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            Analysis of Impact Energy to Fracture Unnotched Charpy Specimens Made From Railroad Tank Car Steel
      

      
  Document Series
              Other Reports


      
  Author
          VOLPE


      
Report Number
              RTDF2007-46038

  Office
              RRD


      Subject
                    Hazardous Materials


      
  Keywords
              Analysis of Impact Energy to Fracture Unnotched Charpy Specimens Made From Railroad Tank Car Steel


      

      
      
              
                  
      
              
  Document
              asme_rtdf2007_46038.pdf (439.91 KB)

      
              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.
      
            
      
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              Last updated: Tuesday, September 11, 2007 U.S. DEPARTMENT OF TRANSPORTATION

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