Connect public, paid and private patent data with Google Patents Public Datasets

Method for mitigating blast and shock transmission within a confined volume

Download PDF

Info

Publication number
US3804017A
US3804017A US23976272A US3804017A US 3804017 A US3804017 A US 3804017A US 23976272 A US23976272 A US 23976272A US 3804017 A US3804017 A US 3804017A
Authority
US
Grant status
Grant
Patent type
Prior art keywords
vessel
explosive
volume
pressure
vermiculite
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
Inventor
D Venable
R Taylor
B Rogers
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
US Atomic Energy Commission (AEC)
Original Assignee
US Atomic Energy Commission (AEC)
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Grant date

Links

Images

Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F42AMMUNITION; BLASTING
    • F42DBLASTING
    • F42D5/00Safety arrangements
    • F42D5/04Rendering explosive charges harmless, e.g. destroying ammunition; Rendering detonation of explosive charges harmless
    • F42D5/045Detonation-wave absorbing or damping means
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F42AMMUNITION; BLASTING
    • F42DBLASTING
    • F42D5/00Safety arrangements
    • F42D5/04Rendering explosive charges harmless, e.g. destroying ammunition; Rendering detonation of explosive charges harmless
    • F42D5/055Silencing means for blasting operations

Abstract

The blast and shock wave emanating from an explosive event within a confined volume is substantially reduced when the volume is filled with a low-density, particulate, energy absorbing medium having poor shock transmission characteristics such as vermiculite or expanded (''''popped'''') perlite. If a vacuum can be drawn in the volume containing the particulate medium, even greater shock and blast mitigation is achieved.

Description

United States Patent Venable et al.

METHOD FOR MITIGATING BLAST AND SHOCK TRANSMISSION WITHIN A CONFINED VOLUME Inventors: Douglas Venable, Los Alamos; Roger W. Taylor; Benjamin T. Rogers, both of Embudo, all of N. Mex.

The United States of America as represented by the United States Atomic Energy Commission, Washington, DC.

Filed: Mar. 30, 1972 Appl. No.: 239,762

Assignee:

US. Cl. 102/23 rm. Cl. F42d 5/00 Field of Search 102/22-24, 102/89, 36 A References Cited UNITED STATES PATENTS 7/1957 Ryan 102/24 HC [111 3,804,017 Apr. 16, 1 974 2,984,307 5/1961 Barnes 102/24 HC 1,237,883 8/1917 Elia 89/36 A OTHER PUBLICATIONS Nature, Attenuating Blast Waves Produced by an Instantaneous Release of Thermal Energy, Wadsworth, p. 673 relied on, Nov. 14, 1964.

Primary Examiner-Verlin R. Pendegrass Attorney, Agent, or Firm-John A. Horan; Edward C.

Walterscheid [5 7] ABSTRACT 2 Claims, No Drawings METHOD FOR MITIGATING BLAST AND SHOCK TRANSMISSION WITHIN A CONFINED VOLUME CROSS REFERENCE TO RELATED APPLICATION Ser. No. 252,171 entitled Confinement System for High Explosive Events by Benjamin T. Rogers, Roger W. Taylor, and Douglas Venable filed May 11, 1972.

BACKGROUND OF THE INVENTION The invention disclosed herein was made in the course of, or under, a contract with the US. ATOMIC ENERGY COMMISSION. It relates to a method of mitigating the blast and shock transmission from an explosive event within a confined volume.

In the course of research directed at the high pressure hydrodynamic properties of materials, it is necessary to resort to explosive driven systems to attain the required pressures. From time to time it may also be necessary to examine toxic, noxious, or radioactive materials to complete the study of a given class of materials. Increasingly, considerations of safety, environmental protection, and long term economics preclude experimental procedures that would allow such materials to be dispersed into the air, onto the earth, or into water.

Apart from the concurrently filed application entitled Confinement System for High Explosive Events by the same inventors, the art discloses no system for completely containing both the energy and the products of an explosive event within a reasonably small volume when the size of the explosive charge detonated exceeds about one pound. The concurrently filed application, however, reveals that the energy and products of the detonation of an explosive charge weighing in excess of 30 pounds can be completely contained in a 6 ft diameter spherical confinement vessel having a 1 inch thick mild steel wall and in which a vacuum of about 500 microns has been drawn.

In US. Pat. No. 3,268,107, issued Aug. 23, 1966, Sperling discloses a vented container in which small quantities of powerful explosive compositions may be detonated with the container substantially absorbing the energy of the detonation. An important feature of the container is an inner liner which is preferably a light-weight energy absorbent barrier of fairly high mechanical strength but of material particularly suitable for absorbing a large portion of the explosive force. The liner may be frangible or it may be made of some material exhibiting resilience. A limitation on the use of energy absorbing liners is that they must be so configured when manufactured as to enable them to be inserted into the containment vessel.

In US. Pat. No. 3,165,916, issued Jan. 19, 1965, Loving indicates that the load limit for a confinement vessel having explosive charges detonated therein may be increased by the presence of a substantial mass of loose granular material within the vessel. According to the invention, the granular material may occupy a segment of the vessel having a height about one twentyfourth to one-half the height of the vessel. Sand is the preferred material, but any loose granular material having a bulk density of 40-280 lb/ft may be used.

