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US20130164484A1 - Lightweight impact resistant panel - Google Patents

Lightweight impact resistant panel Download PDF

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Publication number
US20130164484A1
US20130164484A1 US13/819,428 US201113819428A US2013164484A1 US 20130164484 A1 US20130164484 A1 US 20130164484A1 US 201113819428 A US201113819428 A US 201113819428A US 2013164484 A1 US2013164484 A1 US 2013164484A1
Authority
US
United States
Prior art keywords
panel
cavities
lightweight
core
impact resistant
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.)
Abandoned
Application number
US13/819,428
Other languages
English (en)
Inventor
Gigi Simovich
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.)
Individual
Original Assignee
Individual
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
Application filed by Individual filed Critical Individual
Publication of US20130164484A1 publication Critical patent/US20130164484A1/en
Abandoned legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B3/00—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form
    • B32B3/10—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by a discontinuous layer, i.e. formed of separate pieces of material
    • B32B3/12—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by a discontinuous layer, i.e. formed of separate pieces of material characterised by a layer of regularly- arranged cells, e.g. a honeycomb structure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F41—WEAPONS
    • F41H—ARMOUR; ARMOURED TURRETS; ARMOURED OR ARMED VEHICLES; MEANS OF ATTACK OR DEFENCE, e.g. CAMOUFLAGE, IN GENERAL
    • F41H5/00—Armour; Armour plates
    • F41H5/02—Plate construction
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F41—WEAPONS
    • F41H—ARMOUR; ARMOURED TURRETS; ARMOURED OR ARMED VEHICLES; MEANS OF ATTACK OR DEFENCE, e.g. CAMOUFLAGE, IN GENERAL
    • F41H5/00—Armour; Armour plates
    • F41H5/24—Armour; Armour plates for stationary use, e.g. fortifications ; Shelters; Guard Booths
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F41—WEAPONS
    • F41H—ARMOUR; ARMOURED TURRETS; ARMOURED OR ARMED VEHICLES; MEANS OF ATTACK OR DEFENCE, e.g. CAMOUFLAGE, IN GENERAL
    • F41H7/00—Armoured or armed vehicles
    • F41H7/02—Land vehicles with enclosing armour, e.g. tanks
    • F41H7/04—Armour construction
    • F41H7/042—Floors or base plates for increased land mine protection
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/23—Sheet including cover or casing
    • Y10T428/231—Filled with gas other than air; or under vacuum
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/249921—Web or sheet containing structurally defined element or component
    • Y10T428/249953—Composite having voids in a component [e.g., porous, cellular, etc.]
    • Y10T428/249976—Voids specified as closed

