Device for low-vibration force measurement in rapid dynamic tensile experiments on material samples

• US 20050087023A1
• Filed: 01/17/2003
• Published: 04/28/2005
• Est. Priority Date: 01/18/2002
• Status: Active Grant

• Current Assignee: Fraunhofer Gesellschaft Zur Foerderung Der Angewandten Forsching E.V.
• Original Assignee: Fraunhofer Gesellschaft Zur Foerderung Der Angewandten Forsching E.V.
• Inventors: Bohme, Wolfgang, Hug, Manfred
• Granted Patent: US 7,131,340 B2
• Time in Patent Office: Days
• US Class Current: 73/826
• CPC Class Codes: G01N 2203/001 Impulsive
• CPC Class Codes: G01N 2203/0016 Tensile or compressive
• CPC Class Codes: G01N 2203/0051 Piezoelectric means
• CPC Class Codes: G01N 2203/0423 using screws
• CPC Class Codes: G01N 2203/0482 comprising sensing means
• CPC Class Codes: G01N 2203/0623 using piezoelectric gauges
• CPC Class Codes: G01N 3/04 Chucks
• CPC Class Codes: G01N 3/30 by applying a single impulsive force, e.g. by falling weight

Abstract

A device for force measurement in dynamic tensile experiments on material samples is disclosed, comprising a force measurement cell in which at least one force measurement sensor is integrated. The invention is characterised in that the force measurement cell is embodied with at least one one-piece connecting structure, whereby the material sample may be detachably fixed to the force measurement cell by means of the connecting structure and the at least one force measurement sensor is arranged on the force measurement cell at a distance from the connecting structure.

Claims

1. A device for force measurement in dynamic tensile experiments on material samples, comprising a force measuring cell, in which at least one force measuring sensor is integrated and which is executed one piece with a first connecting structure, with the material sample being connectable in a firm, detachable manner via said connecting structure with said force measuring cell, which is provided with a second connecting structure, which is disposed opposite said first connecting structure and via which said force measuring cell is attachable to a fixed back-rest

wherein at least two force measuring sensors are disposed on said force measuring cell spaced from said first connecting structure in such a manner that the distance between said at least two force measuring sensors and said first connecting structure, and thus between the former and the tensile sample, is smaller than the distance between said at least two force measuring sensors and said second connecting structure,

said force measuring cell is provided with a housing or with two pressure plates, which has, respectively have, a thinner wall thickness in the region of said force measuring sensors than in the other housing region or other regions of said pressure plates, and

said force measuring cell has more a stable type of construction regarding elastic deformability in the region of said second connecting structure than in the region of said first connecting structure and said at least two force measuring sensors.

2. The device according to claim 1,

wherein said connecting structure is a screw connection, having provided on said force measuring cell a thread contour into which a counter thread provided on the material sample is insert able in a firm, detachable manner.

3. The device according to claim 1,

wherein said connecting structure is a flange or bolt connection, and on the material sample a corresponding counter flange is provided, respectively a connecting contour corresponding to said bolt connection.

4. The device according to claim 1,

wherein said two pressure plates of said force measuring cell can be pressed against each other by means of firm, detachable pressure means

the tensile sample can be pressed between said pressure plates with force, and

said at least one force measuring sensor is disposed on said pressure plates at a distance from said pressure means.

5. The device according to claim 1,

wherein said housing is designed axially symmetrical to a axis of symmetry along which the tensile force acts on said force measuring cell via said material sample.

6. The device according to claim 5,

wherein said at least two force measuring sensors are applied on said housing in a symmetrical arrangement relative to said axis of symmetry.

7. The device according to claim 1,

wherein said force measuring cell contains titanium.