Observations on the Use of Friction Factor Maps in Metal Forming

2014 ◽  
Vol 797 ◽  
pp. 111-116
Author(s):  
Ana Maria Camacho ◽  
Ana Isabel Torralvo ◽  
Claudio Bernal ◽  
Lorenzo Sevilla

In metal forming simulation the right definition of friction conditions at the tool-workpiece interface is a key matter, in order to obtain reliable results. The aim of the present work is the determination of friction factor maps by using the RCT with different alloys which are commonly used in the metal forming practice; and the subsequent comparison of the curves to probe if there are important deviations among different materials, which will lead to prevent the use of a unique and general map of friction curves for all materials. Results confirm the necessity of using a friction calibration map for each material. Furthermore the differences and similarities in the behaviour observed are evaluated for all materials.

2021 ◽  
Vol 15 (57) ◽  
pp. 828-851
Author(s):  
Larissa Fernanda De Alencar Souza ◽  
Juracy Marques dos Santos

Resumo: O trabalho em epígrafe visa discutir as relações que se estendem entre os direitos culturais e a Ecologia Humana. De forma bibliográfica e analítica, apresentamos o percurso que leva da definição de cultura aos direitos culturais. Dentro dessa discussão, analisamos a Declaração Universal dos Direitos Humanos como primeiro passo de promoção dos direitos culturais, importante para aprofundamento da discussão e extensão no devido debate. Num segundo momento, destacam-se os direitos culturais e políticas públicas culturais no Brasil, apresentando um histórico que passa pela constituição a aplicação de direitos culturais por meio das políticas públicas desenvolvidas. Por conseguinte, se discute a Ecologia humana em seu âmbito de Ecologia Cultural, em favor de analisar a importância de direitos culturais dentro desta matéria. Com base na Declaração de Friburgo, documento internacional que versa sobre a aplicação de direitos culturais, essa análise se dará através de 3 aspectos: a autodeterminação dos povos, o direito a identidade e patrimônio cultural, e os princípios de governança democrática. Assim, compreendemos que a ecologia humana cultural e os direitos culturais possuem uma relação mútua e interdependente para alcançar seus objetivos. Palavras-chave: Ecologia Cultural; Direitos Humanos; Autodeterminação dos Povos; Governança Democrática. Abstract: The above work aims to discuss the relationships that extend between cultural rights and Human Ecology. In a bibliographical and analytical way, we present the path that leads from the definition of culture to cultural rights. Within this discussion, we analyze the Universal Declaration of Human Rights as a first step in promoting cultural rights, which is important for deepening the discussion and extending the due debate. In a second moment, cultural rights and cultural public policies in Brazil stand out, presenting a history that goes through the constitution and application of cultural rights through the developed public policies. Therefore, human ecology is discussed in its scope of cultural ecology, in favor of analyzing the importance of cultural rights within this matter. Based on the Friborg Declaration, an international document that deals with the application of cultural rights, this analysis will be carried out through 3 aspects: the self-determination of peoples, the right to identity and cultural heritage, and the principles of democratic governance. Thus, we understand that cultural human ecology and cultural rights have a mutual and interdependent relationship to achieve their goals. Keywords: Cultural Ecology; Human Rights; Self-determination of People; Democratic Governance. 


2012 ◽  
Vol 268-270 ◽  
pp. 430-435 ◽  
Author(s):  
Xin Wu Ma ◽  
Guo Qun Zhao ◽  
Wen Juan Li

A new method for determination of friction coefficient in sheet metal forming of Mg alloy AZ31B is presented in this paper. The method is based on the bulging test of sheet metal in which the specimen is processed with a hole at the center. The diameter of the hole will increase along the stroke of the punch and the dimensional change of the hole has a certain relationship with the friction coefficient at the punch/specimen interface. Thus, the friction coefficient can be determined indirectly according to the dimension of the hole in the bulging process. The bulging process of the sheet is simulated using FE code DEFORM-2D. The analysis model is set up according to the experiment of the bulging and the friction calibration curves are generated from the simulations of the bulging by setting different coefficients of friction. The friction coefficient can be determined by measuring the hole dimension during the bulging process and comparing it with the friction calibration curves.


