Layered materials and structures for enhanced impact absorption
A garment worn by a wearer has an exterior shell and an interior shell with various impact absorbing material between the exterior shell and the interior shell. The impact absorbing material includes multiple structures, such as rods or filaments, capable of deforming when force is applied then returning to its state prior to application of the force. In various embodiments, a rate sensitive material (RSM) is positioned in one or more locations relative to the exterior shell and the interior shell of the garment to further attenuate impacts to the garment. The RSM changes its resistance to force based on a rate at which the material is loaded.
1. A helmet comprising:
an outer shell; and
a plurality of impact absorbing structures positioned inside the outer shell, the plurality of impact absorbing structures having a body including a rate-sensitive element, the rate-sensitive element configured to provide a rate sensitive response that resists an impact force at an inversely related rate to which the impact force is applied to the helmet.
2. The helmet of claim 1 , wherein the outer shell is flexible.
3. The helmet of claim 1 , wherein the helmet further comprises an inner shell.
4. The helmet of claim 1 , wherein the outer shell comprises a rate-sensitive material (RSM).
5. The helmet of claim 1 , wherein the helmet further comprises a rate-sensitive material layer, the rate sensitive material layer positioned adjacent to at least one end of the plurality of impact absorbing structures.
6. The helmet of claim 5 , wherein the rate sensitive material layer comprises foam.
7. The helmet of claim 1 , wherein the body including a rate sensitive element comprises a fluid-filled or gel-filled module.
8. The helmet of claim 1 , wherein the body including rate sensitive element comprises a first curved beam and a second curved beam.
9. The helmet of claim 1 , wherein the body including a rate sensitive element comprises a frustum shaped body.
10. A helmet comprising:
an outer shell;
an inner shell,
a plurality of impact absorbing structures having an end inside the outer shell and proximate to the outer shell at one end and an opposite end outside the inner shell and proximate to the inner shell, the plurality of impact absorbing structures having a rate sensitive means.
11. The helmet of claim 9 , wherein the impact absorbing structure includes the rate sensitive material.
12. The helmet of claim 9 , wherein the outer shell is flexible.
13. The helmet of claim 9 , wherein the inner shell is rigid.
14. The helmet of claim 9 , wherein the outer shell comprises a rate sensitive material.
15. The helmet of claim 9 , wherein the helmet further comprises a rate sensitive material layer, the rate sensitive material layer positioned adjacent to at least one end of the plurality of impact absorbing structures.
16. The helmet of claim 15 , wherein the rate sensitive material layer comprises a foam.