Compact, lightweight and reusable local energy absorbers
An energy absorbing structure includes a base, a loading platform, a pair of side supports, a center support, and a pair of flexible segments. The loading platform is spaced apart from the base. The side supports project from the base toward the loading platform. The center support projects from the loading platform toward the base. The flexible segments extend from the side supports to the center support and connect the side supports to the center support. The flexible segments have straight edges and curved surfaces disposed between the straight edges. The straight edges extend from the side supports to the center support and are oriented at an oblique angle relative to the base. Each of the curved surfaces faces one of the base and the loading platform.
1. An energy absorbing structure comprising:
a base;
a loading platform spaced apart from the base;
a pair of side supports projecting from the base toward the loading platform, wherein the base and the side supports are integrally formed as a single piece;
a center support projecting from the loading platform toward the base, wherein the loading platform and the center support are integrally formed as a single piece; and
a pair of flexible segments extending from the side supports to the center support and connecting the side supports to the center support, the flexible segments having straight edges and curved surfaces disposed between the straight edges, wherein:
the straight edges extend from the side supports to the center support and are oriented at an oblique angle relative to the base;
each of the curved surfaces faces one of the base and the loading platform; and
the flexible segments are formed separate from the base, the side supports, the loading platform, and the center support.
2. The energy absorbing structure of claim 1 wherein:
the base, the side supports, the loading platform, and the center support are formed from a first material; and
the flexible segments are formed from a second material that is different than the first material.
3. The energy absorbing structure of claim 2 wherein the second material is has a greater elastic limit than the first material.
4. The energy absorbing structure of claim 2 wherein the first material is a polymer material and the second material is a metal.
5. The energy absorbing structure of claim 1 wherein the oblique angle at which the flexible segments are oriented relative to the base is an angle between 5 degrees and 95 degrees.
6. The energy absorbing structure of claim 1 wherein each of the flexible segments has a length that extends from one of the side supports to the center support, and the length is a multiple of a product of a radius of curvature of the curved surfaces and an angle by which the curved surfaces extend around their respective loci.
7. The energy absorbing structure of claim 1 wherein when a load is applied to the loading platform in a direction that urges the loading platform toward the base, the flexible segments are configured to elastically deform while absorbing energy.
8. The energy absorbing structure of claim 7 wherein when the loading platform moves closer to the base as the flexible segments elastically deform in response to the load, the flexible segments counteract the bad with a biasing force that urges the loading platform to return to its original position.
9. The energy absorbing structure of claim 1 wherein each of the side supports includes a vertical wall and an angled wall, the vertical wall being oriented at a right angle relative to the base, the angled wall being oriented at the same oblique angle relative to the base at which the flexible segments are oriented relative to the base.
10. The energy absorbing structure of claim 9 wherein the center support includes a vertical wall and a pair of angled walls, the vertical wall of the center support being oriented at a right angle relative to the loading platform, each of the angled walls of the center support being oriented at the same oblique angle relative to the loading platform at which the flexible segments are oriented relative to the base.
11. The energy absorbing structure of claim 10 wherein each of the angled walls of the side supports define curved slots that receive first ends of the flexible segments, and each of the angled walls of the center support define curved slots that receive second ends of the flexible segments opposite of the first ends.
12. The energy absorbing structure of claim 1 wherein the curved surfaces of each of the flexible segments include a convex surface that faces the base and a concave surface that faces the loading platform.
13. An energy absorbing system including multiple ones of the energy absorbing structure of claim 1 arranged adjacent to one another in a side-by-side manner such that an outside surface of at least one of the side supports of one of the energy absorbing structures faces an outside surface of one of the side supports of another one of the energy absorbing structures.
14. A hood impact mitigation assembly comprising:
a vehicle hood having a top surface and an underside surface;
a vehicle component disposed underneath the vehicle hood, the vehicle component having a top surface facing the underside surface of the vehicle hood; and
an energy absorbing structure disposed between the vehicle hood and the vehicle component and attached to one of the underside surface of the vehicle hood and the top surface of the vehicle component, the energy absorbing structure including:
a base;
a loading platform spaced apart from the base;
a pair of side supports projecting from the base toward the loading platform, wherein the base and the side supports are integrally formed as a single piece;
a center support projecting from the loading platform toward the base, wherein the loading platform and the center support are integrally formed as a single piece; and
a pair of flexible segments extending from the side supports to the center support and connecting the side supports to the center support, the flexible segments having straight edges and curved surfaces disposed between the straight edges, wherein:
the straight edges extend from the side supports to the center support and are oriented at an oblique angle relative to the base;
each of the curved surfaces faces one of the base and the loading platform; and
the flexible segments are formed separate from the base, the side supports, the loading platform, and the center support.
15. The hood impact mitigation assembly of claim 14 wherein the energy absorbing structure is attached to the underside surface of the vehicle hood.
16. The hood impact mitigation assembly of claim 14 wherein:
the base and the side supports are formed from a polymer material;
the loading platform and the center support are formed from the polymer material; and
the flexible segments are formed from a metal.
17. The energy absorbing structure of claim 14 wherein when a load is applied to the loading platform in a direction that urges the loading platform toward the base, the flexible segments are configured to elastically deform while absorbing energy.
18. The energy absorbing structure of claim 17 wherein when the loading platform moves closer to the base as the flexible segments elastically deform in response to the bad, the flexible segments counteract the bad with a biasing force that urges the loading platform to return to its original position.
19. The energy absorbing structure of claim 14 wherein the curved surfaces of each of the flexible segments include a convex surface that faces the base and a concave surface that faces the loading platform.
20. The energy absorbing structure of claim 14 wherein each of the flexible segments has a length that extends from one of the side supports to the center support, and the length is a multiple of a product of a radius of curvature of the curved surfaces and an angle by which the curved surfaces extend around their respective loci.