Flexural sheet explosive simulants

Patent metadata

Field	Value
Publication number	US-11613504-B2
Application number	US-202217583983-A
Country	US
Kind code	B2
Filing date	Jan 25, 2022
Priority date	May 25, 2017
Publication date	Mar 28, 2023
Grant date	Mar 28, 2023

Abstract

An explosive sheet simulant that uses an ethylene vinyl acetate polymer combined with boron carbide or iron oxide for X-ray attenuating properties, and components of the mixture selected for predetermined flexural modulus combined with particle density, effective atomic number, X-ray transmission properties, or millimeter wave properties.

First claim

What is claimed is:

1. An explosive simulant, consisting of a mixture of:
ethylene vinyl acetate (EVA) polymer comprising a naphthenic plasticizer wherein a composition of the EVA polymer with the naphthenic plasticizer is cross linked; and
at least one compound selected from the group consisting of boron carbide and iron oxide;
wherein the explosive simulant has a density (g/cc) of 1.50, an effective atomic number (Z effective) of 7.76, a high reveal computed tomography number (High Reveal-CT #) of 13403 Modified Hounsfield Units, and a low reveal computed tomography number (Low Reveal-CT #) of 13390 Modified Hounsfield Units;
wherein the explosive simulant is in a form of a sheet having a flexural modulus property of an explosive and millimeter wave properties of the explosive; and
wherein the explosive simulant consists of 25.0-58.0% EVA polymer, 49.0-71.0% boron carbide and 0.7-2.5% iron oxide.

2. The explosive simulant according to claim 1 , consisting of a mixture of EVA polymer, boron carbide and iron oxide.

3. The explosive simulant according to claim 1 , further comprising:
the sheet having a flexural modulus of 0.493 approximately equal to flexural modulus of pentaerythritol tetranitrate (PETN) sheet explosive which can be 0.216 or 0.307, and
X-ray transmission approximately equal to X-ray transmission of PETN sheet explosive, or millimeter wave properties approximately equal to millimeter wave properties of PETN sheet explosive, or both.

4. The explosive simulant according to claim 1 , further comprising:
the sheet having a flexural modulus approximately equal to flexural modulus of cyclotrimethylenetrinitramine (RDX) sheet explosive, and
X-ray transmission approximately equal to X-ray transmission of RDX sheet explosive, or millimeter wave properties approximately equal to millimeter wave properties of RDX sheet explosive, or both.

5. The explosive simulant according to claim 1 , further comprising having the effective atomic number of 7.76 to simulate that of pentaerythritol tetranitrate (PETN) sheet explosive which is 7.81.

6. The explosive simulant according to claim 1 , further comprising having a dielectric response property to simulate that of pentaerythritol tetranitrate (PETN) sheet explosive which is real ε′ of 2.82 and imaginary ε′ of 0.16.

7. The explosive simulant according to claim 1 , wherein the explosive simulant has the density of 1.50 to simulate that of pentaerythritol tetranitrate (PETN) sheet explosive which is 1.48.

8. The explosive simulant according to claim 1 , wherein the explosive simulant has the Z effective of 7.76 to match that of pentaerythritol tetranitrate (PETN) sheet explosive which is 7.81.

9. The explosive simulant according to claim 1 , wherein the explosive simulant has a dielectric constant property to simulate that of pentaerythritol tetranitrate (PETN) sheet explosive which is real ε′ of 2.82 and imaginary ε′ of 0.16.

10. The explosive simulant according to claim 1 , wherein the explosive simulant has a flexural modulus property compatible with an ability to conform to a human body in a manner of pentaerythritol tetranitrate (PETN) sheet explosive.

Assignees

• The Government Of The Us Secretary Of Homeland Security

Inventors

• Brogden Michael
• Duffy Steve

Classifications

• C08K2003/2244

  of zirconium · CPC title

• C08K2003/2265

  of iron · CPC title

• C08K3/38 Primary

  Boron-containing compounds · CPC title

• C08K2003/265

  Calcium, strontium or barium carbonate · CPC title

• C06B23/001 Primary

  Fillers, gelling and thickening agents (e.g. fibres) , absorbents for nitroglycerine (binders, plasticisers for propellants C06B45/10; crosslinking or curing agents C06B45/10) · CPC title