Fatigue and Fracture Mechanics, Volume 37: by Sreeramesh Kalluri; Michael A. McGaw; Andrzej Neimitz

By Sreeramesh Kalluri; Michael A. McGaw; Andrzej Neimitz

Thirty-nine peer-reviewed papers give you the most recent examine on fatigue and fracture mechanics. subject matters disguise:

  • Advanced grasp Curve techniques to the EURO fracture durability info set
  • Analysis of fracture mechanisms of ferritic steels at low temperatures
  • Weibull pressure version to foretell results of weld energy mismatch on cleavage fracture toughness
  • Non neighborhood multiaxial fatigue method of account for pressure gradient impact on fatigue strength
  • Effects of microstructure on incipient fatigue and fretting crack techniques in Al-Cu-Li alloys
  • Importance of residual stresses and floor roughness concerning fatigue of titanium forgings
  • Fatigue crack progress simulation in elements with random defects
  • Fatigue initiation modeling of 316LN metal in line with non neighborhood plasticity theory
  • Temperature calibration concepts for TMF testing
  • Residual pressure results on bridging tension of cracked and delaminated fiber steel laminates
  • Assessment of cumulative axial and torsional fatigue in a cobalt-base superalloy
  • And a lot more!
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    Fracture toughness in terms of Jc is shown in Fig. 21͑a͒ for the non-irradiated material. Since cleavage fracture is known to originate at a single point in the material, intensive fractography was carried out, which revealed indeed the existence of isolated locations on the fracture surface from where cleavage fracture spread all over the fracture surface. These locations observed on 25 C͑T͒ specimens tested between −55 and −90° C are compiled in Fig. 21͑b͒. It is clearly seen that their positions, rc, ahead of the crack front vary within a wide range, which indicates that also several amounts of ductile tearing are needed to reach the weak points further ahead of the crack front.

    20—Experimental and, with Eqs 35 and 36, estimated initiation values of K for ductile tearing, data from Ref 36. clear that such models can never be used to “predict” fracture toughness; however, they show how the various basic material parameters affect the result, and what could be done to improve the toughness of a specific material. Material data for validation of the three models can be found in Ref 36. It should be noted that the above derivations done in the framework of linear elastic fracture mechanics could be easily converted to elastic-plastic parameters such as the J-integral.

    The aim of the investigation was not to determine the transferability of an R-curve from specimen to component; the aim was rather to check the ability of the ETM to estimate the deformation and fracture behavior of the large scale pipes. A study on internally pressurized cylinders ͓69͔ yielded also promising results. A thin-walled cylinder with a through-crack tested at TWI, Cambridge ͓70͔, was equipped with CTOD gages at both crack tips. The ETM estimates ͑Fig. 37͒ compare reasonably well with the pressure-CTOD record as averaged for both crack tips.

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    Fatigue and Fracture Mechanics, Volume 37: by Sreeramesh Kalluri; Michael A. McGaw; Andrzej Neimitz
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