SUMMARY OF THE INVENTION We have now found that the total explosive loading capacity of a confinement, vessel may be substantially limited to these two materials. The manner in which the low-density particulate material is loaded into the vessel or other enclosure is not critical insolongas the ma terial encompasses the explosive event and substantially fills the vessel or enclosure.

The method of this invention is particularly suitable for use with confinement vessels of the type disclosed in the concurrently filed application. The vessel may be either at atmospheric pressure or have a partial vacuum drawn in it. For example, the detonation of an 8 lb charge of composition G4 in a 6 ft diameter spherical confinemefi vessel filled with vermiculite and at atnio spheric pressure results in a pressure rise at the wall of the vessel a factor of about 15 less than if the charge had been detonated in the same vessel with nofiller added. With the use of a filler material such as vermiculite, it is difficult to draw a substantial vacuum within a confinement vessel within a reasonable time due to outgassing from the filler material. However, with a partial vacuum, i.e., a pressure of several thousand microns, which can be readily achieved, the pressure rise from the detonation of the same charge is a factor of about 27 less than that produced in the same type of. vessel with no filling and at atmospheric pressure.

Our method is also quite useful in mitigating the blast and shock transmission from an explosive event in any confined volume. That is to say, it is not limited to use with vessels intended to completely contain the energy and other products of an explosive event, but may be used wherever there is some confiningvolume available for encompassing the event with a suitable filler material.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Two 1 lb charges of the high explosive composition 04 were detonated in 3 ft diameter spherical confinementTessHs Bftli' type discfoseddn'the'concurrently filed application. Both vessels were at atmospheric pressure, but one was filled with vermiculite and the other-which acted as a control-had no filler material in it. The control vessel registered at its walls a sharp rise to a peak pressure of 750 psi whereas the filled vessel showed only a slow rise to a peak of 50 psi. A similar pair of shots were fired in 6 ft diameter vessels with 8 1b charges of composition C-4. On a volume basis, 8 pounds of explosive in a 6 ft diameter vessel scales with a 1 lb shot in a 3 ft diameter vessel. In the 6 ft diameter vessels the control gave a sharp rise to 800 psi and the filled shot gave a slow rise to 45 psi. These data indicate that the blast mitigation effect of vermiculite scales to larger confinements. In the 6 ft diameter vessel the detonation of an 8 lb charge of composition C-4 at atmospheric pressure with the vessel filled with vermiculite showed a pressure rise at the wall of the vessel that was a factor of 15 less than that of an 8 lb charge fired in the same vessel at atmospheric pressure with no fillmg.

Similar shots were then fired in vessels containing vermiculite and also partially evacuated. Because of the large surface area of the vermiculite, it was not feasible to pump down the vessels to pressures of 500 microns or less in any reasonable time. However, firing the charges at a pressure of several thousand microns in a vermiculite filled vessel produced a pressure rise at the wall of the vessel which was a factor of 27 less than that produced by the same charge fired in the same type of vessel at atmospheric pressure with no filling.

Sandia Corporation performed the following experiment in a magazine about 40 feet long by feet wide. having 8 foot high walls and a curved ceiling with a maximum height of 15 feet. Three lb high explosive charges were placed at 8 foot intervals in the magazine. beginning 8 feet from the rear of the magazine. The magazine was then filled with sacks of vermiculite and 4 the three charges detonated serially. There was no evidence of blast damage on the walls or ceiling of the magazine and the bags of vermiculite at the entrance remained undisturbed.

What we claim is:

l. A method of mitigating blast and shock transmission from an explosive event within a confined volume which comprises substantially filling said volume and encompassing said event with a low-density, particulate. energy absorbing medium and drawing a partial vacuum within said volume.

2. The method of claim 1 wherein said medium is vermiculite.

Claims (2)

1. A method of mitigating blast and shock transmission from an explosive event within a confined volume which comprises substantially filling said volume and encompassing said event with a low-density, particulate, energy absorbing medium and drawing a partial vacuum within said volume.
2. The method of claim 1 wherein said medium is vermiculite.
US3804017A 1972-03-30 1972-03-30 Method for mitigating blast and shock transmission within a confined volume Expired - Lifetime US3804017A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US3804017A US3804017A (en) 1972-03-30 1972-03-30 Method for mitigating blast and shock transmission within a confined volume

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US3804017A US3804017A (en) 1972-03-30 1972-03-30 Method for mitigating blast and shock transmission within a confined volume

Publications (1)

Publication Number Publication Date
US3804017A true US3804017A (en) 1974-04-16

Family

ID=22903620

Family Applications (1)

Application Number Title Priority Date Filing Date
US3804017A Expired - Lifetime US3804017A (en) 1972-03-30 1972-03-30 Method for mitigating blast and shock transmission within a confined volume

Country Status (1)

