Configurations de test
(En anglais seulement) The unconfined compression test is by far the most popular mechanical testing configuration to measure the mechanical properties of cylindrical-shaped samples. Sample with other geometry can also be tested using this configuration, but data analysis requires complex theoretical modelling to extract the mechanical parameters. A disk sample is compressed between two flat platens free to expand in the radial direction (slipping boundary conditions). This test configuration is normally performed under displacement control. For simple elastic material, taking into account the geometry of the sample (radius and thickness), the slope of the stress vs deformation curve is used to calculate the Young’s modulus. For material showing more complex mechanical behavior (e.g. viscoelastic or poroelastic material), advanced theoretical models can be used to assess specific mechanical parameters (e.g. relaxation rate, permeability, matrix modulus, fibril modulus, etc.).
Voir : Module de laboratoire — Compression non confinée de disques d’hydrogelLab Modules · 8 chapitres · 24:37
Préparez les échantillons de caoutchouc et d’hydrogel, réalisez les essais de compression et analysez les résultats.
Module de laboratoire — Compression non confinée de disques d’hydrogel
Mach-1 Analysis – Modèle poroélastique en compression non-confinée – Paramètres
Mach-1 Analysis – Modèle poroélastique en compression confinée – Paramètres
Mach-1 Analysis – Modèle poroélastique en compression confinée – Exemple
Mach-1 Analysis – Modèle poroélastique en compression non-confinée – Cartilage
Mach-1 Analysis – Modèle poroélastique en compression non-confinée – Exemple
LAB MODULE – Torsion of Disk-Shaped Samples – Student Version
Module de laboratoire — Torsion de l’os
Module de laboratoire — Torsion d’échantillons en forme de disque
LAB MODULE – Torsion of Bone – Student Version
LAB MODULE – Torsion of Disk-Shaped Samples – Student Version
Module de laboratoire — Torsion de l’os
Module de laboratoire — Torsion d’échantillons en forme de disque
LAB MODULE – Torsion of Bone – Student Version
LAB MODULE – Torsion of Disk-Shaped Samples – Student Version
Mach-1 Analysis – Modèle élastique sur échantillon sphérique – paramètres
Mach-1 Analysis – Modèle élastique sur échantillon sphérique – Equation
Mach-1 Analysis – Modèle élastique sur échantillon sphérique – Exemple
Mach-1 Analysis – Modèle poroélastique en compression non-confinée – Paramètres
Mach-1 Analysis – Modèle poroélastique en compression non-confinée – Cartilage
Mach-1 Analysis – Modèle poroélastique en compression non-confinée – Exemple
(En anglais seulement) This feature is used to obtain the Frequency, Amplitude and Offset of a sinusoidal signal. A blue line displays the theoretical sinusoid with the Frequency, Amplitude and Offset obtained (Figure 1). The values of the Frequency, Amplitude and Offset are indicated in the "Results" field. The units vary according to the graph’s axes.
This feature can also be used for sinusoidal stimulus-response analysis. Sinusoidal stimulus shall be selected on the x-axis and the sinusoidal response on the y-axis. The Modulus is the ratio of the response Amplitude over the stimulus Amplitude. The Phase is the phase difference between the response and the stimulus. The Modulus’ is computed as the Modulus*Cos(Phase) and the Modulus” is computed as the Modulus*Sin(Phase). A blue line displays the theoretical sinusoidal stimulus-response with the Frequency, Modulus and Phase obtained (Figure 2). The values of the Modulus and Phase are indicated in the “Results” field. The units vary according to the graph’s axes.
One use for this feature would be to compute material properties by multiplying the Modulus obtained by the appropriate geometric factors. For example, the Young’s Modulus can be obtained during uniaxial compression or tension on cylindrical sample with t/pi*r2 as the geometric factor, t is the thickness and r is the radius of the sample.
Mach-1 Analysis – Sinusoid – Exemple d’analyse stimulus-réponse
Mach-1 Motion – Fenêtre de la fonction Stress Relaxation
Mach-1 Motion-Stress Relaxation-Position typique en fonction de la courbe de tem
(En anglais seulement) The Find Contact function moves a stage until a predefined load variation (stop criteria) is measured by the load cell, then it analyses the load-displacement curve and repositions the stage based on the selected stage repositioning option. This function can be used, for example, to detect the exact location of a sample surface or the bottom of a testing chamber (in this case the stage must be moved very slowly to avoid overloading the load cell), or to place an indenter in contact with a sample using a predefined load.
Mach-1 – Exemple de données brutes (Image Sin 2mm 0.2Hz 5cycles)
Mach-1 – Exemple de données brutes (Image of Sin 2mm 0.1Hz 5cycles)
LAB MODULE – Torsion of Disk-Shaped Samples – Student Version
Module de laboratoire — Torsion de l’os
LAB MODULE – Unconfined Compression of Hydrogel Disks – Student Version
Module de laboratoire — Compression non confinée de disques d’hydrogel
