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Stress in Motion Pad (SIM) System
 

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Tire/road interface stresses are those induced by vehicular traffic running on roads, and are the primary cause of surfacing problems.

Since the cost of asphalt layers is often the most significant in road construction and maintenance works, designing towards an optimum asphalt layer thickness in relation to the supporting road structure, and the expected axle loading and tire pressures, is therefore of great importance.

   
 
CSIR Transportek has developed a unique system that simultaneously measures the vertical, transverse and longitudinal vehicle tire/road interface stresses under a moving wheel load.

Stress-in-Motion screenshot
Click to enlarge

This technology, dubbed Stress-in-Motion (SIM), provides some of the most important inputs into pavement design for optimising the cost of roads over their design life. 
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The SIM pad is used to measure tire/road interface stresses under a moving wheel load.
The SIM pad is used to measure tire/road interface stresses under a moving wheel load.

 

The Stress-in-Motion pad.
The Stress-in-Motion pad.
(vehicle road surface transducer array).

  
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  The SIM system has been developed since the early 1990s and an industrialized version is now available.
As part of pavement research it is being introduced into vehicle monitoring stations in South Africa.
SIM technology is available for specific client-defined measurement programs or as a complete system for the client.		   The SIM pad has been used with the HVS and results indicate that under normal conditions the maximum vertical stress is in the tire center, exceeding the inflation pressure by up to 30% and in extreme cases, the bias (cross) ply tire side wall vertical stresses can be twice as high as the tyre inflation pressure with maximum transverse stresses up to 70% of the inflation pressure.  
         
         
 

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Download brochures in PDF format for printing.
 Download Stress-in Motion.pdf (179 Kb)

 
 

 

  
  For further product information: Please mail to: EquipmentSales@dynatest.com  
  Dynatest  

Dynatest International A/S
rev.040101-10

  

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