# US 10,871,355 B2 · Metal cellular structures for composite structures reinforcement

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- Number: US 10,871,355 B2
- Document ID: US10871355B2
- Status: Granted
- Kind: B2
- Application number: 16/819,237
- Filed: 2020-03-16
- Published: 2020-10-01
- Granted: 2020-12-22
- Earliest claimed: 2019-04-01
- Applicants: US Govt as represented by Secretary of Air Force
- Inventors: Philip J. Flater, IV; Charles M. Jenkins
- Web page: https://patentgrep.com/patent/US10871355B2

## CPC

- F42B 12/207: {characterised by the explosive material or the construction of the high explosive warhead, e.g. insensitive ammunition}
- F42B 12/208: {characterised by a plurality of charges within a single high explosive warhead}
- F42B: EXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION (explosive compositions C06B; fuzes F42C; blasting F42D)

## Abstract

A munition includes a triply periodic minimal surface (TPMS) structure attached to an inner surface of a cylindrical tube. The TPMS structure is formed by an additive manufacturing process to promote fluid permeability and to reduce pressure drop to prevent trapped air and maximize surface area contact at a structure and liquid interface. An explosive material is introduced into one or more upper apertures of the TPMS in a flowable state to fill the TPMS structure n a compartmentalized arrangement that provides stiffness to the munition.

## Claims

### Claim 1

A munition comprising:
a cylindrical tube;
a triply periodic minimal surface (TPMS) structure attached to an inner surface of the cylindrical tube and formed by an additive manufacturing process to promote fluid permeability and to reduce pressure drop to prevent trapped air and maximize surface area contact at a structure and liquid interface; and
an explosive material that is introduced into one or more upper apertures of the TPMS in a flowable state to fill the TPMS structure in a compartmentalized arrangement that provides stiffness to the munition.

### Claim 2 (depends on 1)

The munition of claim 1, wherein the TPMS structure has more than one flow path between respective upper and lower apertures, at least one flow path filled with a first material and at least one other flow path filled with a second material that combine to produce the explosive material.

### Claim 3 (depends on 1)

The munition of claim 1, wherein the TPMS structure comprises a selected one of: (i) Schwarz primitive; (ii) a Schoen gyroid; and (iii) a Schwarz diamond.

### Claim 4 (depends on 1)

The munition of claim 1, wherein the cylindrical tube comprises a carbon fiber composite that receives structural support to resist compression, twisting and bending from the TPMS structure.