DESIRABLE AND STRUCTURAL FEATURES FOR THE DESIGN OF FRONT AND REAR UNDERRUN BUMPERS FOR HEAVY GOODS VEHICLES

This paper starts with a review of accident situations requiring underrun bumpers. It then considers the effects of car masses and structural strengths on the design of bumpers. Design features discussed include: height above ground, strength to withstand full, partial offset and angled impacts, travel and force/deflection characteristics of energy absorbing bumpers and soft bumper faces to reduce pedestrian injuries. A joint programme between TRRL and Ti Tube Products Ltd is described for the design and development of an underrun bumper using the plastic deformation of mild steel tubes to absorb energy, and details of nine car to truck front impact tests are given. The final design is able to protect seat-belted car occupants from intrusion from a frontal collision at a closing speed of 65 kph, for a total bumper weight of approximately 60 kg and an estimated retail cost of L150 + VAT. Since these figures are only slightly greater than for a rigid underrun bumper of adequate strength, it is recommended that any future legislation for front underrun guards should require an energy absorption capability, and an outline of a possible legislative test procedure is given. For the covering abstract of the conference see TRIS 391971. (TRRL)

Media Info

  • Features: Figures; Photos; References;
  • Pagination: p. 139-145

Subject/Index Terms

Filing Info

  • Accession Number: 00391991
  • Record Type: Publication
  • Source Agency: Transport Research Laboratory
  • ISBN: 0-85298-539-8
  • Files: ITRD, TRIS
  • Created Date: Apr 29 1985 12:00AM