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True Triaxial Test System - Mindex Ltd UK

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True Triaxial Test SystemThe integrated True-Triaxial Test Cell Platen and Seal System is designed for large strain deformation (4% to 8%) and to date has been built to accommodate 80mm cube and 80x160mm prism samples.

Designs have been produced to a accommodate a 240mm cube The unique three element Seal System compensates for the large movements whilst maintaining a gas tight seal between the TTSCP Test Rig containment pressure vessel and the cube/prism under testing.

1. Axial "Telescopic" Anti-Extrusion Rods in Engineering Plastic
2. Soft Deformable rubber - 12 Off 3d Mitred Strips
3. Flexible Rubber Integrally Bonded To Stress Support Platen The platens of the TTT cell are made of two elements:

1. Stress support platens made in high tensile stainless steel (17/4-PH Condition H1150) to spread the applied load by the 3D hydraulic jack system)
2. Interposing sample platens made in aluminium alloy (6082 -T6) for Modulus compliance and for interchange-ability in case of damage during the testing

The six platens of the test cell are held together by precision machined "L" elements using ISO 12.9 M5 button head socket head fasteners which can be backed out during 3D straining. The X2, Y2 and Z2 platens were also fitted with sliding spherically seated plates made in hard tool steel. This was incorporated to compensate for a potential skewing of the loading by the original three-jacks on three faces (X1, Y1 and Z1) only of the test specimens.

The spherical seats were incorporated to allow tilting of the X1/X2 and Y1/Y2 platen sets due to the pressure drop between Z1 and Z2 platens during permeability determinations

Auxiliary stool with Z2 platen mounted. Enlarged view of SE2/SE1 strip insertion in X2/Y2 edge of test cell.
   
   
View of X2/Y2/Z2 SE1 3D mitred corner at zero strain in all three orthogonal directions. Z1 platen opened.
 
 
 
 
 
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