PSI - Issue 28

Behzad V. Farahani et al. / Procedia Structural Integrity 28 (2020) 218–225 Behzad V. Farahani et al./ Structural Integrity Procedia 00 (2019) 000–000

224

7

1. The predicted stress dead-zone region revealed a minor strain value, which supports the stress dead-zone hypothesis, carried out by experimental Digital Image Correlation (DIC) and numerical Finite Element Method (FEM). 2. The geometry of the stress dead-zone region, which has been previously characterised, was verified through DIC and FEM. 3. Encouraging SIFs have been obtained through all numerical, experimental and proposed stress dead-zone notation compared to a reference solution with an acceptable deviation around 3%. 4. In accordance with the Griffith’s theory, the longitudinal strain trend experienced a descending rate in terms of the distance to the notch tip via a straight path defined after the tip. 5. The stress dead-zone concept represents an alternative analytical method leading to the evaluation of the SIFs on generally oriented cracks in flat plates without the necessity of advanced mathematical tools bearing on structural singularity modelling. In fact, the major innovation is associated with a physical model where low strain energy material mass can be removed from the component, as explained. Acknowledgements Behzad V. Farahani sincerely acknowledges the funding received from Ministério da Educação e Ciência, Fundação para a Ciência e a Tecnologia (Portugal), under grant PTDC/EME-EME/29339/2017. References Anderson, T.L. 2005. Fracture Mechanics: Fundamentals and Applications, Third Edition (Taylor & Francis). Branco, R., and F. V. Antunes. 2008. 'Finite element modelling and analysis of crack shape evolution in mode-I fatigue Middle Cracked Tension specimens', Engineering Fracture Mechanics , 75: 3020-37. Di Cocco, V., F. Iacoviello, S. Natali, and V. Volpe. 2014. 'Fatigue crack behavior on a Cu-Zn-Al SMA', Frattura ed Integrità Strutturale , 8: 454 61. E647-15e1, ASTM. 2015. Standard Test Method for Measurement of Fatigue Crack Growth Rates ( ASTM International, West Conshohocken, PA). Erdogan, F., and G. C. Sih. 1963. 'On the Crack Extension in Plates Under Plane Loading and Transverse Shear', Journal of Basic Engineering , 85: 519-25. Farahani, B. V., P. J. Tavares, J. Belinha, and P. M. G. P. Moreira. 2017. 'A Fracture Mechanics Study of a Compact Tension Specimen: Digital Image Correlation, Finite Element and Meshless Methods', Procedia Structural Integrity , 5: 920-27. Farahani, Behzad V., Francisco José Malheiro Queirós de Melo, Paulo José da Silva Tavares, and Pedro Miguel Guimarães Pires Moreira. 2020. "Stress intensity factor evaluation for central oriented cracks by stress dead-zone concept." In Material Design & Processing Communications , 1-7. Farahani, Behzad V., Francisco Q. de Melo, Paulo Tavares, and Pedro Moreira. 2020. 'A fracture study of slanted cracks using the stress dead-zone hypothesis', Fatigue & Fracture of Engineering Materials & Structures : 1-15. Farahani, Behzad V., Shayan Eslami, Francisco Q. de Melo, Paulo J. Tavares, and Pedro M.G.P. Moreira. 2019. 'Concept of stress dead zone in cracked plates: Theoretical, experimental, and computational studies', Fatigue & Fracture of Engineering Materials & Structures , 42: 2457 67. Farahani, Behzad V., Paulo J. Tavares, and P. M. G. P. Moreira. 2016. 'SIF Determination with Thermoelastic Stress Analysis', Procedia Structural Integrity , 2: 2148-55. Farahani, Behzad V., Paulo J. Tavares, P. M. G. P. Moreira, and J. Belinha. 2017. 'Stress intensity factor calculation through thermoelastic stress analysis, finite element and RPIM meshless method', Engineering Fracture Mechanics , 183: 66-78. Ferreira, A. J. M. . 2009. MATLAB Codes for Finite Element Analysis - Solids and Structures (Springer Netherlands). Griffith, A. A. 1920. 'Philosophical Transactions', Series A , 221: 163-98. He, Xiaofan, Yinghao Dong, Boxiao Yang, and Yuhai Li. 2018. 'A wide range stress intensity factor solution for an eccentrically cracked middle tension specimen with clamped ends', Engineering Fracture Mechanics , 191: 461-75. Hedayati, Ehsan , and Mohammad Vahedi. 2014. 'Using Extended Finite Element Method for Computation of the Stress Intensity Factor, Crack Growth Simulation and Predicting Fatigue Crack Growth in a Slant-Cracked Plate of 6061-T651 Aluminum', World Journal of Mechanics , 4: 24-30. Iacoviello, F., V. Di Cocco, A. Rossi, and M. Cavallini. 2013. 'Pearlitic ductile cast iron: damaging micromechanisms at crack tip', Frattura ed Integrità Strutturale , 25: 102-08. Iacoviello, F., V. Di Cocco, A. Rossi, and M. Cavallini. 2015. 'Fatigue crack tip damaging micromechanisms in pearlitic ductile cast irons', Fatigue & Fracture of Engineering Materials & Structures , 38: 238-45. Irwin, G.R. 1956. Onset of Fast Crack Propagation in High Strength Steel and Aluminum Alloys (Naval Research Laboratory). Ismail, A. E., M. Q. Abdul Rahman, M. Z. Mohd Ghazali, M. Zulafif Rahim, M. Rasidi Ibrahim, Mohd Fahrul Hassan, Nik Hisyamudin Muhd Nor, A. M. T. Ariffin, and Muhamad Zaini Yunos. 2017. 'Combined mode I stress intensity factors of slanted cracks', IOP Conference Series: Materials Science and Engineering , 226: 012011. Ismail, Al Emran, Kamarul Azhar Kamarudin, and Nik Hisyamudin Muhd Nor. 2017. 'Stress Intensity Factors of Slanted Cracks in Bi-Material