Short-beam negative stiffness elements

摘要

A deformable component which is initially flat and which can be caused to buckle by the application of a radially inward preload force, applied using an outer clamp. The deformable component in the buckled configuration then exhibits negative stiffness over a portion of its range of travel, when an axial force is applied. The deformable component may be fabricated from metal sheet, and may take the form of a polygonal central portion and at least two arms extending radially outwards.

主权项

1. A negative stiffness element, comprising:
a plurality of deformable components arranged in a stack, each of the plurality of deformable components comprising:
a polygonal central portion having a central through hole; anda plurality of arms extending radially outward from the central portion,
the arms having substantially identical length with each other,each of the arms having a ratio of length to thickness greater than 10 and less than 30,the polygonal central portion and the plurality of arms having a substantially identical uniform thickness, andthe polygonal central portion and the plurality of arms being composed of an identical high elasticity material; and an outer clamp, each of the arms of each of the plurality of deformable components being compressively preloaded radially inward by the outer clamp.