scholarly journals Separately global solutions to rate-independent processes in large-strain inelasticity

2022 ◽  
Vol 215 ◽  
pp. 112668
Author(s):  
Elisa Davoli ◽  
Martin Kružík ◽  
Petr Pelech
2008 ◽  
Vol 12 (3) ◽  
pp. 203-228 ◽  
Author(s):  
Said Taïbi ◽  
Jean-Marie Fleureau ◽  
Sigit Hadiwardoyo ◽  
Siba Kheirbek-Saoud

Author(s):  
Ajay Bhushan Prasad

21<sup>st</sup> Century is an era of stress and burnout. For the past few decades it has been a burning and hot topic of discussion for researchers, to evolve stress and burnout- from a global problem to global solutions, as it affects the life of individuals in an unprecedented manner and touches them at workplace across the globe. Everybody knows what stress is all about. It has become a part of life and perhaps, to some extent, necessary at work and outside work. Some people are more productive and creative when they work under stress. But if stress is intense and continuous, then it becomes a negative phenomenon leading to physical illness and psychological disorders. Stress and burnout in today's environment has become a well documented problem. Various researches have evaluated stress and burnout in workplaces. Stress is a non-specific response of body to any demand made on it. Many researchers have identified that stress and burnout has become an integral part of our daily life due to the negative aspects of job, such as, multiple responsibilities, disciplinary problems, employee's apathy, involuntary transfers, inadequate pay and perks, less chances of career advancement and lack of administrative support etc. As a result of these, individuals are likely to suffer from stress and may experience a sense of tiredness and frustration. When prolonged stress continues and it is not effectively managed, it can even lead to symptoms of burnout, a state of emotional exhaustion, depersonalization and diminished personal accomplishment in the workplace. Stress management can be done through six zones which we have discussed in detail, with a holistic approach. It includes health zone, intimate zone, family zone, work zone, social zone and spiritual zone. In this paper, an effort is made to discuss the solutions of stress and burnout in different and innovative ways through different zones which have been experienced by the author in his 20 years of professional career. Thus, stress and burnout are not a trivial problem but a major dysfunction of the 21<sup>st</sup> century, which has far reaching impact on quality and quantity of productivity. The present paper explores the concept of stress and burnout, the major differences between them, factors leading to genesis of the problem, various symptoms and how it is a serious quality concern for all professionals. Appropriate interventions for prevention and management of stress and burnout are also suggested.


1990 ◽  
Vol 57 (2) ◽  
pp. 298-306 ◽  
Author(s):  
K. W. Neale ◽  
S. C. Shrivastava

The inelastic behavior of solid circular bars twisted to arbitrarily large strains is considered. Various phenomenological constitutive laws currently employed to model finite strain inelastic behavior are shown to lead to closed-form analytical solutions for torsion. These include rate-independent elastic-plastic isotropic hardening J2 flow theory of plasticity, various kinematic hardening models of flow theory, and both hypoelastic and hyperelastic formulations of J2 deformation theory. Certain rate-dependent inelastic laws, including creep and strain-rate sensitivity models, also permit the development of closed-form solutions. The derivation of these solutions is presented as well as numerous applications to a wide variety of time-independent and rate-dependent plastic constitutive laws.


2015 ◽  
Vol 1114 ◽  
pp. 143-148
Author(s):  
Nicolae Serban ◽  
Doina Răducanu ◽  
Vasile Danut Cojocaru ◽  
Nicolae Ghiban

Severe plastic deformation (SPD) has received enormous interest over the last two decades as a method capable of producing fully dense and bulk ultra-fine grained (UFG) and nanocrystalline (NC) materials. Significant grain refinement obtained by SPD leads to improvement of mechanical, microstructural and physical properties. Compared to classical deformation processes, the big advantage of SPD manufacturing techniques, represented in particular by equal channel angular pressing (ECAP) is the lack of shape-change deformation and the consequent possibility to impart extremely large strain. In ECAP processing, the workpiece is pressed through a die in which two channels of equal cross-section intersect at an angle of ϕ and an additional angle of ψ define the arc of curvature at the outer point of intersection of the two channels. As a result of pressing, the sample theoretically deforms by simple shear and retains the same cross-sectional area to allow repeated pressings for several cycles. A commercial AlMgSi alloy was investigated in our study. The specimens were processed at room temperature for multiple passes, using three different ECAP dies. All samples (ECAP processed and as-received) were subjected to metallographic analysis and mechanical testing. Several correlations between the main processing parameters and the resulting microstructural aspect and mechanical features for the processed material were established. It was shown that severe plastic deformation by means of ECAP processing can be used in aluminum alloys microstructural design as an advanced tool for grain refinement in order to attain the desired microstructure and mechanical properties.


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