Tensile Test and Stress-Strain Behavior of Steel Material from a More Than Century Old Railroad Bridge

Majority of the railroad bridges currently in service in the United States, especially in New England, were build more than a century ago. It is imperative to determine their current material conditions and estimate future behavior to ensure public safety. This paper presents the current status of the material properties from Devon bridge in Connecticut. Tensile tests were conducted in accordance with ASTM E8-16 standard to determine the Modulus of Elasticity, yield point, elongation, and ultimate tensile strength. Out of five tensile test specimens from Devon bridge, one was monotonically loaded to failure, and the remaining test samples were loaded and unloaded in their respective elastic and yield regions at different testing strain rates, and finally through the failure. This was done to evaluate the linear elastic region, potential effect of different strain rates on the sample, and to determine the parameters to conduct fatigue test. The strength hardening was observed, and yield elongation point was not observed after reaching the plastic region. The material has maintained their elastic, yielding, plastic deformation, and strength hardening characteristics. From the current testing of limited number of specimens, the results as shown that the material has maintained its ultimate tensile strength, and mechanical behavior in comparison to ASTM A7 material specifications.

Language

  • English

Media Info

  • Media Type: Digital/other
  • Features: Figures; Photos; References; Tables;
  • Pagination: 8p

Subject/Index Terms

Filing Info

  • Accession Number: 01763541
  • Record Type: Publication
  • Report/Paper Numbers: TRBAM-21-03571
  • Files: TRIS, TRB, ATRI
  • Created Date: Dec 23 2020 11:04AM