DE102009024829A1 - Crash-optimized bumper bracket for body structure of vehicle, particularly motor vehicle, is made of small ductile material, and is formed by closed or open hollow section - Google Patents
Crash-optimized bumper bracket for body structure of vehicle, particularly motor vehicle, is made of small ductile material, and is formed by closed or open hollow section Download PDFInfo
- Publication number
- DE102009024829A1 DE102009024829A1 DE200910024829 DE102009024829A DE102009024829A1 DE 102009024829 A1 DE102009024829 A1 DE 102009024829A1 DE 200910024829 DE200910024829 DE 200910024829 DE 102009024829 A DE102009024829 A DE 102009024829A DE 102009024829 A1 DE102009024829 A1 DE 102009024829A1
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- Germany
- Prior art keywords
- crash
- bending beam
- optimized
- wave
- vehicle
- 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.)
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R19/00—Wheel guards; Radiator guards, e.g. grilles; Obstruction removers; Fittings damping bouncing force in collisions
- B60R19/02—Bumpers, i.e. impact receiving or absorbing members for protecting vehicles or fending off blows from other vehicles or objects
- B60R19/18—Bumpers, i.e. impact receiving or absorbing members for protecting vehicles or fending off blows from other vehicles or objects characterised by the cross-section; Means within the bumper to absorb impact
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D21/00—Understructures, i.e. chassis frame on which a vehicle body may be mounted
- B62D21/15—Understructures, i.e. chassis frame on which a vehicle body may be mounted having impact absorbing means, e.g. a frame designed to permanently or temporarily change shape or dimension upon impact with another body
- B62D21/157—Understructures, i.e. chassis frame on which a vehicle body may be mounted having impact absorbing means, e.g. a frame designed to permanently or temporarily change shape or dimension upon impact with another body for side impacts
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R19/00—Wheel guards; Radiator guards, e.g. grilles; Obstruction removers; Fittings damping bouncing force in collisions
- B60R19/02—Bumpers, i.e. impact receiving or absorbing members for protecting vehicles or fending off blows from other vehicles or objects
- B60R19/18—Bumpers, i.e. impact receiving or absorbing members for protecting vehicles or fending off blows from other vehicles or objects characterised by the cross-section; Means within the bumper to absorb impact
- B60R2019/1806—Structural beams therefor, e.g. shock-absorbing
- B60R2019/1813—Structural beams therefor, e.g. shock-absorbing made of metal
- B60R2019/182—Structural beams therefor, e.g. shock-absorbing made of metal of light metal, e.g. extruded
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D29/00—Superstructures, understructures, or sub-units thereof, characterised by the material thereof
- B62D29/007—Superstructures, understructures, or sub-units thereof, characterised by the material thereof predominantly of special steel or specially treated steel, e.g. stainless steel or locally surface hardened steel
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D29/00—Superstructures, understructures, or sub-units thereof, characterised by the material thereof
- B62D29/008—Superstructures, understructures, or sub-units thereof, characterised by the material thereof predominantly of light alloys, e.g. extruded
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D29/00—Superstructures, understructures, or sub-units thereof, characterised by the material thereof
- B62D29/04—Superstructures, understructures, or sub-units thereof, characterised by the material thereof predominantly of synthetic material
- B62D29/041—Understructures
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Transportation (AREA)
- Body Structure For Vehicles (AREA)
- Vibration Dampers (AREA)
Abstract
Description
Die Erfindung betrifft einen crashoptimierten Biegeträger einer Karosseriestruktur eines Fahrzeugs, insbesondere Kraftfahrzeug, gemäß der Merkmalskombination des Patentanspruchs 1.The The invention relates to a crash-optimized bending beam of a Body structure of a vehicle, in particular motor vehicle, according to the combination of features of the claim 1.
