Item TF-0C4I2GI
Resonant Column
Versatile: Resonant column and cyclic torsional shear devices are combined into a single device allowing you to determine the following:.
MeetsASTM D4015
Technical specifications
| Maximum torque | 1.5 Nm |
|---|---|
| Maximum angular deformation | 10° |
| Maximum cell and back pressure | 1 MPa. |
| Excitation frequency | Dynamic (RC) 1-300 Hz; Cyclic (TS) from 0 to 50 Hz maximum |
| Dimension | Control Box 51×45 x 35 cm (h x w x d); Cell 55 cm x 27 cm (h x diam.) |
| Weight | approx. 50 kg |
Technical notes
- 10 channels signal conditioning unit
- USB data acquisition and signal generation board
- Two electro-pneumatic converters for cell and back pressure
Features
- – Maximum torque: 1.5 Nm – Maximum angular deformation: 10° – Maximum confining pressure: 1000 kPa – Maximum sample size: 50 mm diameter x 110 mm height
- RC: damping ratio from half power bandwidth, free vibration data and white noise
- TSS: damping ratio from hysteresis loops
- A cylindrical soil specimen is restrained at the base and dynamically excited at the top by means of an electrical motor generating torsional forces via eight drive coils encircling four magnets attached to a drive plate at frequencies of up to 300 Hz
- The fundamental mode of vibration is determined from the maximum amplitude of motion. Following test standard ASTM D4015, resonant frequency, shear wave velocity and shear wave modulus are calculated using elasticity theory.
- The corresponding shear strain is evaluated from the motion amplitude. Material damping can be determined from the half-power bandwidth or from a free-vibration decay curve, which is generated by shutting off the driving power.
- In the Torsional Shear test, the soil specimen is deformed cyclically at a low frequency (a maximum of 10 Hz), whilst continuously monitoring torque and deformation.
- From the torque-deformation curves, a relationship between average shear stress and average shear strain is obtained, which in turn provides the shear modulus and the damping ratio.
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- In the frequency domain, from the complete frequency response of the soil specimen (half-power bandwidth)
- In the time domain, from free-vibration decay curve that is generated by shutting off the driving power (logarithmic decrement method).
- Wykeham Farrance’s Resonant Column is a versatile system that combines Resonant Column and torsional shear tests into one convenient device for evaluating Shear Modulus and Damping Ratio. It includes:
- current-driven motor that applies torsional load to the sample
- a series of transducers with signal conditioning
- cell and back pressure electro-pneumatic control system
- data logger.
Included
| pre-installed intuitive Windows-based software allows you to perform various stages: saturation, isotropic consolidation, resonant frequency and torsional shear |
| pre-installed intuitive Windows-based software that allows you to perform both Resonant Column and Torsional Shear tests |
Ordering information
| 31-WF8600 | Resonant Column — Combined resonant column and torsional shear device for the automatic determination of damping ratio from half power bandwidth and free vibration decay method. 110-220V, 60-50 Hz, 1 ph |
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