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Mach-1 Motion Software – Ajout pour l’indentation normale

MA724

Active la fonction d’indentation normale

UGS : MA724 Catégories: ,

(En anglais seulement) This function precisely detects the height and orientation of the surface at the XY position and records the load (for multiaxial load cell only) while simultaneously moving the three linear stages at different speeds in order to move a spherical indenter with a predefined displacement profile along a virtual axis normal to the surface of the sample.

  • Équipé de logiciels intuitifs permettant la collecte efficace des données et des analyse simplifiées

Documents et ressources (2)

Configurations de test (1)

FAQ

Comment fonctionne la fonctionnalité "Interfaces Detection with Needle Probe"?

(En anglais seulement) This tool allows for the computing and visualizing of the surface position (mm) and the interface position (mm) of a “Find Contact” curve (load or force vs. position) obtained from a needle probe measurement (Jurvelin et al., 1995) on a sample (Figure 1). This model is well adapted for the thickness measurement of samples composed of two layers (a soft layer on top and a stiffer layer under), for example: articular surfaces. This analysis can be used in two modes, either automatic or manual. In the automatic mode, the low-pass filter cutoff frequency and the loading limit need to be specified in order to optimize the interface detection for each different sample. A user license is required in order to obtain the results of the interfaces detection with needle probe (Software Add-On, contact Biomomentum to obtain your license).


The needle probe measurement consists of moving the needle probe at a constant speed until it penetrates the surface of the sample and stops inside the interface. The difference between the position of the surface (position where the load starts to increase) and the position of the interface (sharp increase in the load) corresponds to the vertical thickness (Figure 2).

This analysis can be done in two modes, either automatic or manual. The automatic mode allows finding the surface (1) and the interface (2) position through an algorithm.

  • In order to find the surface position (1), the algorithm will start from the maximum load and will slowly scan the curve until the load will be equal to the load at the starting point (Figure 3).
  • In order to find the interface position (2), the algorithm will first smooth the curve with a low-pass filter (red line) and will then compute the first derivative (green line) and second derivative (blue line) of the curve. The position of the maxima of the second derivative will be considered as the interface position if its position is located before the user-defined loading limit (Figure 4).

Thus, the automatic mode consists of specifying two parameters:

Low-Pass Filter Cutoff Frequency (Hz) – Defines the cutoff frequency of the low-pass filter that will smooth the curve

Loading Limit (load/sec) – The inflection position is located before this loading limit defined by the user. This loading limit varies depending on the sample used; it represents the loading limit at which the user is certain that the needle probe is in the interface.

The manual mode lets the user drag the cursors to the surface the interface positions.
For example, (Figure 5) shows parameters used for the “Find Contact” function in needle probe measurement testing protocol on ovine articular surfaces. Corresponding results are shown in (Figure 1).

Mach-1 Analysis – Détection d’interfaces avec sonde à aiguille – Paramètres

Mach-1 Analysis -Détection d’interfaces avec sonde à aiguille -Mesure d’aiguille

Mach-1 Analysis -Détection d’interfaces avec sonde d’aiguile -Interface Position

Mach-1 Analysis -Détection d’interfaces avec sonde d’aiguille – Position Surface

Mach-1 Analysis – Interfaces Detection with Needle Probe – Example

Que puis-je trouver dans le menu "Analysis"?
(En anglais seulement) The analysis menu is used to obtain several basic curve properties such as the slope, the area under the curve, minimum-maximum values, and other statistics. The analysis results are displayed in the "Results" field. The results can be copied to the clipboard by right-clicking in the "Results" field. The menu also offers advanced tools for analyzing your data and extracting relevant material properties. Some advanced analysis modules can be purchased from Biomomentum and must be installed as software add-ons. Curve fitting to advanced models (Add-ons) are displayed, but not the results.

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