Configuration de test
Aliment
Tester des aliments dans un contexte scientifique agriculturel; Pour valider la qualité des produits, l’efficacité d’un emballage, la fraîcheur des aliments, etc.
À propos de ce matériau
Tester des aliments dans un contexte scientifique agriculturel; Pour valider la qualité des produits, l’efficacité d’un emballage, la fraîcheur des aliments, etc.
Configurations de test (11)
Configuration de test
Compression Non-Confinée
Configuration de test
Indentation (Raideur)
Configuration de test
Cartographie 3D d'épaisseur
Configuration de test
Torsion
Configuration de test
Force d'expulsion ou d'aspiration
Configuration de test
Contrôle de la temperature
Configuration de test
Positionnement (manuel angulaire)
Configuration de test
Perforation
Configuration de test
Capteurs analogues externes
Configuration de test
Flux de caméra
Ressources associées (3)
FAQ
Qu'est-ce que le module d'Young E?
Propriété mécanique intrinsèque d'un matériau indépendant de sa géométrie. Correspond à la pente du stress par rapport à la contrainte pendant une compression non-confiné lorsqu'on tiens compte de la géométrie de l'échantillon.
Module de laboratoire — Compression non confinée de disques d’hydrogel
Qu'est-ce que l'allongement à la rupture?
La quantité de la déformation uniaxiale à la fracture, y compris la déformation élastique et plastique.
Comment fonctionne le modèle poroélastique en compression confinée "Poroelastic Model in Confined Compression"?
(En anglais seulement) This tool allows for the computing and visualizing of the aggregate modulus (MPa), the permeability (mm2/MPa·s) and the mean square error (RMSE) of the fit calculated from a “Stress Relaxation” curve (load or force vs. time) in confined compression (Figure 1) on a disk sample. The curve is fitted to the linear biphasic model (Mow et al., 1980 or Bursać et al., 1999) in order to obtain the mechanical properties of the disk. Sample radius, strain and sample thickness need to be specified.
This model is well adapted for the mechanical characterization of samples containing a liquid fraction and a solid matrix, for example: cartilage or gel samples. A user license is required in order to obtain the results of the poroelastic model in confined compression (Software Add-On, contact Biomomentum to obtain your license).
Mechanical properties can be obtained from the stress relaxation curves obtained under confined compression such as the aggregate modulus (HA) and the hydraulic permeability (k). The aggregate modulus is a measure of stiffness of the sample at equilibrium while the hydraulic permeability is the ability of the fluid to flow through the cartilage matrix.
For example, (Figure 2) shows parameters used for the “Stress Relaxation” function in a confined compression testing protocol on human cartilage disks. Corresponding results are shown in (Figure 1).
This model is well adapted for the mechanical characterization of samples containing a liquid fraction and a solid matrix, for example: cartilage or gel samples. A user license is required in order to obtain the results of the poroelastic model in confined compression (Software Add-On, contact Biomomentum to obtain your license).
Mechanical properties can be obtained from the stress relaxation curves obtained under confined compression such as the aggregate modulus (HA) and the hydraulic permeability (k). The aggregate modulus is a measure of stiffness of the sample at equilibrium while the hydraulic permeability is the ability of the fluid to flow through the cartilage matrix.
For example, (Figure 2) shows parameters used for the “Stress Relaxation” function in a confined compression testing protocol on human cartilage disks. Corresponding results are shown in (Figure 1).
Mach-1 Analysis – Modèle poroélastique en compression confinée – Paramètres
Mach-1 Analysis – Modèle poroélastique en compression confinée – Exemple
Comment fonctionne le modèle poroélastique en compression non-confinée "Poroelastic Model in Unconfined Compression"?
(En anglais seulement) This tool allows for the computing and visualizing of the fibril network modulus (MPa), the equilibrium modulus (MPa), the permeability (mm2/MPa·s), and the mean square error (RMSE) of the fit calculated from a “Stress Relaxation” curve (load or force vs. time) in unconfined compression (Figure 1) on a disk or osteochondral core sample. The curve is fitted to the linear fibril-network-reinforced biphasic model (Soulhat et al. 1999) in order to obtain the mechanical properties of the disk. Sample radius, strain, and Poisson’s ratio need to be specified. This model is well adapted for the mechanical description of samples containing a liquid fraction and a fibril network, for example: cartilage or gel samples. A user license is required in order to obtain the results of the poroelastic model in unconfined compression (Software Add-On, contact Biomomentum to obtain your license).
The nonhomogeneous composite model (i.e. linear fibril-network-reinforced biphasic model) is an extension of the previously developed isotropic homogeneous biphasic model, and was achieved by reinforcing the latter with a network of nonlinear fibrils distributed homogeneously in the r, θ, z directions and which resist extension only (Figure 2). The isotropic matrix is described by the drained elastic constants Em (Young’s modulus), vm(Poisson’s ratio) and a hydraulic permeability k. The fibril network is described by the Young’s modulus of individual fibrils ef which, combined with a fibril volume fraction χ (fibrils volume/ total-volume), results in an equivalent tensile modulus of the fibril network, Ef = 1/3 χ ef (since 1/3 of the fibrils are oriented in each of three mutually orthogonal directions).
For example, (Figure 3) shows parameters used for the “Stress Relaxation” function in an unconfined compression testing protocol on ovine cartilage disks. Corresponding results are shown in (Figure 1).
The nonhomogeneous composite model (i.e. linear fibril-network-reinforced biphasic model) is an extension of the previously developed isotropic homogeneous biphasic model, and was achieved by reinforcing the latter with a network of nonlinear fibrils distributed homogeneously in the r, θ, z directions and which resist extension only (Figure 2). The isotropic matrix is described by the drained elastic constants Em (Young’s modulus), vm(Poisson’s ratio) and a hydraulic permeability k. The fibril network is described by the Young’s modulus of individual fibrils ef which, combined with a fibril volume fraction χ (fibrils volume/ total-volume), results in an equivalent tensile modulus of the fibril network, Ef = 1/3 χ ef (since 1/3 of the fibrils are oriented in each of three mutually orthogonal directions).
For example, (Figure 3) shows parameters used for the “Stress Relaxation” function in an unconfined compression testing protocol on ovine cartilage disks. Corresponding results are shown in (Figure 1).
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
Comment fonctionne le modèle "Sinusoid"?
(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
Qu'est-ce que la viscoélasticité?
Propriété d'un matériau présentant des caractéristiques visqueuses et élastiques sous déformation. Un tel matériau montrera un comportement mécanique dépendant du temps.
LAB MODULE – Torsion of Disk-Shaped Samples – Student Version
Qu'est-ce que la résistance ultime à la traction (résistance à la traction)?
La résistance ultime est la contrainte maximale développée dans un matériau avant la rupture durant un test de tension.
Qu'est-ce que la limite élastique de la rigidité?
La contrainte à laquelle un matériau commence à montrer une déformation plastique.
Qu'est-ce que l'élasticité?
Propriété d'un matériau à déformer sous déformation ou contrainte et revenir à sa forme originale lorsque la contrainte est relâché.
Module de laboratoire — Torsion de l’os
LAB MODULE – Unconfined Compression of Hydrogel Disks – Student Version