A Numerical Simulation of Elastoplastic Contact Analysis of Compressor by Overspeeding

This study analyzes the stress distribution of 3D elastoplastic contact problems by using the FE parametric quadratic programming (PQP) method derived from a 3D FE model based on parametric variational principle (PVP). We numerically analyze a 24-blade compressor by combining centrifugal loading with interference-fit one. To accelerate computation, calculation is simplified by structural modeling via multisubstructuring, aiming to deal with FE-simulated computer aided design (CAD) conveniently. We then analyze the relationships between the maximum residual stresses of the compressor posterior to prestressing and overspeed rpms, and we also study the distribution and magnitude of the contact stresses of the compressor in working conditions after overspeed prestressing. Moreover, we thoroughly discuss the distribution and magnitude of the contact stresses of shaft-shaft sleeve-impeller in working conditions. Relative displacement can be prevented and contact stress can be kept uniform due to the nonuniform initial amount of interference in overspeed prestressing. This paper summarizes the FEM simulation results and provides reference data for improving the design and processing of compressor impellers, indicating that overspeed is indispensable in manufacture.

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Determination of the Milling Conditions of a Pump Casing Cover Using a Parametric Designed Fixture Device

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.809-810.890 ◽

2015 ◽

Vol 809-810 ◽

pp. 890-895

Author(s):

Ionuţ Ghionea ◽

Adrian Ghionea ◽

Saša Ćuković ◽

Nicolae Ionescu

Keyword(s):

Working Conditions ◽

Computer Aided Design ◽

Fem Analysis ◽

Milling Process ◽

Milling Tool ◽

Cutting Force Components ◽

Force Components ◽

Aided Design ◽

Tool Diameter

This paper presents an applicative methodology of parametric computer aided design using the CATIA v5 software to model and assembly a modular fixture device. The device is then used in the orientation and clamping a part of type casing cover which has a face machined by milling. Having a constructive solution of the fixture device, the next step is to simulate a milling process through a FEM analysis to identify the working conditions: milling tool diameter, number of teeth, cutting forces, required power of the machine tool etc. Some parameters were chosen according to various tools manufacturers catalogues and the cutting force components were determined experimentally in laboratory conditions. The analysis results show that in the FEM simulated milling process, in all the fixture device parts, some tensions cause displacements that have an influence over the casing cover surface roughness.

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Design, Analysis and Fabrication of High Clearance Self- Propelled Foliar Applicator

Current Journal of Applied Science and Technology ◽

10.9734/cjast/2020/v39i4831245 ◽

2020 ◽

pp. 367-378

Author(s):

Pankaj Malkani ◽

Sunil Kumar Rathod ◽

K. R. Asha ◽

Tapan Kumar Khura ◽

H. L. Khuswaha

Keyword(s):

Computer Aided Design ◽

Simulation Analysis ◽

Foliar Application ◽

Nutrient Use Efficiency ◽

Fem Simulation ◽

Von Mises Stress ◽

Maximum Deformation ◽

Nutrient Use ◽

Von Mises ◽

Aided Design

In this paper Finite element method (FEM) for design and development of self- propelled foliar applicator is presented. Foliar application is a method for feeding nutrients directly to plants for enhancing nutrient use efficiency through foliar applicator. The major components of the foliar applicator were engine (3.5 kW), gearbox (4F+1R), chassis (1.2 x 0.96 m2), sub-frame assembly, spraying diaphragm pump (Model-SFWP1-055-070-31, capacity 20 lm-1 at 4.4 bar), fertilizer storage tank (225 l). The main objective of this FEM simulation analysis is to find out the stress, deformation and strain induced in chassis and sub-frame assembly of foliar applicator for given boundary condition. A Computer Aided Design of foliar applicator was developed using Creo-parametric 1 software and then analyzed in FEM mode by using Creo simulation1 software. FEM static analysis resulted in maximum von mises stress 200.750MPa and182.638MPa, maximum deformation 2.81 mm and 1.29 mm and max strain 0.001047 and 0.000636 for chassis and sub-frame assembly respectively. Maximum stresses in both didn’t exceed the respective yield points which signified designs, can be used for fabrication.

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The Material Flow Analysis in the Modified Orbital Forging Technology

Materials Science Forum ◽

10.4028/www.scientific.net/msf.654-656.1622 ◽

2010 ◽

Vol 654-656 ◽

pp. 1622-1625 ◽

Cited By ~ 3

Author(s):

Jaroslaw Nowak ◽

Łukasz Madej ◽

Franciszek Grosman ◽

Maciej Pietrzyk

Keyword(s):

Material Flow ◽

Computer Aided Design ◽

Flow Analysis ◽

Material Flow Analysis ◽

Element Model ◽

Fe Model ◽

Forming Process ◽

Change Effect ◽

Aided Design ◽

Orbital Forging

The main aim of this work is the computer aided design of the new orbital forging process. The finite element model was developed and used in research on possibility of modification of the classical orbital forging technology based on the Marciniak press to obtain more effective process. Obtained numerical results from simulations of the new orbital process are compared with the experimental analysis, performed on the orbital press with the developed device. However, due to the novelty of the developed approach the investigation on direction of material flow during deformation is of particular interest in this work. Direction of material flow and strain path change effect due to incremental character of deformation is analyzed. Obtained results confirm good predictive capability of the FE model and are the basis for the comparison of the two processes and discussion on the effectiveness of the modified incremental forming process.

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Effect of Endocrown Restorations with Different CAD/CAM Materials: 3D Finite Element and Weibull Analyses

BioMed Research International ◽

10.1155/2017/5638683 ◽

2017 ◽

Vol 2017 ◽

pp. 1-10 ◽

Cited By ~ 5

Author(s):

Laden Gulec ◽

Nuran Ulusoy

Keyword(s):

Finite Element ◽

Failure Probability ◽

Computer Aided Design ◽

Weibull Function ◽

Fe Model ◽

3D Finite Element ◽

Cad Cam ◽

Von Mises ◽

Aided Design

The aim of this study was to evaluate the effects of two endocrown designs and computer aided design/manufacturing (CAD/CAM) materials on stress distribution and failure probability of restorations applied to severely damaged endodontically treated maxillary first premolar tooth (MFP). Two types of designs without and with 3 mm intraradicular extensions, endocrown (E) and modified endocrown (ME), were modeled on a 3D Finite element (FE) model of the MFP. Vitablocks Mark II (VMII), Vita Enamic (VE), and Lava Ultimate (LU) CAD/CAM materials were used for each type of design. von Mises and maximum principle values were evaluated and the Weibull function was incorporated with FE analysis to calculate the long term failure probability. Regarding the stresses that occurred in enamel, for each group of material, ME restoration design transmitted less stress than endocrown. During normal occlusal function, the overall failure probability was minimum for ME with VMII. ME restoration design with VE was the best restorative option for premolar teeth with extensive loss of coronal structure under high occlusal loads. Therefore, ME design could be a favorable treatment option for MFPs with missing palatal cusp. Among the CAD/CAM materials tested, VMII and VE were found to be more tooth-friendly than LU.

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