Dr P . Hall has kindly pointed out an error in § 2 of the paper; namely, that (2.10a) renders X complex whenever a is complex, so that inter alia a spatial growth or decay can appear in Ein (2.9). The following alterations and reinterpretations correct for this fault and some minor misprints. Equation (2.10a) should read ‘X( = X ) = h~2X X is then real and can be identified with X throughout the paper, while the terms multiplied by a 2 in (2.11), (2.12), (2.13c), (2.34a, d),(2.35), (2.37), (2.38) should be omitted. The sentence starting two lines below (2.106) should then be replaced by ‘Here, working with a wavenumber a. close to the neutral value a l5 we will keep the reference Reynolds number Re, length scale l*, frequency and velocity U* fixed and suppose that the position x = xx -f h2x2 under investigation is close to the neutral position x = xx for the particular fixed frequency disturbance considered. So the skin friction factor A = Aj + h2X + 0(h3)(2.106') is also slightly perturbed from the neutral value A = Al5 where Ax = from just below (2.2). Notice that this treatment of the nearly neutral state differs from that usually applied to parallel flows where the Reynolds number is usually varied instead’. From (2.106') onwards Ax should replace A. A term — A^ioq ZUX+ kj) should be added to the right side of (2.13c). Equation (2.146) should give U1-*XxA 1, ?72->A1A2but f^3->A1^43+ (2.17) should have A 1 = A 1(X)E-f-c.c. and the right sides of (2.30), (2.31) should be multiplied by —Ay1, Xj1 respectively. An extra term + + should be included in the right side of (2.32) and (2.34c) should have Ax 4- In (2.37) the term — 6AA31 should be replaced by — 6(A1^431 + A2H1) and — A^bX2A 1 should be added to the right side of (2.38). X should replace X in the definition of SF2{u, v,p), just above (2.13a), in TJXx in (2.136) and in U2x + U2 U


Author(s):  
N.V. Kuznetsova ◽  
L.P. Lapshina

The article presents an analysis of some issues of legal discretion. There is no unified approach either to the definition of discretion or to the legal nature of this phenomenon. There are difficulties in the evaluation of the legal discretion in acting legislature. In private law trial discretion comprises codified regulation. This phenomenon is particularly typical in contract law: the court’s assessment of the behavior of participants in contractual relations as lawful or unlawful, abuse of rights, determination of the nature of the legal norms governing contractual relations. The discretionary powers of the court in many respects make it possible to ensure uniformity in the consideration of cases of a certain category, to form judicial practice on the application of the relevant legislation. The main areas of judicial activity in this case are: making the right choice of the rule of law to be applied to qualify the relevant legal relationship, applying the analogy of law and as well as the legal position developed when resolving a certain category of cases.


2005 ◽  
Vol 41 (4) ◽  
pp. 691-703
Author(s):  
Jacob Finkelman

The author traces the origins and development of public sector negotiations in Canada. Heputs the accent on several aspects such as: the determination of bargaining units, the definition of what is negotiable, major problems encountered and ways of resolving them, the determining of essential services. In the light offorty years of experience, the author cornes to the conclusion that granting the right to strike in the public sector was a mistake. He also takes position against the merger ofthe Canadian Labour Relations Board (CLRB) and the Public Service Staff Relations Board (PSSRB).


