A honeycomb structure having high levels of recoverable energy absorption is provided. The honeycomb structure achieves high levels of recoverable energy absorption by incorporating cells that exhibit negative stiffness. In one embodiment, the cells exhibit negative stiffness via curved beam members
A honeycomb structure having high levels of recoverable energy absorption is provided. The honeycomb structure achieves high levels of recoverable energy absorption by incorporating cells that exhibit negative stiffness. In one embodiment, the cells exhibit negative stiffness via curved beam members configured to snap through to a second position upon experiencing a sufficient force. The cells may also be configured to snap back to their original position when the force is removed. Therefore, the honeycomb structure may be capable of repeatedly achieving a high level of recoverable energy absorption.
대표청구항▼
1. An energy absorbing cellular structure, comprising: a plurality of cells,wherein at least one of said plurality of cells comprises: a first sidewall;a second sidewall spaced apart and opposite the first sidewall;a first cell wall extending between and coupled to the first and second sidewalls;a s
1. An energy absorbing cellular structure, comprising: a plurality of cells,wherein at least one of said plurality of cells comprises: a first sidewall;a second sidewall spaced apart and opposite the first sidewall;a first cell wall extending between and coupled to the first and second sidewalls;a second cell wall spaced apart and opposite the first cell wall, the second cell wall extending between and coupled to the first and second sidewalls;a first reinforcing cell wall extending between and coupled to the first and second sidewalls, the first reinforcing cell wall being parallel and spaced apart from the first cell wall;a second reinforcing cell wall extending between and coupled to the first and second sidewalls, the second reinforcing cell wall being parallel and spaced apart from the second cell wall;a lateral constraint beam extending between and coupled to the first and second sidewalls and being disposed between and spaced apart from the first and second cell walls, the lateral constraint beam preventing lateral movement of the first and second sidewalls relative to each other; anda spacer disposed at a mid-point of the lateral constraint beam and extending from the lateral constraint beam in a direction toward the first and second cell walls, the spacer having distal ends adjacent and spaced apart from the first and second cell walls, wherein the spacer prevents the first cell wall, the second cell wall, the first reinforcing cell wall, and the second reinforcing cell wall from deflecting beyond a predetermined amount;wherein: the first cell wall is disposed between and spaced apart from the first reinforcing cell wall and the lateral constraint beam,the second cell wall is disposed between and spaced apart from the second reinforcing cell wall and the lateral constraint beam,the first cell wall, the first reinforcing cell wall, the second cell wall, and the second reinforcing cell wall each comprise a curved beam that has only one stable orientation that deflects under a load and returns to an original state of the curved beam after the load is removed, andeach of the curved beams of the first cell wall, the first reinforcing cell wall, the second cell wall, and the second reinforcing cell wall exhibits a negative stiffness load profile when the load is applied to the cellular structure. 2. The cellular structure of claim 1, wherein the plurality of cells are periodically repeating. 3. A method of elastically absorbing energy, comprising: providing a cellular mesostructure, the cellular mesostructure having a plurality of cells, each cell comprising: a first sidewall;a second sidewall spaced apart and opposite the first sidewall;a first cell wall extending between and coupled to the first and second sidewalls;a second cell wall spaced apart and opposite the first cell wall, the second cell wall extending between and coupled to the first and second sidewalls;a first reinforcing cell wall extending between and coupled to the first and second sidewalls, the first reinforcing cell wall being parallel and spaced apart from the first cell wall;a second reinforcing cell wall extending between and coupled to the first and second sidewalls, the second reinforcing cell wall being parallel and spaced apart from the second cell wall;a lateral constraint beam extending between and coupled to the first and second sidewalls and being disposed between and spaced apart from the first and second cell walls, the lateral constraint beam preventing lateral movement of the first and second sidewalls relative to each other; anda spacer disposed at a mid-point of the lateral constraint beam and extending from the lateral constraint beam in a direction toward the first and second cell walls, the spacer having distal ends adjacent and spaced apart from the first and second cell walls, wherein the spacer prevents the first cell wall, the second cell wall, the first reinforcing cell wall, and the second reinforcing cell wall from deflecting beyond a predetermined amount;wherein: the first cell wall is disposed between and spaced apart from the first reinforcing cell wall and the lateral constraint beam,the second cell wall is disposed between and spaced apart from the second reinforcing cell wall and the lateral constraint beam,the first cell wall, the first reinforcing cell wall, the second cell wall, and the second reinforcing cell wall each comprise a curved beam that has only one stable orientation that deflects under a load and returns to an original state of the curved beam after the load is removed, andeach of the curved beams of the first cell wall, the first reinforcing cell wall, the second cell wall, and the second reinforcing cell wall exhibits a negative stiffness load profile when the load is applied to the cellular structure; andapplying the load with a predetermined amount of force, the predetermined amount of force causing the curved beams of the first cell wall, the first reinforcing cell wall, the second cell wall, and the second reinforcing cell wall to deflect,wherein the curved beams of the first cell wall, the first reinforcing cell wall, the second cell wall, and the second reinforcing cell wall recover their original configuration upon removal of the predetermined amount of force. 4. The method of claim 3, further comprising placing the cellular mesostructure within an impact absorbing device. 5. The method of claim 4, wherein the impact absorbing device is a component of a motor vehicle. 6. The method of claim 4, wherein the impact absorbing device is a personal protection apparatus. 7. The method of claim 4, wherein the impact absorbing device is an apparatus for use in sports. 8. The cellular structure of claim 1, wherein the lateral constraint beam comprises a first lateral constraint beam support and a second lateral constraint beam support, wherein the first lateral constraint beam support extends between the lateral constraint beam and the first sidewall, and the second lateral constraint beam support extends between the lateral constraint beam and the second sidewall, the first and second lateral constraint beam supports strengthening a bond between the lateral support beam and the sidewalls during loading events in both normal and non-normal directions. 9. The method of claim 3, wherein the lateral constraint beam comprises a first lateral constraint beam support and a second lateral constraint beam support, wherein the first lateral constraint beam support extends between the lateral constraint beam and the first sidewall, and the second lateral constraint beam support extends between the lateral constraint beam and the second sidewall, the first and second lateral constraint beam supports strengthening a bond between the lateral support beam and the sidewalls during loading events in both normal and non-normal directions.
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이 특허에 인용된 특허 (3)
Callaway Milton C. A. (Dahlonega GA), Bedding system including spring having limiting membrane.
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