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  Technical papers relevant to GDS systems with many available for download as pdf.  
   
     
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  Both hardware and software videos designed for use by both existing customers and potential customers.  
   
 
 
Hollow Cylinder (GDSHCA)
 
What is it?
 
The GDS Small-Strain Hollow Cylinder Apparatus (SS-HCA) allows for rotational displacement and torque to be applied to a hollow cylindrical specimen of soil. Using this device it is possible to control the magnitude and direction of the three
principal stresses. Studies can for example be made of the following:
  • The anisotropy of soil samples.
  • The effects of principal stress rotation.
  • The effects of intermediate principal stress.
 
Hollow Cylinder soil testing system (GDSHCA)
  Download full specification datasheet as pdf [257kb]
  GDSLAB software for GDSHCA video introduction click here...
 
 
What are its uses
 
The GDS SS-HCA can apply a uniquely wide range of stress paths on the test specimen. The loading systems are computer controlled and strains can be measured directly on the test specimen. These strains can also be servo-controlled. Studies can therefore be made under the following test conditions:
  • Plane strain.
  • Simple shear.
  • Very small shear strain.

Two versions of the SS-HCA are available, a dynamic (SSHCA d) and a lower cost "static" (SS-HCA s) version. The SSHCA d has been developed to be a complete dynamic hollow
cylinder apparatus (dynamic axial and rotational axes) at a price approaching that of a standard dynamic triaxial system.

 
 
 
GDS Instruments is an ISO 9001:2000 credited company.