Author(s):  
Inna LEVYTSKA

The article defines the most effective methods of managing hotel revenues and methods of their use, which in turn will create competitive advantages and make the sale of hotel services stable, and the activity of hotel enterprises more profitable. The concept of Revenue management in the hotel business is disclosed, which is a technology that determines the best price for hotel room on the basis of demand forecasting, that is, the sale of the necessary number to the client at the right moment at the right price. The basic pricing objectives of the hotel company have been developed, which should not be considered separately, but should be in line with the marketing strategy of the enterprise development. Interdependence of the level of loading of hotel rooms from the reduction of prices is determined. The obtained data testify that the price reduction even by 1% requires an increase in loading of hotel rooms by almost 1% to cover losses as a result of income reduction. The goal of the pricing strategy, aimed at achieving the goals as the services to be offered, are proposed, hotels are trying to outdo competitors by maximizing the quality of services. The principles, which should be used by hotel companies that master flexible pricing methods from the point of view of marketing complex: the choice of pricing policy should be closely related to the positioning of the hotel company services; A correlation of the pricing strategy with the definition of the stage of the life cycle, on which the hotel product is located, is very important for the process of formation of prices. The mechanism of calculation of sales prices for hotel services is offered. These approaches should be considered in the pricing policies of the hotel company, depending on the services they provide. The stages of the analysis are determined: market research, hotel product life cycle, task setting of pricing depending on the goals of the hotel company, determination of the marginal range of price fluctuations, determination of the most optimal range of prices. Analysis of prices and range of competitors' services, choice of method of pricing, adjustment of the basic price level, establishment of the final price. The method of "discriminatory pricing" is described and examples of the use of this method are given. The concept of "Price discrimination" is defined, which is a useful tool for smoothing the supply and demand, providing additional income and profit to most hospitality establishments. This method of pricing uses reductions / increases in prices to attract additional customers and revenue without lowering / raising prices for all. A detailed description of the multiplier effect method used in the calculation of prices. The essence of the multiplier method is to calculate the multiplier, which shows how many times the dependent factor (profit) increases or decreases if the independent factor is changed to one. The calculation of the budget based on the multiplicative method in the hotel "Ramada Lviv" was carried out. The number of indicators given in the calculations may increase depending on the specifics of the enterprise. Constant costs are the sum of personnel costs, operating costs, management, depreciation, etc., each of which is considered as an independent factor of impact on profits. Variable costs depend on the volume of goods turnover; therefore, they should include such expenses as additional wages, production raw materials, related and consumable materials. It is characterized by a revenue management system in a hotel that requires a reliable database. A good revenue management system will benefit the hotel and customer. Cost-effectiveness factors (fixed costs of fixed assets and operating costs, variable costs of services) have a completely different range of actions than market-oriented factors (price, cost of services, loading of numbers, etc.). It is determined that for hotels, comparing the influence of various factors on profit, it can be argued that the impact of trade turnover is more significant than the impact of costs. An estimation of the importance of the factors that create the multiplicative effect, which was ranked, depending on their impact on profit. It was found that prices, which are in close connection with all elements of the marketing complex, determine the profitability of the hotel company, its life cycle and financial stability. At the same time, the choice of pricing methods and pricing policies largely depends on the goals and strategies of the hotel company in the selected segment of the market. The proposed mechanism for calculating the sale price of a hotel company is based on a multiplicative method, which includes: the definition of key indicators that affect the profit, including prices; calculation of profit when changing these indicators; estimation of the importance of the impact on the profit of each selected indicator; the choice of the most appropriate variant of profit. The development of market relations in Ukraine and in advanced economies is somewhat similar, therefore, the generalization and dissemination of the best foreign and domestic income management experience based on marketing will improve the efficiency of the hotel industry. Prospects for further research are the development of new strategies aimed at gaining market share, improving hotel services, increasing consumer demand through the interaction of factors of price and quality, promotion of the brand, introduction of new forms of management, including franchising and management contracts, electronic sales of hotels services.


2019 ◽  
Vol 7 (1) ◽  
pp. 9-20
Author(s):  
Inna Yeung

Choice of profession is a social phenomenon that every person has to face in life. Numerous studies convince us that not only the well-being of a person depends on the chosen work, but also his attitude to himself and life in general, therefore, the right and timely professional choice is very important. Research about factors of career self-determination of students of higher education institutions in Ukraine shows that self-determination is an important factor in the socialization of young person, and the factors that determine students' career choices become an actual problem of nowadays. The present study involved full-time and part-time students of Institute of Philology and Mass Communications of Open International University of Human Development "Ukraine" in order to examine the factors of career self-determination of students of higher education institutions (N=189). Diagnostic factors of career self-determination of students studying in the third and fourth year were carried out using the author's questionnaire. Processing of obtained data was carried out using the Excel 2010 program; factorial and comparative analysis were applied. Results of the study showed that initial stage of career self-determination falls down on the third and fourth studying year at the university, when an image of future career and career orientations begin to form. At the same time, the content of career self-determination in this period is contradictory and uncertain, therefore, the implementation of pedagogical support of this process among students is effective.


2020 ◽  
Vol 10 (4) ◽  
pp. 85-90
Author(s):  
VLADIMIR TROYAN ◽  

The relevance of the interpretation of constitutional and legal guarantees of the right to vote is mediated by isolated scientific research in this area, as well as the lack of a universal approach to legal guarantees. In this regard, the purpose of the article is to argue and disclose the author’s definitive aspect of the claimed guarantees. In the work, the author named and characterized the normative (based exclusively on legal means) with the perspective of a branch of legal and technical; regulatory and institutional (combines the formal aspect with the activities of authorized entities) and associated legal (including a set of legal and other aspects) approaches to the definition of legal guarantees. Based on the second approach, as well as combining the guarantees of the right to vote directly guarantees of the subjective right itself and guarantees of its implementation, the author offers a definition of constitutional and legal guarantees of the right to vote.


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