DE3744348A1 - Composite element for absorbing energy - Google Patents
Composite element for absorbing energyInfo
- Publication number
- DE3744348A1 DE3744348A1 DE19873744348 DE3744348A DE3744348A1 DE 3744348 A1 DE3744348 A1 DE 3744348A1 DE 19873744348 DE19873744348 DE 19873744348 DE 3744348 A DE3744348 A DE 3744348A DE 3744348 A1 DE3744348 A1 DE 3744348A1
- Authority
- DE
- Germany
- Prior art keywords
- fibers
- composite body
- matrix
- body according
- absorbing energy
- 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.)
- Withdrawn
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
- C08J5/04—Reinforcing macromolecular compounds with loose or coherent fibrous material
- C08J5/046—Reinforcing macromolecular compounds with loose or coherent fibrous material with synthetic macromolecular fibrous material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B64—AIRCRAFT; AVIATION; COSMONAUTICS
- B64D—EQUIPMENT FOR FITTING IN OR TO AIRCRAFT; FLIGHT SUITS; PARACHUTES; ARRANGEMENTS OR MOUNTING OF POWER PLANTS OR PROPULSION TRANSMISSIONS IN AIRCRAFT
- B64D25/00—Emergency apparatus or devices, not otherwise provided for
- B64D25/02—Supports or holding means for living bodies
- B64D25/04—Seat modifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L63/00—Compositions of epoxy resins; Compositions of derivatives of epoxy resins
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F1/00—Springs
- F16F1/36—Springs made of rubber or other material having high internal friction, e.g. thermoplastic elastomers
- F16F1/366—Springs made of rubber or other material having high internal friction, e.g. thermoplastic elastomers made of fibre-reinforced plastics, i.e. characterised by their special construction from such materials
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2363/00—Characterised by the use of epoxy resins; Derivatives of epoxy resins
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2367/00—Characterised by the use of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Derivatives of such polymers
- C08J2367/06—Unsaturated polyesters
Abstract
Description
Die Erfindung betrifft einen Verbundkörper zum Absorbieren von Energie, bestehend aus in einer Matrix eingebetteten Fasern.The invention relates to a composite body for absorption of energy consisting of embedded in a matrix Fibers.
Derartige Verbundkörper werden beispielsweise eingesetzt für Fahrzeuge zur Halterung von Stoßstangen oder anderen Teilen, die bei einem Aufprall kinetische Energie in Verformungsenergie umsetzen sollen. Es sind Verbundkörper bekannt, bei welchen Glas- oder Kohlenstoffasern in einer Matrix aus Epoxyharz eingebettet sind. Derartige Verbundkörper, insbesondere mit Kohlenstoffasern können zwar eine relativ große Energie absorbieren, sie weisen jedoch ein unkontrolliertes Verhalten auf und sind derart spröde, daß sie bei einem Aufprall splittern und die mechanische Verbindung zerstört wird. Darüber hinaus sind Verbundkörper mit Kohlenstoffasern teuer.Composite bodies of this type are used, for example, for Vehicles for holding bumpers or other parts, the kinetic energy in the event of an impact Implement deformation energy. They are composite bodies known in which glass or carbon fibers in one Epoxy resin matrix are embedded. Such Composite bodies, in particular with carbon fibers, can absorb a relatively large amount of energy, but they exhibit an uncontrolled behavior and are so brittle, that they splinter on impact and the mechanical Connection is destroyed. In addition, are composite bodies expensive with carbon fibers.
Der Erfindung liegt die Aufgabe zugrunde, einen Verbundkörper zu schaffen, welcher bei einem großen Energieabsorptionsvermögen ein kontrolliertes Verhalten aufweist.The invention has for its object a To create composite body, which at a large Energy absorption capacity controlled behavior having.
