.

Effect of Traffic Flow on Characteristics of Piezoelectric Harvesting Unit

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.672-674.902 ◽

2014 ◽

Vol 672-674 ◽

pp. 902-905 ◽

Cited By ~ 1

Author(s):

Chun Hua Sun ◽

Guang Qing Shang

Keyword(s):

Finite Element Method ◽

Finite Element ◽

Electric Power ◽

Traffic Flow ◽

Contact Pressure ◽

Green Energy ◽

Oil Resources ◽

To protect dwindling coal and oil resources and open up a new way of renewable green energy, the technology of piezoelectric harvesting from pavement is proposed. Effect of traffic flow, including contact pressure and speed of a vehicle, on characteristics of a piezoelectric harvesting unit is discussed with the finite element method. Results show that the harvested electric power is approximately linear with the contact pressure and a vehicle’s speed. The contact pressure takes more effect on the harvested electric power and stress on pavement than the vehicle’s speed. A PHU of 280*280*20mm can harvest about 10mJ electric power when the contact pressure is 0.85MPa. That shows that application of the piezoelectric harvesting unit has very nice optimistic prospects.

Material Selection Based on Finite Element Method in Customized Iliac Implant

Materials Science Forum ◽

10.4028/www.scientific.net/msf.1000.82 ◽

2020 ◽

Vol 1000 ◽

pp. 82-89

Author(s):

Dhyah Annur ◽

Muhammad S. Utomo ◽

Talitha Asmaria ◽

Daniel P. Malau ◽

Sugeng Supriadi ◽

...

Keyword(s):

Finite Element Method ◽

Finite Element ◽

Material Selection ◽

Potential Candidate ◽

Basic Study ◽

Common Location ◽

Weight Support ◽

Natural Geometry ◽

Osteosarcoma, as the most frequent bone tumor cases, can be found in the pelvis bone. Within the pelvis, the ilium is the most common location for osteosarcoma, followed by the acetabulum and then the ischium. Surgery of pelvis is difficult and the reconstruction is complicated mainly due to the geometry complexity and also the weight support function of the pelvis. Endoprosthesis of the ilium is therefore designed to increase the quality of life of the patient. In this study, the iliac implant is designed based on the natural geometry of the ilium, and the size is modified to fit the morphometry of the Eastern Asian. A finite element method (FEM) is proposed as a basic study in material selection. Titanium and its alloy (Ti-6Al-4V) are studied as the potential candidate for the proposed implant while the finite analysis of the bone was also included. As a preliminary study, in this FEM, only the static load is given, each material is assumed to be isotropic and the contacts were considered bonded. FEM in this study is expected to give a better understanding of the stress distribution, and to optimize the selection of materials.

Reconstruction of the Main Cylinder of Carding Machine-Optimization of Dimensions with the Use of the Finite Element Method

Archive of Mechanical Engineering ◽

10.2478/v10180-012-0010-5 ◽

2012 ◽

Vol 59 (2) ◽

pp. 199-211 ◽

Cited By ~ 1

Author(s):

Piotr Danielczyk ◽

Jacek Stadnicki

Keyword(s):

Finite Element Method ◽

Finite Element ◽

Parametric Design ◽

Optimal Solution ◽

Deflection Amplitude ◽

Textile Technology ◽

Carding Machine ◽

Reconstruction of the Main Cylinder of Carding Machine-Optimization of Dimensions with the Use of the Finite Element MethodThe following paper presents the solution to the problem of searching the best shape - structural form of the bottoms and optimal dimensions of the main cylinder of the carding machine with consideration to the criterion of minimal deflection amplitude. The ANSYS package of the Finite Element Method has been used for the analysis. Polak-Ribery conjugate gradient method has been applied for searching the optimal solution, basing on the parametric model of the cylinder written with the use ofAnsys Parametric Design Language.As a result of the performed analyses, reduction of maximum deflection value at approximately 80% has been obtained. Optimal cylinder dimensions enable application of a new textile technology - microfibre carding and improvement in the quality of traditional carding technology of woollen and wool-like fibres.