Browsing by Author "Guerrache, Fadila"

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    Axisymmetric frictionless contact between an elastic layer thickness and a circular base under a rigid punch
    (SAGE, 2023) Guerrache, Fadila; Boutoutaou, Hamid; Hachemi, Madjid
    The study presented in this work deals with analytical methods for an axisymmetric problem of an elastic layer partially reposing on a rigid circular base, and is indented along the upper surface with a rigid punch. The contact between the medium and the base is smooth. This boundary value problem is transformed into a system of dual integral equations. In contrast to the classical approach consisting in resolving the corresponding Fredholm equation of the second kind, the latter equations are obtained from an infinite algebraic system of simultaneous equations, where the particular case (Formula presented.) is verified. The results of this system are also obtained numerically. The normal displacement, normal stress, and the stress singularity factor are given analytically and shown graphically with discussion. By comparison with those predicted by the finite element method, the accuracy of the numerical method is approved
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    Optimization of contact surfaces in assembly in the presence of form defects and interference
    (Springer Nature, 2023) Bedlaoui, Allal; Boutoutaou, Hamid; Guerrache, Fadila
    Shrink-fit assembly is one of the most important mechanical assembly methods. It has been used for many years because it is economical due to it needing only two components an axis and a hub, as the outer diameter of the axis is greater than the inner diameter of the hub and the difference between them is the “interference.” The shrink-fit assembly is used in several fields such as the manufacture of aircraft, cars, and connecting oil and gas pipelines. Assembly is achieved either by heating the hub and cooling the axis or by force. When assembling, contact pressure is formed on the contact area between the axis and the hub. Usually, the contact area is considered perfect, but in reality, it contains defects that vary in amplitude and number. In this article, we study the role of the form defect and interference in the 3D assembly by studying its effect on the extraction force and assembly coherence, with use numerical simulation to confirm this. Component separation experiment was applied to validate the simulation results
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