Application of the cyclic J-integral to fatigue crack propagation of Al 2024-T351

Leslie Banks-Sills*, Yehuda Volpert

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


In this investigation, an experimental/numerical study of the cyclic J-integral, ΔJ, is carried out in order to more clearly explain the meaning of this parameter for fatigue crack growth studies. Constant amplitude fatigue tests with two R-ratios (R ≅ 0.05 and R ≅ 0.5) are performed on compact tension specimens fabricated from Al 2024-T351. A simulation of tests is carried out numerically by means of the finite element method with the material modeled to be elasto-plastic. From the numerical results, values of ΔJ are calculated from both a path independent integral and load vs load-line displacement data. Comparisons between these values, as well as to those determined from experimental data, are seen to be reasonable. The parameter ΔJ, is seen to properly correlate the crack growth rate under elastic and small scale yielding conditions.

Original languageEnglish
Pages (from-to)355-370
Number of pages16
JournalEngineering Fracture Mechanics
Issue number2
StatePublished - 1991


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