Aus
der Praxis ist es seit geraumer Zeit bekannt, im Falle eines Crashereignisses
stoßbelastete Bauteile der Karosserie eines Kraftfahrzeugs,
wie beispielsweise äußere Längsträger,
vordere und hintere Stoßfängerquerträger,
Karosseriesäulen und dgl. mehr, Anstoßenergie
absorbierend auszubilden, indem der Wandung besagter Träger
wenigstens abschnittsweise ein oder mehrere Strukturelemente mit einer
Wellenstruktur zugeordnet werden und/oder deren Wandung selbst durch
eine Wellenstruktur gebildet wird. So ist aus der
Es besteht der Trend zur Erhöhung der Leichtbaugüte der Rohbaustruktur durch den Einsatz von hochfesten Stählen und/oder Leichtbaumaterialien, wie Leichtmetallen, Kohlefaserverbundkunststoffen u. a., welche allerdings gegenüber konventionellen Stahlblechwerkstoffen eine geringere Duktilität aufweisen. In der Praxis wurde gefunden, dass derartige Träger, insbesondere Biegeträger, die ihrerseits aus Werkstoffen geringer Duktilität bestehen, nach Erreichen einer bestimmten Belastungsgrenze bzw. eines bestimmten Verformungszustandes abrupt kollabieren, d. h., „katastrophal” versagen können, woraus resultiert, dass z. B. bei einem in Versuchen durchgeführten Pfahlaufprall, eine zu hohe Eindringtiefe des Pfahls beispielsweise in die Fahrgastzelle zu verzeichnen ist. Hier setzt die nachfolgend beschriebene Erfindung an.It there is a trend towards increasing the lightweight construction quality the bodyshell structure through the use of high-strength steels and / or lightweight materials, such as light metals, carbon fiber composites u. a., Which, however, compared to conventional steel sheet materials have a lower ductility. In practice was found that such carriers, in particular bending beams, which, in turn, consist of low ductility materials Reaching a certain load limit or a specific Abruptly collapse the deformation state, d. h., "catastrophic" fail can, resulting in that z. B. at a try carried out pile impact, too high a penetration depth of the pile is recorded for example in the passenger compartment. This is where the invention described below begins.
Aufgabe der Erfindung ist es, einen aus einem Werkstoff geringer Duktilität bestehenden Biegeträger einer Karosseriestruktur eines Fahrzeugs, insbesondere Kraftfahrzeugs, im Hinblick auf ein etwaiges Crashereignis derart zu optimieren und weiterzubilden, dass die vorstehend beschriebenen Nachteile, d. h., ein abruptes Kollabieren desselben, einhergehend mit einer zu hohen Eindringtiefe des Crashgegners in die Karosseriestruktur weitestgehend vermieden ist.task The invention is one of a material of low ductility existing bending beam of a body structure of a Vehicle, in particular motor vehicle, with regard to a possible To optimize crash event in such a way and further, that the disadvantages described above, d. h., an abrupt collapse the same, accompanied by too high penetration depth of the crash opponent is largely avoided in the body structure.
Der Erfindung liegt die Erkenntnis zugrunde, dass durch kontrolliertes Reißen der Profilwandung vorteilhaft Anstoßenergie absorbiert und ein abruptes Kollabieren des Biegeträgers verhindert werden kann.Of the Invention is based on the finding that controlled by Tearing the profile wall advantageous impact energy absorbed and an abrupt collapse of the bending beam can be prevented.
Die gestellte Aufgabe wird demnach mit einem crashoptimierten Biegeträger einer Karosseriestruktur eines Fahrzeugs, insbesondere Kraftfahrzeugs, gelöst, welcher aus einem Werkstoff geringer Duktilität besteht und durch ein geschlossenes oder offenes Hohlprofil gebildet ist, das im Falle eines etwaigen Crashereignisses infolge einer bestimmten auf dasselbe einwirkenden Kraft „F” einer Biegebeanspruchung unterliegt, wobei zumindest eine parallel oder weitestgehend parallel zur Belastungsrichtung angeordnete Profilwandung des besagten Hohlprofils zumindest lokal wenigstens eine Wellenstruktur aufweist, und wobei wenigstens ein Wellental und/oder ein Wellenberg der wenigstens einen Wellenstruktur zumindest eine Sollbruchstelle aufweist, die im Falle des Überschreitens einer bestimmten Biegebeanspruchung des Hohlprofils eine kontrollierte Rissinitiierung und/oder eine kontrollierte Rissbildung und/oder einen kontrollierten Rissfortschritt in der besagten Profilwandung gestattet.The Asked task is therefore with a crash-optimized bending beam a body structure of a vehicle, in particular motor vehicle, solved, which consists of a material of low ductility exists and formed by a closed or open hollow profile is, in the event of a possible crash event as a result of certain force acting on the same "F" one Bending stress is subject, at least one parallel or largely arranged parallel to the loading direction profile wall said hollow profile at least locally at least one wave structure and wherein at least one trough and / or a wave crest the at least one corrugated structure at least one predetermined breaking point which, in the case of exceeding a certain bending stress the hollow profile controlled crack initiation and / or a controlled cracking and / or controlled crack propagation allowed in the said profile wall.
