scholarly journals Gas molding of structure parts at non-linear ductile deformation of anisotropic materials

2020 ◽  
Vol 0 (4) ◽  
pp. 18-21
Author(s):  
Vladimir Chudin ◽  
Sergey Larin
Keyword(s):  
Equilibrium Equation ◽  
Local Deformation ◽  
Gas Pressure ◽  
Ductile Deformation ◽  
Material Damage ◽  
Technological Parameters ◽  
Critical Deformation ◽  
Deformation Stability ◽  
Non Linear ◽  
Operation Duration

There are offered correlations for the computation of gas shaping technological parameters of structure elements. A state of material non-linear viscosity (creep) is accepted. The energetic equilibrium equation, equations of damage capacity and a criterion of local deformation stability are used. There is computed gas pressure, operation duration (time), material damage capacity, critical deformation at the formation of volume casing. Product samples are presented.

Determination of Optimum Process Parameters in Gas-Assisted Injection Molding

2011 ◽  
Vol 143-144 ◽  
pp. 494-498
Author(s):  
Ke Ming Zi ◽  
Li Heng Chen
Keyword(s):  
Injection Molding ◽  
Delay Time ◽  
Optimization Design ◽  
Gas Pressure ◽  
Optimum Process ◽  
Injection Molding Process ◽  
Technological Parameters ◽  
Molding Process ◽  
Element Analysis ◽  
Melt Temperature

With finite element analysis software Moldflow, numerical simulation and studies about FM truck roof handle were conducted on gas-assisted injection molding process. The influences of melt pre-injection shot, gas pressure, delay time and melt temperature were observed by using multi-factor orthogonal experimental method. According to the analysis of the factors' impact on evaluation index, the optimized parameter combination is obtained. Therefore the optimization design of technological parameters is done. The results show that during the gas-assisted injection molding, optimum pre-injection shot is 94%,gas pressure is 15MPa,delay time is 0.5s,melt temperature is 240 oC. This study provided a more practical approach for the gas-assisted injection molding process optimization.

scholarly journals Investigation of sectional operating elements for conveying agricultural materials

2020 ◽  
Vol 66 (No. 1) ◽  
pp. 18-26
Author(s):  
Roman Hevko ◽  
Roman Rohatynskyi ◽  
Myroslav Hevko ◽  
Oleh Lyashuk ◽  
Oleksandra Trokhaniak
Keyword(s):  
Experimental Investigation ◽  
Experimental Studies ◽  
Design Parameters ◽  
Radius Of Curvature ◽  
Material Damage ◽  
Technological Parameters ◽  
Screw Conveyer ◽  
Operating Element ◽  
Processing Line ◽  
Agricultural Materials

The paper covers the results of the theoretical and experimental investigation of the developed sectional operating element of a flexible screw conveyer designed for transporting bulk agricultural materials. In order to determine the correlation between the design parameters of the hinged screw sections and the minimum permissible radius of curvature of a processing line, the analytical dependences have been deduced. The results of the experimental studies aimed at determining the efficiency of a screw conveyer and the level of the grain material damage depending on the change in design, kinematic and technological parameters of an operating element are presented.

Piezoelectrical Properties of Plasma Layers Zn-Bi-O

2006 ◽  
Vol 9 (2) ◽  
Author(s):  
Daniel Dopierała ◽  
Jan Ziaja
Keyword(s):  
Thin Films ◽  
Zinc Oxide ◽  
Piezoelectric Properties ◽  
Gas Pressure ◽  
Thin Layers ◽  
Technological Parameters ◽  
Reactive Gas

AbstractThe paper presents specific piezoelectric properties of thin layers of zinc oxide modified with bismuth (Zn-Bi-O). The purpose of the presented work was to find the relation between the technological parameters of receiving thin films (density power deposited on target, reactive gas pressure, distance from the substrate to the target) and the piezoelectric properties d

LOCAL AND INTERACTIVE POST-BUCKLING OF RHS THIN-WALLED MEMBERS — COMPARING A NEW SPECIAL BEAM FINITE ELEMENT WITH SHELL FE MODELS

2007 ◽  
Vol 07 (02) ◽  
pp. 213-241 ◽  
Author(s):  
HERVE DEGEE ◽  
NICOLAS BOISSONNADE ◽  
BARBARA ROSSI
Keyword(s):  
Finite Element ◽  
Local Buckling ◽  
Linear Analysis ◽  
Local Deformation ◽  
Theoretical Formulation ◽  
Non Linear ◽  
Beam Displacement ◽  
Post Buckling ◽  
Thin Walled ◽  
Global And Local

This paper presents a special thin-walled plane beam finite element that accounts for the in-plane cross-section local deformation. The element is based on the superposition of a classical beam displacement field and of an additional field describing local effects, with an approximation on the local second-order membrane stress field. The theoretical formulation is summarized and an application of the resulting numerical tool to the post-buckling analysis of RHS thin-walled members with moderate local and global slenderness susceptible to both global and local buckling is then performed. Different types of analyses are presented (computation of critical bifurcation loads, geometrically non-linear analysis, geometrically and materially non-linear analysis). The results obtained with the proposed beam finite element are compared to values provided by shell FE models.

scholarly journals Exact analytic solutions of the porous media and the gas pressure diffusion ODEs in non-linear mechanics

