Analysis of impact energy to fracture un-notched charpy specimens made from railroad tank car steel

Details

• Alternative Title:
  Proceedings of the 2007 ASME Rail Transportation Division Fall Technical Conference ; RTDF2007
• Creators:
  Yu, H. ; Jeong, D.Y. ; Gordon, J E ; Tang, Y.H.
• Corporate Creators:
  John A. Volpe National Transportation Systems Center (U.S.)
• Subject/TRT Terms:
  Deformation Failure Analysis Finite Element Method Fracture Tests Impact Tests Pendulum Tests Railroad Safety Structural Analysis Tank Cars
• Publication/ Report Number:
  RTDF2007-46038
• Resource Type:
  Proceedings
• Geographical Coverage:
  United States
• NTL Classification:
  NTL-RAIL TRANSPORTATION-RAIL TRANSPORTATION ; NTL-RAIL TRANSPORTATION-Rail Safety ; NTL-SAFETY AND SECURITY-Rail Safety ; NTL-SAFETY AND SECURITY-Vehicle Design
• Abstract:
  This paper describes a nonlinear finite element analysis
  
  (FEA) framework that examines the impact energy to fracture
  
  unnotched Charpy specimens by an oversized, nonstandard
  
  pendulum impactor called the Bulk Fracture Charpy Machine
  
  (BFCM). The specimens are made from railroad tank car steel,
  
  have different thicknesses and interact with impact tups with
  
  different sharpness. The FEA employs a Ramberg-Osgood
  
  equation for plastic deformations. Progressive damage and
  
  failure modeling is applied to predict initiation and evolution of
  
  fracture and ultimate material failure. Two types of fracture
  
  initiation criterion, i.e., the constant equivalent strain criterion
  
  and the stress triaxiality dependent equivalent strain criterion,
  
  are compared in material modeling. The impact energy needed
  
  to fracture a BFCM specimen is calculated from the FEA.
  
  Comparisons with the test data show that the FEA results
  
  obtained using the stress triaxiality dependent fracture criterion
  
  are in excellent agreement with the BFCM test data.
  
  
• Format:
  PDF
• Collection(s):
  Volpe Center
• Main Document Checksum:
  urn:sha256:f02dd563d16354044499f4e93286a8cdf525feea1530c3bc6fdb451a966b61ea
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/9907/dot_9907_DS1.pdf
• File Type:
  [PDF - 439.91 KB ]