Durch die kontrollierte Rissinitiierung, die kontrollierte Rissbildung und/oder den kontrollierten Rissfortschritt wird, wie bereits oben angedeutet, ein abruptes Kollabieren des besagten Biegeträgers aus einem Werkstoff geringer Duktilität wirkungsvoll vermieden. Durch das kontrollierte Reißen der Profilwandung wird vorteilhaft Anstoßenergie absorbiert, welches sich weiter vorteilhaft dahingehend auswirkt, dass die Eindringtiefe eines Crashgegners in die Karosseriestruktur des Fahrzeugs erheblich gemindert ist.By Controlled crack initiation, controlled cracking and / or the controlled crack propagation, as above indicated, an abrupt collapse of the said bending beam made of a material low ductility effectively avoided. The controlled tearing of the profile wall will be advantageous Impact energy absorbed, which is further advantageous to the effect that the penetration depth of a crash opponent is significantly reduced in the body structure of the vehicle.
Die Unteransprüche beschreiben bevorzugte Weiterbildungen oder Ausgestaltungen der Erfindung.The Subclaims describe preferred developments or Embodiments of the invention.
Danach ist besagte Sollbruchstelle durch Materialausdünnung der Profilwandung und/oder durch eine oder mehrere Ausnehmungen in derselben gebildet, welches sich einfach und kostengünstig bewerkstelligen lässt, wobei der Grad der Materialausdünnung und die erforderliche Anzahl der Ausnehmungen sowie deren Gestalt in Abhängigkeit von einer bestimmten Anstoß-Kraft „F” rechnerisch und/oder empirisch im Rahmen von Versuchen ermittelbar ist.Thereafter, said predetermined breaking point by material thinning the profile wall and / or formed by one or more recesses in the same, which can be accomplished easily and inexpensively, wherein the degree of material thinning and the required number of recesses and their shape depending on a certain abutment force "F" mathematically and / or empirically in the context of Try can be determined.
Gemäß einer ersten vorteilhaften Ausgestaltungsvariante der Erfindung können sich die Wellen der wenigstens einen Wellenstruktur in der Ebene der besagten Profilwandung quer zur Belastungsrichtung linear erstrecken, welches eine äußerst einfache und kostengünstig zu bewerkstelligende Ausgestaltung darstellt. Demgegenüber können sich gemäß einer zweiten vorteilhaften Ausgestaltungsvariante der Erfindung die Wellen der wenigstens einen Wellenstruktur jedoch auch in der Ebene der besagten Profilwandung entlang einer Kurvenbahn erstrecken, wodurch das Riss- und demgemäß Energieabsorptionsverhalten des Biegeträgers im Falle eines etwaigen Crashereignisses noch besser einstellbar ist. Gleiches oder ähnliches ist zu verzeichnen wenn die Wellen der wenigstens einen Wellenstruktur gemäß einer weiteren Ausgestaltungsvariante der Erfindung in der Ebene der besagten Profilwandung konzentrische Kreise und/oder Kreisabschnitte ausbilden.According to one first advantageous embodiment variant of the invention can the waves of at least one wave structure in the plane of said profile wall extend linearly transversely to the loading direction, which is an extremely simple and inexpensive represents to bewerkstelligende design. In contrast, can according to a second advantageous Embodiment variant of the invention, the waves of at least one wave structure but also in the plane of the said profile along a wall Curve track, whereby the crack and thus energy absorption behavior the bending beam in case of a possible crash event even better is adjustable. Same or similar is to note if the waves of at least one wave structure According to a further embodiment variant of Invention concentric in the plane of the said profile wall Form circles and / or sections of circle.
Ein derartiger crashoptimierter Biegeträger kann dabei aus einem hochfesten Stahl, einem Leichtmetall, einem Kohlefaserverbundkunststoff (CCFRC = Continuous Carbon Fibre Reinforced Composit) oder jeglichem anderen an sich bekannten geeigneten Werkstoff mit geringer Duktilität bestehen.One Such crash-optimized bending beam can from a high-strength steel, a light metal, a carbon fiber composite plastic (CCFRC = Continuous Carbon Fiber Reinforced Composite) or any other known per se suitable material with low ductility consist.
Besonders vorteilhaft bietet sich ein derartiger crashoptimierter Biegeträger zur wenigstens abschnittsweisen Ausbildung einer Rahmenstruktur, eines Schwellers, eines Türbrüstungsträgers, eines Säulenelementes, eines Stoßfängers, insbesondere Stoßfängerquerträgers, und/oder eines jeglichem anderen denkbaren Trägers respektive Biegeträgers der Karosseriestruktur eines Fahrzeugs, insbesondere Kraftfahrzeugs, an.Especially advantageously offers such a crash-optimized bending beam at least partially forming a frame structure, a sill, a door balustrade, a column element, a bumper, in particular bumper cross member, and / or any other conceivable carrier or bending carrier of the Body structure of a vehicle, in particular motor vehicle, at.
