Predicting the dynamic fracture of steel via a non-local strain-energy density failure criterion.

Details

• Creators:
  Schrum, Kevin D. ; Sicking, Dean L. ; Faller, Ronald K. ; Reid, John D.
• Corporate Creators:
  Midwest Roadside Safety Facility
• Corporate Contributors:
  United States. Federal Highway Administration ; Nebraska. Dept. of Roads
• Subject/TRT Terms:
  • Fracture mechanics
  • Steel
  • Dynamic loads
  • Strain (Mechanics)
  • Tension tests
  • Failure
• Publication/ Report Number:
  TRP-03-311-14
• Resource Type:
  Tech Report
• Geographical Coverage:
  United States
• Corporate Publisher:
  Nebraska Transportation Center
• Abstract:
  Predicting the onset of fracture in a material subjected to dynamic loading conditions has typically been heavily mesh-dependent, and often must be specifically calibrated for each geometric design. This can lead to costly models and even ; costlier physical testing. In response to this, a failure criterion was created based on the strain energy density (SED) of the ; material. Calculations to obtain the SED were developed to take advantage of a non-local length scale, wherein the sensitivity ; to mesh density was partially reduced. This method was applied to a steel coupon subjected to dynamic uniaxial tension. A ; one-time calibration was used to determine the material’s critical SED in the non-local length scale. This length scale was ; dependent on the mesh density of the model and a prescribed magnifier, such that the failure criterion was a function of the ; length scale. Steel coupons were modeled and tested dynamically. Thicknesses of those coupons were varied and stress ; concentrations were included. Differing grades of steel were also employed. The non-local SED failure criterion provided ; consistent and accurate predictions, regardless of the changes in dimensions of the coupons.
• Format:
  PDF
• Funding:
  NDOR DPS-STWD (118)
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/28375/dot_28375_DS1.pdf
• File Type:
  [PDF - 14.40 MB]
• Collection(s):
  US Transportation Collection
• Main Document Checksum:
  urn:sha-512:1e68dcc1b1df73af3d3fcc97a1d1c18f6711555eb9b61d2cc2cf69f012fd29f3080a829f9a13db88676d951be266d3093e482684794de7ead25a8f4be43bdcaf