Diese Aufgabe wird erfindungsgemäß dadurch gelöst, daß die Fasern aus einem linearen hochverstreckten Polyethylen (PE) mit ultrahohem Molekulargewicht bestehen und parallel zur Druckbeaufschlagungsrichtung ausgerichtet sind.This object is achieved in that the Linear highly stretched polyethylene (PE) fibers with ultra high molecular weight and parallel to Direction of pressure are aligned.
Ein Verfahren zur Herstellung derartiger Polyethylenfasern mit ultrahohem Molekulargewicht ist beispielsweise in der DE-OS 37 24 434 beschrieben. Dabei wird ein Polyolefin in einem Lösungsmittel aufgelöst, die Lösung wird bei einer Temperatur oberhalb der Lösungstemperatur des Polyolefins zu Fasern verformt, die Fasern werden auf eine Temperatur unterhalb der Lösetemperatur zur Gelierung abgekühlt und die Gelfasern werden verstreckt. Die Verstreckung erfolgt dabei unter Lösemittelentfernung. Damit ergeben sich Fasern mit extrem langen und stark orientierten Molekülen. Derartige Fasern in Verbundkörpern innerhalb einer Matrix aus einem Harz zeigen bei hoher Energieabsorption ein kontrolliertes Versagen, d.h. es ist abzusehen, wie und wann sich der Körper bei statischem oder dynamischem Aufbringen der Last verformt.A process for producing such polyethylene fibers with ultra high molecular weight is for example in the DE-OS 37 24 434 described. A polyolefin is used in dissolved in a solvent, the solution is at a Temperature above the solution temperature of the polyolefin Fibers deformed, the fibers are brought to a temperature cooled below the dissolving temperature for gelation and the Gel fibers are stretched. The stretching takes place with solvent removal. This results in fibers extremely long and strongly oriented molecules. Such Fibers in composite bodies within a matrix of one Resins show a controlled at high energy absorption Failure, i.e. it is foreseeable how and when the Body with static or dynamic application of the load deformed.
Die Polyethylene können in kleineren Mengen, vorzugsweise höchstens 5 Mol.-% eines oder mehrerer damit copolymerisierbarer anderer Alkene, wie Propylen, Butylen, Penten, Hexen, 4-Methylpenten, Octen, etc. enthalten und 1-10, insbesondere 2-6 Methyl- oder Ethylgruppen pro 1000 Kohlenstoffatomen aufweisen. Es kommen auch andere Polyolefine in Frage, beispielsweise Polypropylenhomo- und copolymere. Ferner können die eingesetzten Polyolefine auch kleinere Mengen eines oder mehrerer anderer Polymere enthalten, insbesondere Alken-l-Polymerer.The polyethylenes can be used in smaller amounts, preferably at most 5 mol% of one or more with it copolymerizable other alkenes, such as propylene, butylene, Contain pentene, hexene, 4-methylpentene, octene, etc. and 1-10, especially 2-6 methyl or ethyl groups per 1000 Have carbon atoms. Others are coming too Polyolefins in question, for example polypropylene homo- and copolymers. The polyolefins used can also smaller amounts of one or more other polymers contain, in particular alkene-1 polymer.
Gemäß einer bevorzugten Ausführungsform beträgt der Anteil der Fasern 40 bis 70 Vol.-% in dem Verbundkörper.According to a preferred embodiment, the proportion is of the fibers 40 to 70 vol .-% in the composite body.
Die Matrix, in welcher die PE-Fasern eingebettet sind, ist vorzugsweise ein Epoxyharz oder ein Polyester.The matrix in which the PE fibers are embedded is preferably an epoxy resin or a polyester.