2007 ◽  
Vol 42 (1) ◽  
pp. 157-163 ◽  
Author(s):  
Dimitrios E. Panayotounakos ◽  
Anastasia B. Sotiropoulou ◽  
Nikos B. Sotiropoulos ◽  
Manos Manios
Keyword(s):  
Porous Media ◽  
Analytic Solutions ◽  
Gas Pressure ◽  
Pressure Diffusion ◽  
Exact Analytic Solutions ◽  
Non Linear ◽  
Non Linear Mechanics

PHENOMENOLOGICAL MAGNETORESISTANCE THEORY OF FE3F4 FILMS DOPED BY TRANSITION METAL

2007 ◽  
Vol 21 (18n19) ◽  
pp. 3418-3424
Author(s):  
J. LIU ◽  
X. Q. WANG ◽  
A. P. LIU ◽  
H. N. DONG ◽  
Y. LIU ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Transition Metal ◽  
Theoretical Analysis ◽  
Applied Field ◽  
Technological Parameters ◽  
Granular Films ◽  
Half Metals ◽  
Non Linear

Microstructures of the Fe 3 F 4 granular films doped by transition metal (TM) were analyzed and the phenomenological magnetoresistance theory was proposed in this paper. Influences of technological parameters including the temperature (T), the applied field (H) and the content (x) on the magnetoresistance (MR) are analyzed in detail. Through theoretical analysis, there are the following conclusions. Firstly, variations of MR with x are non-linear and MR may arrive at the maximum at a certain x. Secondly, MR decreases strongly with the increase of T, but the decreases may be reduced by doped TM. Then doped TM can help to improve electric and magnetic properties of half metals. Thirdly, MR increases with the increase of H when the magnetization of grains is unsaturated.

Isothermal extrusion of ribs on plate

2020 ◽  
pp. 158-161
Author(s):  
A.A. Pasynkov
Keyword(s):  
Equilibrium Equation ◽  
Displacement Velocity ◽  
Material Damage ◽  
Isothermal Heating ◽  
Operating Modes ◽  
Calculation Results ◽  
Isothermal Extrusion ◽  
Discontinuous Displacement

Technological schemes and relationships are given for calculating of operating modes during isothermal heating of workpieces. The conditions of viscoplastic non-stationary deformation are accepted. The energy form equilibrium equation as applied to the discontinuous displacement velocity fi eld and material damage kinetics equations are used. The calculation results and product samples are presented.

B. The Non-Linear Calculations for Pulsating Stars

1967 ◽  
Vol 28 ◽  
pp. 105-176
Author(s):  
Robert F. Christy
Keyword(s):  
Major Part ◽  
Afternoon Session ◽  
Discussion Session ◽  
Pulsating Stars ◽  
Fourth Symposium ◽  
Non Linear ◽  
Considerable Discussion ◽  
Informal Approach ◽  
Preceding Session

(Ed. note: The custom in these Symposia has been to have a summary-introductory presentation which lasts about 1 to 1.5 hours, during which discussion from the floor is minor and usually directed at technical clarification. The remainder of the session is then devoted to discussion of the whole subject, oriented around the summary-introduction. The preceding session, I-A, at Nice, followed this pattern. Christy suggested that we might experiment in his presentation with a much more informal approach, allowing considerable discussion of the points raised in the summary-introduction during its presentation, with perhaps the entire morning spent in this way, reserving the afternoon session for discussion only. At Varenna, in the Fourth Symposium, several of the summaryintroductory papers presented from the astronomical viewpoint had been so full of concepts unfamiliar to a number of the aerodynamicists-physicists present, that a major part of the following discussion session had been devoted to simply clarifying concepts and then repeating a considerable amount of what had been summarized. So, always looking for alternatives which help to increase the understanding between the different disciplines by introducing clarification of concept as expeditiously as possible, we tried Christy's suggestion. Thus you will find the pattern of the following different from that in session I-A. I am much indebted to Christy for extensive collaboration in editing the resulting combined presentation and discussion. As always, however, I have taken upon myself the responsibility for the final editing, and so all shortcomings are on my head.)

Application Of Electron Probe Analyses Of Minerals In Discussing The Relationship Between Ductile Deformation And Metamorphism

1990 ◽  
Vol 48 (2) ◽  
pp. 250-251
Author(s):  
Fan Guochuan ◽  
Sun Zhongshi
Keyword(s):  
Chemical Composition ◽  
Shear Deformation ◽  
Electron Probe ◽  
General Rule ◽  
Granulite Facies ◽  
Ductile Deformation ◽  
Higher Temperature ◽  
Ductile Shear ◽  
The Relationship ◽  
Ductile Shear Deformation

Under influence of ductile shear deformation, granulite facies mineral paragenesis underwent metamorphism and changes in chemical composition. The present paper discusses some changes in chemical composition of garnet in hypers thene_absent felsic gnesiss and of hypersthene in rock in early and late granulite facies undergone increasing ductile shear deformation .In garnet fetsic geniss, band structures were formed because of partial melting and resulted in zoning from massive⟶transitional⟶melanocrate zones in increasing deformed sequence. The electron-probe analyses for garnet in these zones are listed in table 1 . The Table shows that Mno, Cao contents in garnet decrease swiftly from slightly to intensely deformed zones.In slightly and moderately deformed zones, Mgo contents keep unchanged and Feo is slightly lower. In intensely deformed zone, Mgo contents increase, indicating a higher temperature. This is in accord with the general rule that Mgo contents in garnet increase with rising temperature.

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