Advanced Motor Systems
Micro-stepper & servo-electronic motor systems offer high-speed and precise loading
Description
The cyclic direct simple shear test method measures cyclic strength, number of cycles to liquefaction or cyclic properties of soils such as Modulus and Damping. A specimen is placed in a membrane within a stack of Teflon coated rings preventing radial deformation while allowing vertical deformation during consolidation and shear deformation during simple shear. Constant volume conditions are maintained during shear by keeping the height of the specimen constant as the specimen is sheared back and forth in cyclic loading.
Common testing applications include earthquake engineering and ocean wave loading. Post-cyclic monotonic strength can be measured as well.
Common testing applications include earthquake engineering and ocean wave loading. Post-cyclic monotonic strength can be measured as well.
Frequently Asked Questions
The Cyclic DSS system on the ShearTrac II frame can be purchased with either a micro-stepper motor system or an advanced zero-backlash servo actuation system to apply horizontal shear force and displacement to the soil specimen. The micro-stepper motor system is best for users wishing to perform both slow and high-speed (up to 1 Hz) shear applications – e.g. direct shear, static direct simple shear, and cyclic direct simple shear. The advanced zero-backlash servo actuation system is best when premium cyclic performance is desired (up to 5 Hz). This system can also be used for static applications, but not up to the same capacity as the micro-stepper motor system.
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