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

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  • English

  • Details:

    • Alternative Title:
      Proceedings of the 2007 ASME Rail Transportation Division Fall Technical Conference ; RTDF2007 ;
    • Publication/ Report Number:
    • Resource Type:
    • Geographical Coverage:
    • 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.

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