1,721,310 research outputs found
Interaction modeling based on human behavior classification
Full text linkThe variety of human behaviors makes user-product interaction difficult to manage and foresee, especially concerning users running into problems. This research considers several interaction problems and identifies recurring behaviors. Then, it highlights the users, products and environments' aspects corresponding to each of these behaviors. This makes possible foreseeing the behavior of specific users who run into problems while interacting with specific products in specific environments. The results are used to upgrade an existing user-product interaction modeling approach in order to make it able to suggest better-focused product improvements to designers as well as alternative problem solving to different users
Developments of some explicit formulas useful to describe elastic stress fields ahead of notches in plates
No full textThe paper deals with the evaluation of linear elastic stress fields in the neighbourhood of U- and V-shaped notches in plane plates. The main aim is to improve the accuracy of an approximate solution already proposed in the literature by changing the polynomial arrangement of complex potential functions and properly adapting the boundary conditions. In some special cases, the solution matches Williams, Westergaard-Irwin and Creager-Paris' equations universally used in the case of sharp corners, cracks, and blunt cracks, respectively. In the presence of notches with a tip radius different from zero and a large opening angle, the equations obtained are compared with finite element results, showing a very good agreement. Due to their reduced complexity, such equations turn out to be particularly useful when applied to rounded V-notches as well as welded-like geometries under mixed loading conditions. Finally, some limits of the solution when applied to the notch free edges are highlighted
A generalized stress intensity factor to be applied to rounded V-shaped notches
No full textIn the presence of sharp (zero radius) V-shaped notches the notch stress intensity factors (N-SIFs) quantify the intensities of the asymptotic linear elastic stress distributions. They are proportional to the limit of the mode I or II stress components multiplied by the distance powered 1 - lambda(i) from the notch tip lambda(i) being Williams' eigenvalues. When the notch tip radius is different from zero, the definition is no longer valid from a theoretical point of view and the characteristic, singular, sharp-notch field diverges from the rounded-notch solution very next to the notch. Nevertheless, N-SIFs continue to be used as parameters governing fracture if the notch root radius is sufficiently small with respect to the notch depth.
Taking advantage of a recent analytical formulation able to describe stress distributions ahead of rounded V-notches, the paper gives a generalized form for the notch stress intensity factors, in which not only the opening angle but also the tip radius dimension is explicitly involved. Such parameters quantify the stress redistribution due to the root radius with respect to the sharp notch case
Distributions of the elastic principal stress due to notches in finite size plates and rounded bars uniaxially loaded
No full textThe paper presents approximate expressions suitable for describing the elastic distribution of the maximum principal stress in plates and round bars subjected to uniaxial loads. The closed form expressions are valid over the entire ligament width and represent an extension of an analytical frame recently reported in the literature and valid only for the highly stressed zone surrounding the notch tip. Such an extension is obtained by simply imposing global equilibrium conditions, both to notched plates and axi-symmetric rounded bars. Existing analogies between the stress distributions induced by elliptic, slim parabolic and V-shaped notches are discussed on the basis of theoretical and numerical evidence. Finally, the accuracy of the new expressions has been examined against finite element results showing a good agreement
Nuove funzioni a potenziale complesso per il calcolo del campo di tensione in prossimità di intagli di diverso tipo
No full textDistribuzioni approssimate della tensione principale massima in piastre di larghezza finita con intagli circolari ed ellittici
No full textSoluzione approssimata del problema del primo ordine per intagli a V interessati da plasticità localizzata
No full textDefine and exploit guidelines for interactive redesign of products’ User eXperience
Full text linkNowadays, User eXperience (UX) is one of the main concerns in developing innovative products. This research develops the way to define and exploit guidelines for interactive redesign of the UX of products. Because of their origin, these guidelines will encompass all UX characteristics reputed as meaningful like usefulness, subjective feelings, motivational aspects, emotions, etc.; moreover, the redesign suggestions offered by these guidelines, as well as the procedures to collect and analyse the data to define other guidelines and suggest the best ways to implement them, push different competencies (engineers, UX experts, psychologists, etc.) to work in synergy, just like an interactive design context requires
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