Die Verbundkörper weisen vorzugsweise die Form von Stangen mit kreisförmigem oder rechteckigem Querschnitt auf. Sie können aber auch die Form von Rohren beliebigen Querschnitts aufweisen oder sie sind gewellt, wobei die Druckbeaufschlagungsrichtung parallel zur Breitenerstreckung der Wellen erfolgt. Gewellte Platten sind vorzugsweise an ihren Rändern eingespannt, so daß bei Aufbringen einer Last oder Schlag- oder Stoßkraft ein kontrolliertes Ausbeulen oder eine kontrollierte Faltenbildung erfolgt.The composite bodies are preferably in the form of rods with circular or rectangular cross-section. they can also take the shape of pipes of any cross-section have or they are wavy, the Direction of pressure parallel to the width the waves take place. Corrugated sheets are preferably on their edges clamped so that when applying a load or impact or impact a controlled dent or controlled wrinkling occurs.
Derartige Verbundkörper sind insbesondere geeignet für
Traggestelle von Hubschraubern, für Böden von Hubschraubern,
für Halterungen von Stoßstangen oder für Elemente, bei denen
mit dem Auftreffen von Stoß- oder Schlagenergien zu rechnen
ist.
Composite bodies of this type are particularly suitable for support frames for helicopters, for helicopter floors, for mounts for bumpers or for elements in which impact or impact energy is to be expected.
Die Erfindung wird nachstehend anhand der Zeichnung näher erläutert. Es zeigt:The invention will now be described with reference to the drawing explained. It shows:
Fig. 1 einen stabförmigen Verbundkörper mit kreisförmigem Querschnitt in perspektivischer Ansicht und Fig. 1 shows a rod-shaped composite body with a circular cross section in a perspective view
Fig. 2 den Verbundkörper nach Fig. 1 nach Auftreffen einer Last. Fig. 2 shows the composite body of FIG. 1 after impacting a load.
Bei dem in Fig. 1 gezeigten Verbundkörper 10 in Form eines Stabes mit kreisförmigem Querschnitt sind lineare hochverstreckte Polyethylenfasern 12 mit ultrahohem Molekulargewicht parallel zur Druckbeaufschlagungsrichtung, die durch den Pfeil 14 angedeutet ist, in einer Matrix 16 aus einem Epoxyharz eingebettet.In the composite body 10 shown in FIG. 1 in the form of a rod with a circular cross section, linear, highly stretched polyethylene fibers 12 with ultra-high molecular weight are embedded in a matrix 16 made of an epoxy resin parallel to the direction of pressure application, which is indicated by the arrow 14 .
Nach dem Aufbringen der Last 14 auf den Verbundkörper 10 nimmt dieser eine Form an, wie sie in Fig. 2 angedeutet ist. Etwa im mittleren Bereich bildet sich eine Ausbauchung 18 aus, wobei gleichzeitig die aufgebrachte Energie absorbiert und in Verformungsenergie umgewandelt wird. Je nach Geschwindigkeit der aufgebrachten Kraft bilden sich mehr oder weniger ausgeprägte Ausbauchungen aus.After the load 14 has been applied to the composite body 10 , it takes on a shape as indicated in FIG. 2. A bulge 18 forms approximately in the middle region, the applied energy being simultaneously absorbed and converted into deformation energy. Depending on the speed of the applied force, more or less pronounced bulges form.