Country Link
US (1) US3804017A (en)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0299902A2 (en) * 1987-07-16 1989-01-18 Koor Metals Ltd. Blast-resistant container
US5650588A (en) * 1995-10-10 1997-07-22 Nakajima; Yasuji Method for setting blasting employing bar-like charge
US20040118272A1 (en) * 2002-12-06 2004-06-24 The Boeing Company Blast attenuation device and method
US20080236378A1 (en) * 2007-03-30 2008-10-02 Intellectual Property Holdings, Llc Affixable armor tiles
US20090081928A1 (en) * 2005-04-08 2009-03-26 National Inst Of Adv Industrial Science And Tech. Blasting treating method
US20090114083A1 (en) * 2006-01-23 2009-05-07 Moore Iii Dan T Encapsulated ceramic composite armor
US20100282062A1 (en) * 2007-11-16 2010-11-11 Intellectual Property Holdings, Llc Armor protection against explosively-formed projectiles

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1237883A (en) * 1916-12-07 1917-08-21 Giovanni Emanuele Elia Ship protection against submarine explosions.
US2797892A (en) * 1949-12-12 1957-07-02 Phillips Petroleum Co Explosive apparatus
US2984307A (en) * 1957-09-27 1961-05-16 Schlumberger Well Surv Corp Cutting apparatus

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1237883A (en) * 1916-12-07 1917-08-21 Giovanni Emanuele Elia Ship protection against submarine explosions.
US2797892A (en) * 1949-12-12 1957-07-02 Phillips Petroleum Co Explosive apparatus
US2984307A (en) * 1957-09-27 1961-05-16 Schlumberger Well Surv Corp Cutting apparatus

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
Nature, Attenuating Blast Waves Produced by an Instantaneous Release of Thermal Energy, Wadsworth, p. 673 relied on, Nov. 14, 1964. *

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0299902A2 (en) * 1987-07-16 1989-01-18 Koor Metals Ltd. Blast-resistant container
EP0299902A3 (en) * 1987-07-16 1990-03-21 Koor Metals Ltd. Blast-resistant container
US5650588A (en) * 1995-10-10 1997-07-22 Nakajima; Yasuji Method for setting blasting employing bar-like charge
US20040118272A1 (en) * 2002-12-06 2004-06-24 The Boeing Company Blast attenuation device and method
US20040154463A1 (en) * 2002-12-06 2004-08-12 The Boeing Company Blast attenuation device and method
US6782792B1 (en) 2002-12-06 2004-08-31 The Boeing Company Blast attenuation device and method
US6805035B2 (en) 2002-12-06 2004-10-19 The Boeing Company Blast attenuation device and method
US6901839B2 (en) 2002-12-06 2005-06-07 The Boeing Company Blast attenuation device and method
US20090081928A1 (en) * 2005-04-08 2009-03-26 National Inst Of Adv Industrial Science And Tech. Blasting treating method
US8006600B2 (en) * 2005-04-08 2011-08-30 Kabushiki Kaisha Kobe Seiko Sho Multiple blasting treating method
US20090114083A1 (en) * 2006-01-23 2009-05-07 Moore Iii Dan T Encapsulated ceramic composite armor
US7866248B2 (en) 2006-01-23 2011-01-11 Intellectual Property Holdings, Llc Encapsulated ceramic composite armor
US20080236378A1 (en) * 2007-03-30 2008-10-02 Intellectual Property Holdings, Llc Affixable armor tiles
US20100282062A1 (en) * 2007-11-16 2010-11-11 Intellectual Property Holdings, Llc Armor protection against explosively-formed projectiles

Similar Documents

Publication Publication Date Title
US3476048A (en) Underwater ammunition
US3649426A (en) Flexible protective armour material and method of making same
Brode Review of nuclear weapons effects
US4366095A (en) Process and equipment for the transportation and storage of radioactive and/or other dangerous materials
Colgate Neutron-star formation, thermonuclear supernovae, and heavy-element reimplosion
US3254996A (en) Method of preparing a sintered incendiary bomblet
US4877131A (en) Firearm recovery bag
US4389947A (en) Blast suppressive shielding
US4132148A (en) Expellable reaction mass for recoilless projectile launchers
US4325309A (en) Blast suppressive shielding
US5613453A (en) Method and apparatus for containing and suppressing explosive detonations
US4248342A (en) Blast suppressive shielding
US20030209133A1 (en) Container for explosive device
US20030131722A1 (en) Method for suppressing ejection of fragments and shrapnel during destruction of shrapnel munitions
US6196107B1 (en) Explosive containment device
US3666616A (en) Vapor suppressing means for a nuclear reactor
JP2005291514A (en) Blasting treating method of chemical ammunition
US4372213A (en) Molten metal-liquid explosive method
US3648616A (en) Multistage power load
Nelson Low-yield earth-penetrating nuclear weapons
US6283036B1 (en) Variable output warhead
US3718512A (en) Porous particles containing dispersed organic liquid and gaseous components
US5390580A (en) Lightweight explosive and fire resistant container
US3537397A (en) Pyrotechnic signaling device having water reactive igniter
US5158173A (en) Weapons storage container to prevent sympathetic detonation of adjacent weapons