Apparatus for clamping a test sample in a testing machine

US4821579A · kind A · utility

Assignee

• Carl Schenck AG · DE

Inventors

• Peter Gernhart · Klingenberg, DE
• Gerhart Hintz · Roßdorf, DE
• Guenter Keller · Bensberg, DE
• Andreas Pohl · Groß-Umstadt, DE

Key dates

• Filing date: Jun 16, 1988
• Grant date: Apr 18, 1989
• Expiry date: Jun 16, 2008

Classification

• Technology area (CPC G): Physics
• CPC primary: G01N2203/0623
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

In a test sample clamping apparatus for testing machines, having a clamping head or chuck and a force sensor (2) arranged on the chuck, testing forces are measured with a force sensor and displacements or test sample deformations are measured simultaneously with a light deflection. Thus, rapid test procedures such as fast tensile rupture tests are made possible. The clamping head or chuck includes a base plate (3), one side of which receives or holds clamping elements (15) and the other side of which clamps down the force sensor (2) against a support. A mirror surface (8, 8') is arranged on the base plate (3) or on other appropriate surfaces of the clamping head so as to reflect a ligth beam (10) emitted by a light source (9) onto a position detector (11). In order to measure a deformation caused displacement of the clamping head and correspondingly of the test sample (4), an electronic evaluating circuit (12) evaluates the position dependent output signal of the detector (11).