Claims (6)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19873744348 DE3744348A1 (en) | 1987-12-28 | 1987-12-28 | Composite element for absorbing energy |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19873744348 DE3744348A1 (en) | 1987-12-28 | 1987-12-28 | Composite element for absorbing energy |
Publications (1)
Publication Number | Publication Date |
---|---|
DE3744348A1 true DE3744348A1 (en) | 1989-07-06 |
Family
ID=6343752
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE19873744348 Withdrawn DE3744348A1 (en) | 1987-12-28 | 1987-12-28 | Composite element for absorbing energy |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE3744348A1 (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2672351A1 (en) * | 1991-02-04 | 1992-08-07 | Hutchinson | ELASTIC SUPPORT WITH VARIABLE STIFFNESS. |
EP0515992A1 (en) * | 1991-05-27 | 1992-12-02 | Nippon Oil Co. Ltd. | Process for producing prepreg |
WO2007080113A2 (en) * | 2006-01-11 | 2007-07-19 | Dsm Ip Assets B.V. | Process for the production of a monolayer composite article, the monolayer composite article and a ballistic-resistant article |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3023726A1 (en) * | 1979-06-27 | 1981-01-15 | Stamicarbon | METHOD FOR PRODUCING FILAMENTS |
US4436274A (en) * | 1981-02-23 | 1984-03-13 | The B. F. Goodrich Company | Vibration dampening support |
EP0110021A2 (en) * | 1982-09-30 | 1984-06-13 | AlliedSignal Inc. | Producing modified high performance polyolefin fiber and film |
US4482592A (en) * | 1981-02-23 | 1984-11-13 | The B. F. Goodrich Company | Vibration isolation pad |
US4584347A (en) * | 1982-09-30 | 1986-04-22 | Allied Corporation | Modified polyolefin fiber |
US4612148A (en) * | 1982-12-28 | 1986-09-16 | Mitsui Petrochemical Industries, Ltd. | Process for producing stretched articles of ultrahigh-molecular-weight polyethylene |
-
1987
- 1987-12-28 DE DE19873744348 patent/DE3744348A1/en not_active Withdrawn
Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3023726A1 (en) * | 1979-06-27 | 1981-01-15 | Stamicarbon | METHOD FOR PRODUCING FILAMENTS |
US4436274A (en) * | 1981-02-23 | 1984-03-13 | The B. F. Goodrich Company | Vibration dampening support |
US4482592A (en) * | 1981-02-23 | 1984-11-13 | The B. F. Goodrich Company | Vibration isolation pad |
EP0110021A2 (en) * | 1982-09-30 | 1984-06-13 | AlliedSignal Inc. | Producing modified high performance polyolefin fiber and film |
US4455273A (en) * | 1982-09-30 | 1984-06-19 | Allied Corporation | Producing modified high performance polyolefin fiber |
US4584347A (en) * | 1982-09-30 | 1986-04-22 | Allied Corporation | Modified polyolefin fiber |
US4612148A (en) * | 1982-12-28 | 1986-09-16 | Mitsui Petrochemical Industries, Ltd. | Process for producing stretched articles of ultrahigh-molecular-weight polyethylene |
Cited By (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2672351A1 (en) * | 1991-02-04 | 1992-08-07 | Hutchinson | ELASTIC SUPPORT WITH VARIABLE STIFFNESS. |
EP0498710A2 (en) * | 1991-02-04 | 1992-08-12 | Hutchinson | Variable-stiffness elastic support |
EP0498710A3 (en) * | 1991-02-04 | 1992-09-23 | Hutchinson | Variable-stiffness elastic support |
EP0515992A1 (en) * | 1991-05-27 | 1992-12-02 | Nippon Oil Co. Ltd. | Process for producing prepreg |
US5612125A (en) * | 1991-05-27 | 1997-03-18 | Nippon Oil Co., Ltd. | Process for producing prepreg |
US5723388A (en) * | 1991-05-27 | 1998-03-03 | Nippon Oil Co., Ltd. | Prepreg of ultra-high-molecular-weight polyethylene |
WO2007080113A2 (en) * | 2006-01-11 | 2007-07-19 | Dsm Ip Assets B.V. | Process for the production of a monolayer composite article, the monolayer composite article and a ballistic-resistant article |
WO2007080113A3 (en) * | 2006-01-11 | 2007-08-30 | Dsm Ip Assets Bv | Process for the production of a monolayer composite article, the monolayer composite article and a ballistic-resistant article |
EA012988B1 (en) * | 2006-01-11 | 2010-02-26 | ДСМ АйПи АССЕТС Б.В. | Process for the production of a monolayer composite article, the monolayer composite article and a ballistic-resistance article |
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Legal Events
Date | Code | Title | Description |
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OP8 | Request for examination as to paragraph 44 patent law | ||
8130 | Withdrawal |