Given that unloading manoeuvres in dump semi-trailers are associated with the loss of lateral stability in the vehicle, it has been evaluated that the risk of mechanical failure of the coupling components between the hydraulic cylinder and the box bed is due to an excessive torsional compliance of the dump body under unfavourable loading conditions. As a result of this, the necessity to establish an analysis methodology to quantify the dump bed rigidity against torsion loads has been set out. At first, a geometric analysis of the contact limits between the components comprising the hydraulic cylinder-dump body coupling has been carried out. It was concluded that the minimum contact angle α between the coupling parts is reached when the box is positioned at its maximum tipping angle β. Once this minimum contact angle α or maximum admissible box torsional turn angle γ was determined, a finite element model of a dump semi-trailer steel box was created to analyse its mechanical behaviour under torsion loads independent of the vehicle frame. It has been concluded that the torsional compliance of the box is higher when the load is applied on the front area of the box. For example, a total off-centre load corresponding to a value equal to 50% of the maximum allowable load for this kind of vehicle (according to Spanish transport regulations) (Reglamento General de Vehiculos, 1999), applied as a concentrated force on the front area of the box at a distance of 0.8 m from the box vertical symmetry plane, could lead to a torsional turn angle γ higher than the admissible limit. Nevertheless, the application of such a high magnitude force on such a small area is not very realistic, because materials usually transported by this kind of vehicles tend to load the box in a much more distributed way. On the contrary, the application of an off-centre load (separated by 0.8 m from the symmetry plane) distributed all over the length of the box, with a total magnitude equal to 50% of the maximum allowable load, reproduces a situation that is much more approximate to reality than the previous load case, simulating a better irregular unloading condition. In this case, a torsional turn angle equal to 65% of the admissible maximum angle or minimum contact angle has been obtained. Finally, the box torsional compliance for a complete finite element model of the dump semi-trailer has been analysed. In this case, not only has an off-centre load equal to 50% of the maximum allowable load been considered, a roll angle leading the vehicle to its static rollover threshold has also been simulated. A torsional turn angle equal to 45% of the minimum contact angle was obtained between the coupling components. It can be concluded that for the dump semi-trailer analysed, the occurrence of a mechanical failure of the coupling components due to torsional solicitations preceding the lost of lateral stability is not possible. In other words, the breakage of the coupling components joining the hydraulic cylinder rod end to the box could only take place after the vehicle's loss of lateral stability and its subsequent rollover. If the breakage of the coupling components occurred due to a faulty material or to a defective component and the vehicle were below its static rollover threshold, the dump semi-trailer would remain stable. Nevertheless, this situation would be potentially dangerous because the box front area could separate completely from the cylinder and fall over the semi-trailer frame. Depending on the dump box design, there exists the possibility that the torsional compliance of the box γ reaches a value higher than the admissible front turn angle between the coupling parts α. To ensure a safe design in this case, the manufacturer should use a different joint model for the coupling, able to permit the torsional compliance of the box without inappropriate contacts between their components.


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    Titel :

    Analysis of the torsional rigidity of a dump semi-trailer under unfavourable load conditions


    Beteiligte:
    Valladares, David (Autor:in) / Carrera, Marco (Autor:in) / Miralbes, Ramon (Autor:in) / Castejon, Luis (Autor:in)

    Erschienen in:

    Erscheinungsdatum :

    2014


    Format / Umfang :

    21 Seiten, Bilder, Tabellen, Quellen




    Medientyp :

    Aufsatz (Zeitschrift)


    Format :

    Print


    Sprache :

    Englisch




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