FIBRE COMPOSITE COMPONENT ACTING AS AN ACTUATOR, A SENSOR AND/OR A GENERATOR AND METHOD FOR THE PRODUCTION THEREOF

• US 20130106245A1
• Filed: 04/26/2011
• Published: 05/02/2013
• Est. Priority Date: 04/28/2010
• Status: Abandoned Application

• Current Assignee: Fraunhofer Gesellschaft Zur Foerderung Der Angewandten Forsching E.V.
• Original Assignee: Fraunhofer Gesellschaft Zur Foerderung Der Angewandten Forsching E.V.
• Inventors: Schoenecker, Andreas, Roedig, Thomas, Scheithauer, Uwe, Giebe, Andreas
• Application Number:
  US13/643,710
• Publication Number:
  US 20130106245A1
• Time in Patent Office: Days
• US Class Current: 310/340
• CPC Class Codes: B29C 70/08 comprising combinations of different forms of fibrous reinforcements incorporated in matrix material, forming one or more layers, and with or without non-reinforced layers
• CPC Class Codes: B29C 70/86 Incorporated in coherent impregnated reinforcing layers, e.g. by winding
• CPC Class Codes: B29C 70/88 characterised primarily by possessing specific properties, e.g. electrically conductive or locally reinforced
• CPC Class Codes: H10N 30/03 Assembling devices that include piezoelectric or electrostrictive parts
• CPC Class Codes: H10N 30/092 Forming composite materials
• CPC Class Codes: H10N 30/1061 based on piezoelectric or electrostrictive fibres
• CPC Class Codes: H10N 30/702 based on piezoelectric or electrostrictive fibres
• CPC Class Codes: Y10T 29/42 Piezoelectric device making

Abstract

The invention relates to fiber-reinforced composites acting as an actuator, as a sensor and/or as a generator and to a manufacturing process. It is the object of the invention to provide such fiber-reinforced composites which can be manufactured simply and reliably and which are securely fastened and exactly positioned as elements acting as actuators, generators and/or sensors. In a fiber-reinforced composite in accordance with the invention, at least one piezoelectric element is fixed and positioned by fibers or yarn within a fiber structure or by means of fibers or yarn to a fiber structure. Flexible, electrically conductive connections which can be contacted from outside the fiber-reinforced composite are led at and/or within the fiber structure to electric connector contacts of the at least one piezoelectric element. One or more piezoelectric elements, electrically conductive connections and the fiber structure are embedded in a matrix material.

Claims

1. A fiber-reinforced composite acting as an actuator, as a sensor and/or as a generator, wherein at least one piezoelectric element (1) of fibers or yarn (2) is fixed and positioned within a fiber structure or by means of fibers or yarn at a fiber structure and a flexible, electrically conductive connection (4) which can be contacted from outside the fiber-reinforced composite is guided at and/or within the fiber structure to electrical connector contacts (3) of the at least one piezoelectric element;

and

a piezoelectric element (1), electrically conductive connections (4) and the fiber structure are embedded in a matrix material.

2. A fiber-reinforced composite in accordance with claim 1, characterized in that the piezoelectric element(s) (1) is/are woven into the fiber structure, twisted therein, and/or is/are fastened thereat by a sewing or stitching connection.

3. A fiber-reinforced composite in accordance with claim 1, characterized in that electrically conductive connections (4) is/are woven into the fiber structure, twisted therein, inserted therein, and/or is/are fastened thereat by a sewing or stitching connection.

4. A fiber-reinforced composite in accordance with claim 1, characterized in that the fiber structure is formed as an areal textile fabric.

5. A fiber-reinforced composite in accordance with claim 1, characterized in that the piezoelectric element(s) is/are formed as a fiber.

6. A fiber-reinforced composite in accordance with claim 1, characterized in that a plurality of piezoelectric elements (1) are present in serial arrangement.

7. A fiber-reinforced composite in accordance with claim 1, characterized in that a plurality of fibrous piezoelectric elements (1) are jacketed by fibers and/or a material so that the piezoelectric elements (1) connected to one another in this manner form a correspondingly extended piezoelectric element.

8. A fiber-reinforced composite in accordance with claim 1, characterized in that piezoelectric elements (1) formed as hollow fibers are embedded in an electrically conductive matrix material and/or are fixed by means of electrically conductive fibers and an electrically conductive connection (4) is led to and/or through the hollow space of the respective hollow fiber and is electrically conductively contacted therein at the respective piezoelectric element (1).

9. A fiber-reinforced composite in accordance with claim 1, characterized in that (an) electrically conductive connection(s) (4) is/are positioned and electrically conductively fixed at connector contacts by means of fibers or yarn of the fiber structure.

10. A fiber-reinforced composite in accordance with claim 1, characterized in that the piezoelectric element(s) (1) is/are arranged in the fiber-reinforced composite in a plane outside the neutral fiber.

11. A method of manufacturing a fiber-reinforced composite in accordance with claim 1, characterized in that the at least one piezoelectric element (1) is fastened by fibers or yarn by means of a textile manufacturing process in the fiber structure or by a sewing or stitching connection at the fiber structure and electrically conductive connections (4) are led to electric connector contacts (3) present at the piezoelectric element(s) (1), and

the fiber structure prepared in this manner is subsequently embedded in a matrix material within a molding tool and the matrix material is hardened or completely polymerized.

12. A method in accordance with claim 11, characterized in that the fiber structure with a fixed piezoelectric element (1) and electrically conductive connections (4) is inserted into a molding tool and the matrix material is then injected or cast.

13. A method in accordance with claim 11, characterized in that at least two laminate layers are manufactured as intermediate products and subsequently the laminate layers are connected to one another with material continuity by hot pressing, with the at least two laminate layers having been manufactured by a fiber structure and a thermoplastic matrix material and in this respect at least one laminate layer being used into which at least one piezoelectric element (1) is integrated.

14. A method in accordance with claim 13, characterized in that, for the manufacture of a laminate layer as an intermediate product, a fiber structure is impregnated with a polymer, a hybrid yarn is used for the fiber structure and/or a polymer which is not completely hardened or polymerized is infiltrated into the fiber structure.

15. A method in accordance with claim 11, characterized in that at least one piezoelectric element (4) is introduced into at least one receiver formed at the textile fiber structure in the form of a loop or a pocket and is fixed at/in the fiber structure and the matrix material is subsequently hardened or completely polymerized.

16. A method in accordance with claim 11, characterized in that, for the manufacture, at least two fiber structures, in which at least one piezoelectric element is fixed at at least one fiber structure, are connected to one another using a textile process in a shape matched manner and/or with material continuity before the hardening or complete polymerization of the matrix material.