In the present article a particular intermediate class of thin-walled beam cross-sections is studied. The cross-section of the beam is closed, but the shape of cross-section is elongated in its plane and curved. The walls, which form the cross-section, are nearly equidistant. The Saint-Venant free torsion behavior of the beam is similar to the behavior of closed cross-section beams. A technical theory of thin-walled rods with semi-opened profile can be based on the following set of hypotheses of the kinematic and static nature. The pure torsion behavior of such profiles is in some aspects similar to mechanical behavior of thin-walled beams with closed cross-sections, while the warping function and restricted torsion behavior of these beams is analogous to those of open cross-sections. The application of the semi-opened profile is the twist beam for semi-solid automotive suspensions. The advantage of the semi-solid axle is its simplicity and maintenance. The disadvantages of the semi-solid axle are the induced effects of suspension stiffness on wheel orientation and oversteer due to deformation of suspension. The longitudinal location of the cross beam controls important parameters of the suspension's behavior, such as the roll steer curve and toe and camber compliance. The closer the cross beam to the axle stubs the more the camber and toe change under deflection. The twist beam, on the one hand, and conventional independent suspension, on the other hand, behave differently under the load. Namely, the changes of camber and toe under the side load are different for these types of suspensions. The changes in camber and toe are dependent on the relative position of the wheels. In a conventional independent suspension the camber and toe are based on the position of the wheel with respect to the body. If both wheels compress together, their camber and toe will not change. Thus, if midplanes of both wheels in free state are perpendicular to the road and car compressed them together the wheels will stay perpendicular to the road. The camber and toe changes are the result of one wheel being compressed relative to the other. The twist beam suspension behaves in a more complicated fashion. The side load leads to oversteer. The oversteer could be significant if the bending stiffness rz of twist beam is not high enough. The increasing of the bending stiffness, however, leads to the high torsion stiffness r, and the roll stiffness of the vehicle. The growing roll stiffness alters the dynamics of car and is generally detrimental.The simple analytical model is essential for preliminary design purposes and estimation of several contradictory static effects. For this purpose, we express in the article analytically the effective torsion stiffness rt, effective bending stiffness rz, and effective bending spring rate rc of the twist beam in terms of section properties of the twist beam with semiopened cross-section.


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    Titel :

    Thin-walled rods with semiopened profiles


    Weitere Titelangaben:

    Dünnwandige Stäbe mit halboffenen Profilen


    Beteiligte:
    Kobelev, V. (Autor:in)

    Erschienen in:

    Erscheinungsdatum :

    2013


    Format / Umfang :

    13 Seiten, 16 Bilder, 8 Tabellen, 31 Quellen




    Medientyp :

    Aufsatz (Zeitschrift)


    Format :

    Print


    Sprache :

    Englisch




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