Definitions

  • This invention is in the field of vehicle structural element and anti ballistic armor.
  • an incompressible fluid will refer to a liquid or other substance that will undergo small volumetric change when subjected to high isostatic pressure, and the material will not remain solid, and flow, when subjected to shear forces, for example: water, oil, slurry, paste, sand, ceramic powder and tar.
  • a fluid will refer to a gas, a liquid or incompressible fluid as described above.
  • a vehicle will refer to space, ground, air, and water borne vehicles like cars, drones, airplanes satellites, tanks and ships.
  • Inflatable structures are known to be used in tents made of impervious fabric in the form of interconnected long gas tight chambers. This structure is only at its functional shape and rigid when inflated.
  • an armor apparatus comprising a layer of parallel pressurized tubes that contain fire retardant, among other chemicals, Silicon gel is interposed between the tubes.
  • the tubes while providing structural rigidity along their length provide little or no substantial rigidity in lateral direction.
  • FRP fiber reinforced plastic
  • the core holds the sheets apart and thus provide high bending moment of inertia to the panels.
  • the first choice is to increase the core width and to reduce the width of the peripheral skin surfaces; this will increase the overall moment of inertia while maintaining the weight low.
  • the lightweight core can be for example a honeycomb of Aluminum foil, rigid foam, Balsa wood and metal fin structure.
  • the core When pressure or bending moment is applied to such a panel, the core is compressed. In order to maintain the peripheral sheets apart under this compression, the core must be strong and rigid.
  • the present invention relates to lightweight panel comprising at least two peripheral skin surfaces made of high tensile strength material.
  • the panel comprises a lightweight core interlayer.
  • the core interlayer is characterized in comprising a pattern of sealed gas pressurized cavities.
  • the core interlayer further comprises a high strength structure which defines the cavities and holds the skin surfaces in place against the action of the gas pressure.
  • the core interlayer pattern can be, for example, a series of parallel cavities, a fined structure like honeycomb, or random pattern shaped metal foam.
  • the gas pressure is not essential to obtain the panel's shape, its main contribution is hidden from the eye and it is manifested in a favorable stress regime which develops in the structure and increases its stability.
  • the increased stability also enables to design a lighter and more rigid panel with thinner peripheral surfaces and with lighter or thicker core.
  • panels are chosen to have skin surfaces and a core pattern with parallel cavities made of the same material, it can sometimes be advantageous to form such a panel by extrusion or pultrusion.
  • the boundary between the core and the peripheral surfaces can sometimes be hard to define.
  • Each cavity is sealed with appropriate plugs that are provided at the each cavity edge.
  • Pressurized gas or air can be introduced into the cavities through valves that can be fitted to the plugs.
  • ihe gas pressure can also be monitored and maintained periodically through such valves.
  • tension develops in the peripheral skin surfaces and in the core solid structure pattern, This pressurization increases the stability of the structure. It is the purpose of this invention to provide a lightweight panel of high stability and high resistance to local buckling, to be used in structural element in vehicles, like car doors that are safer against collisions.
  • the panel of the present invention can be used in aircraft, spacecraft and missile skins.
  • the panel can easily be shaped to be single curved or cylindrical.
  • Pressurized gas is lightweight.
  • the gas acts to absorb energy from external penetrating objects
  • a lost in cavity pressure can cause a weakening of the panel.
  • a rupture in the panel's skin can also cause a harmful discharge of energetic gas.
  • the present invention provides an embodiment that comprises self sealing cavity means. These means can avoid or delay the discharge of gas in case of a small rupture.
  • One method of obtaining a self sealing cavity is to dispose lightweight sealers that would conform to the shape of the cavity's cross section and that would be allowed to move in the cavity.
  • the sealers are preferably made with some rubber that can deform under pressure and seal a deformed cavity.
  • Another method of obtaining a self sealing cavity is to dispose separation walls in the cavity; each wall comprises a self sealing valve between the two separated cavity sections.
  • the self sealing valve would close in case a high pressure difference would occur between the separated sections.
  • the valve will be open when the pressure difference is small.
  • the valve will allow the filling and discharging of gas in production and maintenance and would stop or delay the gas discharge in case of a local rupture.
  • the pressures that can be practiced are from about 1 MPa for thin walled panels to pressures in the order of 100 Mpa for compact thick walled ballistic resistant panels.
  • Creep, tensile strength, fatigue and temperature and work regime are to be taken into consideration when designing a panel.
  • a lightweight panel comprising at least two peripheral skin surfaces made of high tensile strength material.
  • the panel comprises a lightweight core interlayer.
  • the core interlayer is characterized in comprising a pattern of sealed cavities pressurized with incompressible fluid. When using water for example instead of pressurized gas, a burst of a panel would be much less energetic and therefore safer.
  • Another advantage of using a incompressible fluid is that the panel's cavities self pressurize when the panel is subjected to impact or deformation. This phenomenon is used by those who bend tubes by filling them first with sand or liquid.
  • the incompressible fluid disposed in the panel's core sealed cavities can increase its stability even without pre-pressurizing it.
  • FIG. 1 is a schematic depiction in isometric projection with sectional view of a hollow lightweight panel made of high tensile strength rigid material.
  • the panel's core comprises multiple parallel elongated cavities.
  • the cavities are sealed and pressurized with gas; the cavities are cylindrical and arranged in parallel in a single layer.
  • FIG. 2 is a schematic depiction in isometric projection with broken view of a hollow lightweight panel made of high tensile strength rigid material.
  • the panel's core comprises multiple cylindrical elongated cavities.
  • the cavities are sealed and pressurized with gas, the cavities arranged in parallel in two layers.
  • FIG. 3 is a schematic depiction in isometric projection with broken view of a hollow thin walled lightweight panel made of high tensile strength rigid material.
  • the panel's core comprises multiple cavities.
  • the cavities are sealed and pressurized with a gas; the panel comprises a pattern of elongated cavities and fins arranged in parallel in a single layer.
  • FIG. 4 is a schematic depiction in isometric projection with sectional view of a hollow lightweight cylindrical shaped panel, made of high tensile strength rigid material.
  • the panel's core comprises multiple cavities.
  • the cavities are sealed and pressurized with gas; the board comprises multiple elongated cylindrical cavities arranged in parallel to the main cylindrical panel's axis.
  • FIG. 1 is a schematic depiction in isometric projection with sectional view of a hollow lightweight panel 11 made of high tensile strength rigid material preferably by an Aluminum alloy extrusion.
  • the panel's core comprises multiple parallel elongated cavities 10 .
  • the cavities 10 are sealed and pressurized with gas; the cavities are cylindrical and arranged in parallel in a single layer.
  • each cavity is sealed by plugs (not shown) at their ends; each cavity is fitted with a filling valve (not shown).
  • FIG. 2 is a schematic depiction in isometric projection with broken view of a hollow lightweight panel 21 made of high tensile strength rigid material.
  • the panel's core comprises multiple cylindrical elongated cavities 20 .
  • the cavities are sealed and pressurized with gas; the cavities are arranged in parallel in two layers.
  • each cavity is sealed by plugs (not shown) at their ends; each cavity is fitted with a filling valve (not shown).
  • FIG. 3 is a schematic depiction in isometric projection with broken view of a hollow thin walled lightweight panel 31 made of high tensile strength rigid material.
  • the panel's core comprises multiple cavities 30 .
  • the cavities are sealed and pressurized with a gas; the panel comprises a pattern of elongated cavities and fins 32 arranged in parallel in a single layer.
  • the shape of the cavity is chosen as the shape that would provide the maximum volume for given fin and cavity perimeter length.
  • each cavity is sealed by plugs (not shown) at their ends; each cavity is fitted with a filling valve (not shown).
  • FIG. 4 is a schematic depiction in isometric projection with sectional view of a hollow lightweight cylindrical shaped panel 42 comprising an internal main surface 41 , made of high tensile strength rigid material.
  • the panel's core comprises multiple cavities 40 .
  • the cavities are sealed and pressurized with gas; the board comprises multiple elongated cylindrical cavities arranged in parallel to the main cylindrical panel's axis.
  • the cavities are sealed and interconnected (not shown) at their ends; the cavities are fitted with a filling valve (not shown).
  • This embodiment can reduce the weight is rocket skin envelopes where high rigidity and low weight are critical.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Laminated Bodies (AREA)
US13/819,428 2010-12-13 2011-11-20 Lightweight impact resistant panel Abandoned US20130164484A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
IL209950 2010-12-13
IL209950A IL209950A0 (en) 2010-12-13 2010-12-13 Lightweight impact resistant panel
PCT/IL2011/000899 WO2012081002A1 (fr) 2010-12-13 2011-11-20 Panneau léger résistant aux impacts

