Continuous or instrumented indentation device with convex bearing surface and use thereof, particularly for metal sheet indentation

A measurement and continuous technology, applied in the direction of measuring devices, testing material hardness, analyzing materials, etc.

Active Publication Date: 2011-08-17
UNIV DE RENNES I
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0032] Although the flatness defect is not large, the resulting deflection will cause the displacement sensor to detect a

Method used

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  • Continuous or instrumented indentation device with convex bearing surface and use thereof, particularly for metal sheet indentation
  • Continuous or instrumented indentation device with convex bearing surface and use thereof, particularly for metal sheet indentation
  • Continuous or instrumented indentation device with convex bearing surface and use thereof, particularly for metal sheet indentation

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Embodiment Construction

[0074] Let's now refer to Figure 6A , which partially demonstrates the case of a continuous indentation device according to the invention.

[0075] The reason why the installation is only partially displayed is to focus only on the innovative aspects of the installation.

[0076] Among them, we can note that there is an indenter 10 of known type, perpendicular to the XX' axis.

[0077] In order to simplify the drawings, the mechanism that can vertically displace the pressure head from top to bottom or vice versa is not shown here.

[0078] The device is equipped with a platen 40 on which the material to be tested is placed. The platen 40 is placed on the force sensor mechanism 41 which is supported by the frame 4 in the device.

[0079] According to the present invention, on the extension line of the longitudinal axis XX' of the indenter 10, the support for the material 2 to be tested comprises a convex surface on which the material 2 is placed, facing the indenter.

[00...

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Abstract

The invention particularly relates to a so-called continuous or instrumented indentation device for a material (2), which includes: an indenter (10); a bearing means (40; 6) for the material (2) to be indented; a means for moving the indenter (10) and/or the bearing means (40; 6) for contacting said indenter (10) with said material (2) and for pressing the indenter into the material; a means (5) for measuring the force and the movement of the indenter (10) when the same is pressed into the material (2). The device is particularly characterized in that: the bearing means (40; 6) includes, as an extension of the longitudinal axis (X-X') of said indenter (10), a convex surface (6) for receiving said material (2) and oriented towards the indenter (10) so that said material (2) is capable of bearing on said surface (6) point-by-point or quasi-point-by-point; said indenter is integral, i.e. the indenter comprises an indentation tip that is made as a single piece with the body of said indenter; the means for measuring the movement of the indenter (10) when the same is pressed into the material (2) includes at least three movement sensors (5) angularly arranged at an equal distance about said indenter (10).

Description

technical field [0001] The present invention relates to a "continuous" or "instrumented" indentation device. The invention also relates to the use of the device for creasing sheet material, especially thin sheet or sheet material. Background technique [0002] "Continuous" or "measurement" indentation needs to measure the force and displacement of the indenter when the indenter is pressed into the material to be tested. [0003] See Figure 1a , where the tip of the indenter (ball with radius R) is marked as 1, and the material to be tested is marked as 2. After the tip 1 is pressed in, the material 2 is deformed, and an imprint 20 of depth h is left on the surface. [0004] Figure 1b An example of indentation curve F(h) is given in , which reflects the change of the force F according to the indentation depth h of the indenter in the material. The curve includes an applied and an unloaded phase, which depend on several test parameters as well as the mechanical propertie...

Claims

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Application Information

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IPC IPC(8): G01N3/42
CPCG01N2203/0282G01N2203/04G01N2203/0082G01N3/42
Inventor 热拉尔·莫瓦桑
Owner UNIV DE RENNES I
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