Rigid, polyurethane foam filling is currently being used for NVH (Noise, Vibration and Harshness) improvement in many automobiles The improvement is typically achieved by the injection of the rigid polyurethane foam into the thin-walled, hollow sections of the body members such as the pillars and rocker panels The foam seals the cavities thereby blocking the transmission and amplification of wind, engine and road noises Also by increasing the stiffness of the members and the joints, the body natural frequencies are increased thereby reducing the vibrationAnother potential application of the rigid polyurethane foam is strength improvement of the body structures Thin-walled, hollow sections are inherently susceptible to buckling due to section collapse When filled with the rigid polyurethane foam, the section collapse can be significantly reduced thereby increasing the strength of such structures, in addition to the demonstrated NVH improvementBending tests (4-point) of foam-filled steel sections were performed to show the effectiveness of various densities of foam in improving the strength in the flexural mode These tests were replicated in nonlinear finite element simulations to establish the appropriate material characteristics including fracture properties Additionally, these tests served to identify the appropriate density range for roof-crush strength improvement Subsequently, nonlinear finite element analyses were performed to simulate the roof crush test per FMVSS 216 (Federal Motor Vehicle Safety Standards) at the A-pillar roof joint The study shows that the strength can be improved substantially by using rigid polyurethane foam By using foam, it is possible to reduce the pillar sections, reduce the thicknesses or eliminate reinforcements inside the pillars and thereby offset the mass increase due to the foam filling Also, a possible design concept utilizing the foam filling in a B-pillar that could meet the interior head impact requirements (per the FMVSS 201 Head Impact Protection upgrade) is presented


    Zugriff

    Zugriff prüfen

    Verfügbarkeit in meiner Bibliothek prüfen

    Bestellung bei Subito €


    Exportieren, teilen und zitieren



    Titel :

    Roof-Crush Strength Improvement Using Rigid Polyurethane Foam


    Weitere Titelangaben:

    Sae Technical Papers


    Beteiligte:
    Mani, A. (Autor:in) / Lilley, Kurt (Autor:in)

    Kongress:

    International Congress & Exposition ; 1996



    Erscheinungsdatum :

    01.02.1996




    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Print


    Sprache :

    Englisch




    Roof-crush strength improvement using rigid polyurethane foam

    Lilley,K. / Mani,K. / Foamseal Urethane Technology,US et al. | Kraftfahrwesen | 1996


    Roof-crush strength improvement using rigid polyurethane foam

    Lilley, K. / Mani, A. | Tema Archiv | 1998


    Automotive Roof Crush, Structural Foam Enhancement Solution

    Mansour, Mirdamadi / Pathare, Rahul | SAE Technical Papers | 2009


    Automotive roof crush, structural foam enhancement solution

    Pathare,R. / Mansour,M. / Delphi Automotive,US | Kraftfahrwesen | 2009


    Rigid polyurethane foam

    SHI LING / LU HUA / LI JUN | Europäisches Patentamt | 2021

    Freier Zugriff