scholarly journals Comparative performance of some constitutive models in stress rotation

2019 ◽  
Vol 1 ◽  
pp. 1-11
Author(s):  
Fabian Schranz ◽  
Wolfgang Fellin ◽  
Dimitrios Kolymbas
Keyword(s):  
Constitutive Models ◽  
Comparative Performance ◽  
Stress Rotation

Development of a computational optimisation system to determine constitutive equation constants for metal alloys

2017 ◽  
Vol 233 (6) ◽  
pp. 1166-1183
Author(s):  
Nicholas J Politis ◽  
Denis J Politis
Keyword(s):  
Genetic Algorithm ◽  
Constitutive Equations ◽  
Hybrid Algorithm ◽  
Constitutive Models ◽  
Great Difficulty ◽  
Computationally Efficient ◽  
Comparative Performance ◽  
Wide Range ◽  
Hybrid Solver ◽  
Optimisation Methods

Simulations of metal forming processes typically use constitutive equations to describe material properties over a wide range of temperatures and strain rates. Classically, determining a set of values for the large number of constants present in more complex constitutive models presented great difficulty to researchers. In this paper, an algorithmic method of determining the constants of such constitutive equations is presented. The Genetic Algorithm implementation utilising MATLAB is described, and example fits to experimental data are presented. A study is performed to improve the performance of the method by combining the Genetic Algorithm and Particle Swarm optimisation methods into a hybrid algorithm and to exploit the inherent advantages of both methods of solution. Comparative performance between the GA-only and hybrid algorithm are presented, and it is found that such a Hybrid Solver is significantly more computationally efficient and produces more accurate parameter estimations.

Comparative performance of low-ability airmen

1970 ◽  
Author(s):  
Marvin E. Grunzke ◽  
Nancy Guinn ◽  
Glenn F. stauffer
Keyword(s):  
Comparative Performance ◽  
Low Ability

SME’s Performance Through Comparative Performance Indicators, Measured by Business Statistics- Albania Case

2017 ◽  
Vol 9 (1) ◽  
pp. 361
Author(s):  
Godiva Rembeci
Keyword(s):  
Economic Performance ◽  
National Economy ◽  
Performance Indicators ◽  
Future Research ◽  
Productivity Measurement ◽  
Comparative Performance ◽  
Global Consensus ◽  
Research Activities ◽  
Business Statistics ◽  
National Economies

Now days there is a global consensus among all stakeholders that SMEs represent a driving force to the overall economic development, due to their significant contribution both on GDP and employment of national economies. SMEs also by numbers dominate the world business stage, although their contribution does vary among the countries. SMEs in Albania represents about 98% of the total enterprises with a contribution to national GDP for about 70%. The structure and the performance of national economy is depended very much on the economic performance and contribution of SME, that’s why most of the governments have strategic programmes which support the SME’s development. To measure SMEs’ performance and their ability to compete on national and international markets requires a lot of information in all aspects. Through this paper the author aims to measure and analyze the economic performance of SMEs operating in Albania. To achieve this objective, official data on business statistics published by national the statistical office (INSTAT) are used for two years period 2014-2015. In addition using an international framework addressed to the objective “improve the techniques for SMEs productivity measurement”, for the first time, a set of comparative performance indicators is established and in doing so, those results can be used as term of reference in future research activities in SMEs sector. From the results it came out that although the positive growth rate of GDP during the last years , the performance indicators of SMEs show a slightly negative trend, indicating indirectly the need for support, in order to empower their contribution in national economy.

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