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The design and performance of a membrane-piston, high-pressure (σ2 − σ3 ≦ 300 MN/m2) cell are presented. This device is similar to the one used for standard triaxial tests differing only in the stresses, σ2 and σ3, which are independently applied through flexible polyvinyl chloride (PVC) fluid cushions on prismatic specimens. The cell has been used extensively for monotonic-cyclic, compression-tension, plane strain-plane stress tests on a variety of materials.
The design and construction of a similar cell, which fulfills different requirements, are also presented. It uses flexible fluid cushions to transmit pressures up to 250 MN/m2 for σ1, and fluid cushions and fluid chamber pressure for stresses σ2 and σ3, respectively. It transmits uniform boundary loading to large specimen surfaces (19 by 19 by 19 cm), allowing both the development of unrestrained large deformation and its reliable measurement at several locations. The cell possesses a substantial degree of experimental flexibility for testing isotropic and anisotropic materials under drained and undrained conditions as well as ease of assembly and dismantling.
multiaxial test cell, direct tensile apparatus, triaxial test, soil test, combined tension compession, stress-strain curves, mechanical properties
Director, Institute of Mechanics and Geostructures S.A., Chalandri,