Die Erfindung wird nachstehend anhand der in den Zeichnungen schematisch dargestellten Ausführungsbeispiele näher erläutert. Es zeigen:The The invention will be described below with reference to the drawings illustrated embodiments explained in more detail. Show it:
Um
im Falle eines Crashereignisses des Kraftfahrzeugs, beispielsweise
nach Art eines Pfahlaufpralls, vorteilhaft Anstoßenergie
zu absorbieren, weist die Profilwandung
Häufig werden, wie bereits einleitend erörtert, zur Erhöhung der Leichtbaugüte der Rohbaustruktur eines Fahrzeugs, insbesondere Kraftfahrzeugs, für die in Rede stehenden Biegeträger hochfeste Stähle und/oder Leichtbaumaterialien, wie Leichtmetalle (Aluminium o. a.), an sich bekannte Kohlefaserverbundkunststoffe (CCFRC = Continuous Carbon Fibre Reinforced Composit) u. a. verwendet, welche allerdings gegenüber konventionellen Stahlblechwerkstoffen eine geringere Duktilität aufweisen.Often, as already discussed in the introduction, to increase the lightweight construction of the bodyshell structure of a vehicle, in particular motor vehicle, high strength steels and / or lightweight materials, such as light metals (aluminum or the like), known per se carbon fiber composite plastics (CCFRC = Conti nuous Carbon Fiber Reinforced Composite), which, however, have lower ductility than conventional steel sheet materials.
In der Praxis wurde nunmehr gefunden, dass derartige aus Werkstoffen geringer Duktilität bestehende Biegeträger nach Erreichen einer bestimmten Belastungsgrenze bzw. eines bestimmten Verformungszustandes abrupt kollabieren, d. h., „katastrophal” versagen können, woraus resultiert, dass z. B. bei einem in Versuchen durchgeführten Pfahlaufprall, eine zu hohe Eindringtiefe des Pfahls beispielsweise in die Fahrgastzelle des Fahrzeugs zu verzeichnen ist.In In practice, it has now been found that such materials low ductility existing bending beam after Reaching a certain load limit or a specific Abruptly collapse the deformation state, d. h., "catastrophic" fail can, resulting in that z. B. at a try carried out pile impact, too high a penetration depth of the pile, for example, in the passenger compartment of the vehicle is recorded.
So
zeigt die
Um
dem vorstehend beschriebenen Problem zu begegnen, weisen wenigstens
ein Wellental
Gemäß den
Besagte
Materialausdünnung kann dabei über die Längserstreckung
der Wellenstruktur
Die
Erfindung beschränkt sich jedoch nicht auf dieses konkrete
Ausführungsbeispiel, sondern erfasst auch Hohlprofile
Des
Weiteren beschränkt sich die Erfindung nicht nur auf besagtes
kastenförmiges Hohlprofil
In
umfangreichen Versuchen wurde gefunden, dass durch einen besonderen
Verlauf der Wellen der Wellenstruktur
So
zeigen die
Demgegenüber
kann es jedoch auch gemäß den
Das
Ausführungsbeispiel nach
Durch
lokale Variation der Anzahl besagter Ausnehmungen
Der erfindungsgemäße bzw. crashoptimierte Biegeträger eignet sich besonders zur wenigstens abschnittsweisen Ausbildung einer Rahmenstruktur, eines Schwellers, eines Türbrüstungsträgers, eines Säulenelementes, eines Stoßfängers, insbesondere Stoßfängerquerträgers, und/oder eines jeglichem anderen denkbaren Trägers der Karosseriestruktur eines Fahrzeugs, insbesondere Kraftfahrzeugs, welcher im Crashfall biegedominant beansprucht wird.Of the inventive or crash-optimized bending beam is particularly suitable for at least sections of training a frame structure, a sill, a door balustrade, a column element, a bumper, in particular bumper cross member, and / or any other conceivable carrier of the body structure a vehicle, in particular motor vehicle, which in the event of a crash bending dominant is claimed.