Publications (1)

Publication Number Publication Date
US20130164484A1 true US20130164484A1 (en) 2013-06-27

Family

ID=44718537

Family Applications (1)

Application Number Title Priority Date Filing Date
US13/819,428 Abandoned US20130164484A1 (en) 2010-12-13 2011-11-20 Lightweight impact resistant panel

Country Status (3)

Country Link
US (1) US20130164484A1 (fr)
IL (1) IL209950A0 (fr)
WO (1) WO2012081002A1 (fr)

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3969563A (en) * 1969-08-28 1976-07-13 Hollis Sr Russell E Protective wall structure
US4555134A (en) * 1983-07-20 1985-11-26 Leo Gruna Crush resistant motor vehicle body
US4883299A (en) * 1988-04-07 1989-11-28 Bonar George D Bumper
US5471905A (en) * 1993-07-02 1995-12-05 Rockwell International Corporation Advanced light armor
US5716693A (en) * 1995-11-06 1998-02-10 Pittman; Douglas E. High strength, lightweight pressurized structure for use as the skin of a spacecraft or other vehicle
US6418832B1 (en) * 2000-04-26 2002-07-16 Pyramid Technologies International, Inc. Body armor
US20030101636A1 (en) * 2001-12-05 2003-06-05 Pippert Joel James Self-sealing decoy
US20050025929A1 (en) * 2003-07-28 2005-02-03 Smith Lance D. Sandwich panel with interior barrier
US20060065111A1 (en) * 2002-04-17 2006-03-30 Henry James J M Armor system

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4132271A (en) * 1977-07-11 1979-01-02 The United States Of America As Represented By The Secretary Of The Army Fragment prevention screen for explodable fire suppressant panels
US5762145A (en) * 1996-12-03 1998-06-09 Bennett; Joseph Michael Highway vehicle fuel tank fire protection device
US7762175B1 (en) * 2006-11-30 2010-07-27 Honeywell International Inc. Spaced lightweight composite armor
ITFI20090130A1 (it) * 2009-06-17 2010-12-18 Ind Bitossi Spa Componenti per corazze ceramiche.

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3969563A (en) * 1969-08-28 1976-07-13 Hollis Sr Russell E Protective wall structure
US4555134A (en) * 1983-07-20 1985-11-26 Leo Gruna Crush resistant motor vehicle body
US4883299A (en) * 1988-04-07 1989-11-28 Bonar George D Bumper
US5471905A (en) * 1993-07-02 1995-12-05 Rockwell International Corporation Advanced light armor
US5716693A (en) * 1995-11-06 1998-02-10 Pittman; Douglas E. High strength, lightweight pressurized structure for use as the skin of a spacecraft or other vehicle
US6418832B1 (en) * 2000-04-26 2002-07-16 Pyramid Technologies International, Inc. Body armor
US20030101636A1 (en) * 2001-12-05 2003-06-05 Pippert Joel James Self-sealing decoy
US20060065111A1 (en) * 2002-04-17 2006-03-30 Henry James J M Armor system
US20050025929A1 (en) * 2003-07-28 2005-02-03 Smith Lance D. Sandwich panel with interior barrier

Also Published As

Publication number Publication date
IL209950A0 (en) 2011-02-28
WO2012081002A1 (fr) 2012-06-21

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