Development of a model for the ice scraping process.

Details

• Creators:
  Nixon, W.A. ; Gawronski, T.J. ; Whelan, A.E.
• Corporate Creators:
  Iowa Institute of Hydraulic Research
• Corporate Contributors:
  Iowa. Dept. of Transportation
• Subject/TRT Terms:
  Anti-icing Deicing Machinery Maintenance Road Machinery--Testing Roads--Maintenance And Repair--Equipment And Supplies--Testing Roads--Snow And Ice Control--Equipment And Supplies--Testing Snow And Ice Control Snow Removal
• Publication/ Report Number:
  IIHR Technical Report No. 383
• Resource Type:
  Tech Report
• Geographical Coverage:
  Iowa
• Edition:
  Final report.
• Corporate Publisher:
  Iowa Institute of Hydraulic Research
• Abstract:
  A laboratory study has been conducted with two aims in mind. The first goal was
  
  to develop a description of how a cutting edge scrapes ice from the road surface. The
  
  second goal was to investigate the extent, if any, to which serrated blades were better than
  
  un-serrated or "classical" blades at ice removal.
  
  The tests were conducted in the Ice Research Laboratory at the Iowa Institute of
  
  Hydraulic Research of the University of Iowa. A specialized testing machine, with a
  
  hydraulic ram capable of attaining scraping velocities of up to 30 m.p.h. was used in the
  
  testing.
  
  In order to determine the ice scraping process, the effects of scraping velocity, ice
  
  thickness, and blade geometry on the ice scraping forces were determined. Higher ice
  
  thickness lead to greater ice chipping (as opposed to pulverization at lower thicknesses)
  
  and thus lower loads. S~milabr ehavior was observed at higher velocities. The study of
  
  blade geometry included the effect of rake angle, clearance angle, and flat width. The
  
  latter were found to be particularly important in developing a clear picture of the scraping
  
  process. As clearance angle decreases and flat width increases, the scraping loads show a
  
  marked increase, due to the need to re-compress pulverized ice fragments.
  
  The effect of serrations was to decrease the scraping forces. However, for the
  
  coarsest serrated blades (with the widest teeth and gaps) the quantity of ice removed was
  
  significantly less than for a classical blade. Finer serrations appear to be able to match the
  
  ice removal of classical blades at lower scraping loads. Thus, one of the
  
  recommendations of this study is to examine the use of serrated blades in the field.
  
  Preliminary work (by Nixon and Potter, 1996) suggests such work will be fruitful.
  
  A second and perhaps more challenging result of the study is that chipping of ice
  
  is more preferable to pulverization of the ice. How such chipping can be forced to occur
  
  is at present an open question.
  
  
• Format:
  PDF
• Collection(s):
  US Transportation Collection
• Main Document Checksum:
  urn:sha256:8f2d9fead5ee683cc506394abe91fa9f5f1e657794ecc5efc675045be7ba46f9
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/23346/dot_23346_DS1.pdf
• File Type:
  [PDF - 1.43 MB ]