Energy absorbing articles

Abstract

An article includes a plurality of expansive structures and the dimension of the expansive structure is more than about 1mm. The article also includes a plurality of unit borders, at least one for each expansive structure. The unit border is provided so as to resist the deformation of the expansive structure. A vehicle energy-absorbing device includes a plurality of expansive structures and the dimension of the expansive structure is larger than about 1mm.

Description

technical field [0001] The present invention relates generally to energy absorbing systems and, more particularly, to energy absorbing systems and articles having an auxetic structure. Background technique [0002] Energy absorption systems are widely used in applications where additional energy needs to be controlled without causing damage to surrounding objects. For example, in the automotive industry, such systems are also known as energy absorbers (EA) and are used in bumper systems of automobiles and the like. Typically, bumpers are designed to absorb most of the impact in the event of a collision with other objects, including vehicles, stationary objects or pedestrians, to minimize injuries to passengers and pedestrians. Traditionally, energy absorbers have been fabricated using expanded foam or thermoplastic materials attached to metal beams. Energy absorbers used in bumpers are required to provide an enhanced safety level of energy absorption for collisions at impa...

AI Technical Summary

Problems solved by technology

Moreover, compliance with industry regulations, such as the need to provide sufficient deformation under low-speed collisions to minimize possible injuries to pedestrians, and to provide high obstacle forces under high-speed impacts, poses a major challenge to traditional metal or plastic bumpers.

Furthermore, modern energy absorbing systems must cope with complex situations such as multiple impact collisions in which the second impact occurs on a deformed front bumper

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