- 11
- AuflagerIn stock
- 22
- AuflagerIn stock
- 33
- Druckstempelplunger
- 44
- Dreipunkt-BiegevorrichtungThree-point bending device
- 55
- Hohlprofilhollow profile
- 66
- Profilwandungprofile wall
- 7, 7', 7''7, 7 ', 7' '
- Wellenstrukturwave structure
- 7a7a
- Wellentaltrough
- 7b7b
- WellenbergWellenberg
- 88th
- Belastungsrichtungload direction
- 99
- SollbruchstelleBreaking point
- 1010
- Rissecracks
- 1111
- KrafteinleitungsbereichForce application area
- 1212
- Ausnehmungenrecesses
- „F”"F"
- Anstoß-KraftImpulse-force
- „s1”"S 1 "
-
Materialstärke
(Wellenberg
7b )Material thickness (wave crest7b ) - „s2”"S 2 "
-
Materialstärke
(Wellental
7a )Material thickness (wave trough7a )
ZITATE ENTHALTEN IN DER BESCHREIBUNGQUOTES INCLUDE IN THE DESCRIPTION
Diese Liste der vom Anmelder aufgeführten Dokumente wurde automatisiert erzeugt und ist ausschließlich zur besseren Information des Lesers aufgenommen. Die Liste ist nicht Bestandteil der deutschen Patent- bzw. Gebrauchsmusteranmeldung. Das DPMA übernimmt keinerlei Haftung für etwaige Fehler oder Auslassungen.This list The documents listed by the applicant have been automated generated and is solely for better information recorded by the reader. The list is not part of the German Patent or utility model application. The DPMA takes over no liability for any errors or omissions.
Zitierte PatentliteraturCited patent literature
- - EP 0266084 A2 [0002] EP 0266084 A2 [0002]
- - US 5340178 A [0002] - US 5340178 A [0002]
- - EP 0912374 [0002] - EP 0912374 [0002]
- - EP 1892159 A2 [0002] EP 1892159 A2 [0002]
- - EP 1878620 A1 [0002] EP 1878620 A1 [0002]
Claims (7)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE200910024829 DE102009024829A1 (en) | 2009-06-13 | 2009-06-13 | Crash-optimized bumper bracket for body structure of vehicle, particularly motor vehicle, is made of small ductile material, and is formed by closed or open hollow section |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE200910024829 DE102009024829A1 (en) | 2009-06-13 | 2009-06-13 | Crash-optimized bumper bracket for body structure of vehicle, particularly motor vehicle, is made of small ductile material, and is formed by closed or open hollow section |
Publications (1)
Publication Number | Publication Date |
---|---|
DE102009024829A1 true DE102009024829A1 (en) | 2010-12-16 |
Family
ID=43069815
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE200910024829 Withdrawn DE102009024829A1 (en) | 2009-06-13 | 2009-06-13 | Crash-optimized bumper bracket for body structure of vehicle, particularly motor vehicle, is made of small ductile material, and is formed by closed or open hollow section |
Country Status (1)
Country | Link |
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DE (1) | DE102009024829A1 (en) |
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102010050160A1 (en) * | 2010-10-30 | 2012-05-03 | Volkswagen Ag | Method for influencing crack configuration of overload crack in surface or profile component made from steel of motor car, involves introducing local structural changes in area of free surfaces of vehicle part based on crack configuration |
DE102011115855A1 (en) | 2011-10-13 | 2013-04-18 | Audi Ag | Structure component e.g. elongated open-or closed-fiber-reinforced plastic profile part for front wagon of motor car, has open metal profile part whose face surfaces are aligned with attachment surfaces of plastic profile part |
DE102013103719A1 (en) | 2012-12-19 | 2014-06-26 | Dr. Ing. H.C. F. Porsche Aktiengesellschaft | Support structure of motor vehicle, has secondary material having higher ductility, which is compressible under action of tensile force of flexure support in event of impact, through the joining element for receiving deformation energy |
DE102013214717A1 (en) * | 2013-07-29 | 2015-01-29 | Bayerische Motoren Werke Aktiengesellschaft | Bend beam made of fiber-reinforced plastic of a motor vehicle body |
WO2015049088A1 (en) * | 2013-10-01 | 2015-04-09 | Bayerische Motoren Werke Aktiengesellschaft | Vehicle component made of fiber-reinforced plastic material and method for repairing damaged vehicle components made of fiber-reinforced plastic material |
DE102013223720A1 (en) * | 2013-11-20 | 2015-05-21 | Bayerische Motoren Werke Aktiengesellschaft | Motor vehicle with a body |
WO2015014620A3 (en) * | 2013-07-29 | 2015-08-20 | Bayerische Motoren Werke Aktiengesellschaft | Body of a vehicle having a body component made of fiber-reinforced plastic |
WO2016096470A1 (en) * | 2014-12-19 | 2016-06-23 | Bayerische Motoren Werke Aktiengesellschaft | Press-hardened sheet-metal component with at least one predetermined breaking point, and component assembly and motor vehicle body with such a sheet-metal component |
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-
2009
- 2009-06-13 DE DE200910024829 patent/DE102009024829A1/en not_active Withdrawn
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