Federal regulations DOT 406, 407, and 412 require that cargo tank motor vehicles used on U.S. highways be equipped with rollover-protection devices to protect manhole covers, valves, vents, and other top-mounted hardware from damage and to prevent leakage of product during rollover accidents. In its 1992 Special Investigation Report entitled 'Cargo Tank Rollover Protection,' the National Transportation Safety Board was critical of existing rollover-protection devices and found that 'insufficient guidance...(exists) about the factors and assumptions that a cargo tank manufacturer must consider when calculating loads on the rollover-protection devices...' and that 'there is inadequate information about the forces that can be encountered in a rollover accident and the extent to which rollover-protection devices for cargo tanks can reasonably be designed to withstand these forces.' This study has attempted to expand the knowledge base on the dynamics of tank vehicle rollover events in order that such guidance and information can be improved. The primary contribution of this study is a broad-ranging examination of the dynamics of tank-vehicle rollover accomplished through computer simulation. Seven cargo tank motor vehicles, two tank trucks, and five tractor semitrailer combinations were simulated. Each was subjected to 126 simulated maneuvers intended to result in rollover. Test maneuvers included mild, low-speed turns that just barely produced rollover, more dynamic maneuvers on smooth surfaces, and high-speed impacts with curbs and guardrails that result in rapid rollover combined with substantial pitch and yaw.


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    Title :

    Dynamics of Tank-Vehicle Rollover and the Implications for Rollover-Protection Devices. Final Report


    Publication date :

    1998


    Size :

    72 pages


    Type of media :

    Report


    Type of material :

    No indication


    Language :

    English





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