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Engineering Analysis of the Warm Prestressing (WPS) Effect: Influence of Stress-Strain Curve, Specimen Size and WPS Level

[+] Author Affiliations
Jiri Novak

Nuclear Research Institute Rez plc, Rez, Czech Republic

Paper No. PVP2006-ICPVT-11-93114, pp. 455-460; 6 pages
doi:10.1115/PVP2006-ICPVT-11-93114
From:
  • ASME 2006 Pressure Vessels and Piping/ICPVT-11 Conference
  • Volume 3: Design and Analysis
  • Vancouver, BC, Canada, July 23–27, 2006
  • Conference Sponsors: Pressure Vessels and Piping Division
  • ISBN: 0-7918-4754-3 | eISBN: 0-7918-3782-3
  • Copyright © 2006 by ASME

abstract

Under WPS effect is understood ratio of stress intensity factor at fracture after WPS (Kfr ) and the “usual” fracture toughness KIc . Theoretical models of WPS effects were derived for Small Scale Yielding (SSY) conditions. For comparison of experimental results with theory, classical Chell model was chosen: real Kfrexper is compared with predicted KfrChell . For characterization of pre-stress level in case of small specimens, it is convenient to use elastoplastic quantity KJWPS corrected to the equivalent KJWPS in SSY conditions; this quantity is denoted by symbol KJWPS(SSY) . For material with certain stress-strain curve σ = f(ε), universal dependence of Kfrexper /KfrChell on KJWPS(SSY) was obtained, which describes behaviour of specimens of different sizes. If another stress-strain curve has the same shape (i.e. if σ = const.f(ε)), KIcfrexper /KfrChell lies (up to the accuracy of experiments) on the universal dependence curve Kfrexper /KfrChell vs. KJWPS(SSY) /σy , where KJWPS(SSY) /σy is a quantity proportional to the square root of the plastified zone size in SSY conditions. Different stress-strain curve shapes lead to smaller or greater Kfrexper /KfrChell . Stress-strain curves cannot be generally expressed by power law hardening, but the Curry-Smith model derived with the use of Ramberg-Osgood law qualitatively predicts the increase or decrease of Kfr in dependence on the strain hardening exponent.

Copyright © 2006 by ASME

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