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Confined Compression Chamber Kit, Dia 6mm

MA744

A testing chamber for biphasic material

SKU: MA744 Categories: ,

Confined compression testing measures the capacity of the material to withstand axial compressive loads without expanding perpendicularly to the force. Confined compression tests are usually performed on biphasic materials (one phase being liquid) (e.g. poroelastic materials). This chamber is made of a clear tube (internal diameter D = 6.18 mm) which allows visualization of the sample during compression. The disk-shaped sample is compressed by a sliding piston D=6.175mm and the liquid phase can be expelled through a porous disk (40 microns pore size). The kit also contains two 6-mm biopsy punches and a syringe to release the sample.

  • Designed to be used in contact with physiological saline solution
  • Easy to assemble and mount on the tester
  • Made of transparent material to facilitate assembly
Material

Polycarbonate Clear Tubing, Stainless Steel 316L (Porous Disk, Pore Size 40 microns)

Diameter

6.175 mm (internal diameter)

Upper Attachment

1/4-28 Screw

Documents and resources (3)

Test configurations (1)

FAQ

What is Poroelasticity?
Property of an elastic or viscoelastic material with an incompressible free fluid phase. When such a material is put under stress, fluid is released from the solid matrix. The frictional drag generated from the movement of the fluid through the matrix affects the mechanical behavior of such material. These materials are normally tested in a bath of fluid.

Mach-1 Analysis – Poroelastic Model in Unconfined Compression – Parameters

Mach-1 Analysis – Poroelastic Model in Confined Compression – Parameters

Mach-1 Analysis – Poroelastic Model in Confined Compression – Example

Mach-1 Analysis – Poroelastic Model in Unconfined Compression – Cartilage

Mach-1 Analysis – Poroelastic Model in Unconfined Compression – Example

LAB MODULE – Torsion of Disk-Shaped Samples – Student Version

How does the "Poroelastic Model in Confined Compression" feature works?
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).

Mach-1 Analysis – Poroelastic Model in Confined Compression – Parameters

Mach-1 Analysis – Poroelastic Model in Confined Compression – Example

What is an aggregate modulus?
The aggregate modulus (Ha) corresponds to the stiffness of the material at equilibrium when fluid has ceased flowing through it in a confined compression test configuration. The aggregate modulus can be calculated from Young's modulus (E) and the Poisson ratio (v) using the formula Ha=E(1-v)/[(1+v)(1-2v)].

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