Structure realization method for collapse threshold of plastic deformation in train collision condition |
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Authors: | TIAN Hong-qi GAO Guang-jun YAO Song XU Ping LIU Hui |
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Affiliation: | TIAN Hong-qi1,2,GAO Guang-jun1,YAO Song1,XU Ping1,LIU Hui1,2 1.Key Laboratory of Traffic Safety on Track of Ministry of Education,Central South University,Changsha 410075,China,2.School of Traffic & Transportation Engineering |
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Abstract: | To protect passengers, absorb enough kinetic energy and meet the special requirements for trains which are different from
the other means of transportation, a method is presented to realize the plastic deformation threshold based on three main
aspects of train connection structure, crashworthy vehicle structure, energy-absorbing component. In practical engineering,
trains need enough strength and stiffness to transfer longitudinal force under the normal operation condition, and have to
produce controllable large plastic deformation to absorb energy shortly under the collision condition. To realize the structural
damage threshold of connecting structure in terminal end, two control methods are also proposed which can be divided as the
parametric method based on ‘extrusion’ and ‘cutting’ theories; the method which can cut the connecting components between
coupler-buffer devices and train bodies and separate them away when the damage thresholds of coupler-buffer devices are more
than the pre-supposed damage thresholds. The damage thresholds can be realized based on changing the parameters of the number
of shearing bolts, material parameters, etc. To realize the collision threshold of energy-absorbing components of trains,
a control method is presented based on the ways of setting plastic deformation induced structure, local hole and pre-deformation
structure. To realize the threshold of the controllable plastic structure of energy-absorbing vehicles, a control method is
proposed for the multi-level longitudinal stiffness of train terminal structures. |
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Keywords: | damage threshold train crashworthiness plastic deformation energy-absorbing structure |
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