PSI - Issue 2_A

Haydar Dirik et al. / Procedia Structural Integrity 2 (2016) 3073–3080 Haydar Dirik and Tuncay Yalçinkaya / Structural Integrity Procedia 00 (2016) 000–000

3080

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4. Conclusion

In this study, the developed XFEM-based procedure for fatigue crack growth under VAL is verified with experi mental results on 7075 T6 aluminum center cracked specimen. The comparison of developed procedure reveals good agreement with the analytical and experimental results. Implementation of a retardation model to the XFEM-based automatized crack growth procedure to account for load sequence e ff ect is a new contribution to the literature. Prop agating the crack in a stepwise manner gives more control and the analysis possibility to the user unlike ABAQUS self-crack propagation simulation by using XFEM. Moreover, since it not needed to propagate crack at every load cy cle there is a substantial increase in the computational e ffi ciency. The obtained accuracy of XFEM in predicting FCG under VAL in an automated scheme gives the users the confidence to apply the methodology at industrial components in the near future.

5. Acknowledgements

The authors greatly acknowledge Eyüp Evren Tas¸kınog˘ lu and Fatih Özbakıs¸ from Turkish Aerospace Industries (TAI) for providing valuable inputs for this work.

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