PSI - Issue 25

A. Gryguć et al. / Procedia Structural Integrity 25 (2020) 486– 495 Andrew Grygu ć / Structural Integrity Procedia 00 (2019) 000–000

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3. Under pure shear loading, there exists a transition in cracking behaviour from longitudinal cracking (LCF, < 20 000 cycles) to helical cracking (HCF, > 40 000 cycles). This threshold of change in cracking behaviour corresponds with a pure shear cyclic SED of 0.6 [MJ/m 3 ]. 4. In multiaxial load paths, when the shear SED contribution is low (<0.6 [MJ/m 3 ]), the contribution of helical cracking is suppressed, and the resulting early cracking behaviour is purely transverse. Conversely, when the shear SED contribution is high (>0.6 [MJ/m 3 ]), the resulting behaviour is mixed cracking with presence of branching and/or secondary cracks, as the contribution of longitudinal cracking is more significant. Acknowledgements The financial support of the Natural Sciences and Engineering Research Council of Canada (NSERC) through the Automotive Partnership Canada (APC) under APCPJ 459269-13 grant with contributions from Multimatic Technical Centre, Ford Motor Company, and Centerline Windsor are acknowledged. The authors would also like to acknowledge J. McKinley from CanmetMATERIALS for forging trials. References [1] V. Kevorkijan, “AZ80 and ZC71/SiC/12p closed die forgings for automotive applications: technical and economic assessment of possible mass production,” Mater. Sci. Technol. , vol. 19, no. 10, pp. 1386–1390, 2003. [2] R. Matsumoto and K. Osakada, “Development of Warm Forging Method for Magnesium Alloy,” Mater. Trans. , vol. 45, no. 9, pp. 2838– 2844, 2004. [3] Q. Wang, Z. M. Zhang, X. Zhang, and J. M. Yu, “Precision forging technologies for magnesium alloy bracket and wheel,” Trans. Nonferrous Met. Soc. China (English Ed. , vol. 18, no. SPEC. ISSUE 1, pp. s205–s208, 2008. [4] J. 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