Experimental investigation of the effect of surface markings on the mechanical integrity of weathering bridge steels.

Details

• Creators:
  Manuel, Michele V. ; George, Edward
• Corporate Creators:
  University of Florida
• Subject/TRT Terms:
  Bridge Construction Fatigue (Mechanics) Milling Plasma Arc Cutting Weathering Steel
• Publication/ Report Number:
  BDV31-977-02
• Resource Type:
  Tech Report
• Geographical Coverage:
  United States
• Corporate Publisher:
  Florida. Dept. of Transportation
• Abstract:
  High-strength low-alloy (HSLA) weathering steels are the conventional material used for non-redundant fracture-critical members in bridge construction. Guidelines have been put in place by state
  
  Departments of Transportation (DOTs) to prevent material suppliers from making scribe marks that
  
  will remain on the surface of fracture-critical members when in service, due to the possibility of
  
  degrading mechanical properties. Currently, any automated scribing marks allowed, namely
  
  mechanical milling, are either cut off of the member or subsequently welded over, thereby effectively
  
  removing them prior to service. All other markings are either manually die-stamped or spray-painted
  
  on. The lack of an automated capability to place markings on weathering steels slows production, and
  
  markings are often accidentally removed during sand blasting or shipping, which causes additional
  
  problems for the manufacturer and recipient. There is a need to establish safe, automated methods of
  
  scribing fracture-critical members such that markings will remain throughout the production process,
  
  but will not compromise the integrity over the lifetime of the part. Three automated techniques were of
  
  interest in this study as they are often already in the manufacturing process. These include mechanical
  
  milling, plasma scribing, and laser scribing. In this study, a microstructural evaluation of 50W
  
  weathering steel was conducted to understand and characterize the effect of the three markings on
  
  microstructural evolution and mechanical properties. Plasma scribing resulted in the most noticeable
  
  surface marking. S-N curves generated through fatigue testing showed no measurable difference in
  
  fatigue life between marked and unmarked material.
  
  
• Format:
  PDF
• Collection(s):
  US Transportation Collection
• Main Document Checksum:
  urn:sha256:1e57a7034ee9da67c736f0dba2aeca6c5f5c11959bd81c0b2b582abb16cffee3
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/28411/dot_28411_DS1.pdf
• File Type:
  [PDF - 14.38 MB ]