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Large plasticity induced crack initiation from U-notches in thin aluminum sheets under mixed mode loading

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It is shown that the experimental failure loads are well predicted by means of both the UMTS-EMC and UMS-EMC criteria. Moreover, the experimental observations and the elastic-plastic finite element analyses indicate that the U-notched aluminum sheets fail by the large-scale yielding (LSY) regime. | Large plasticity induced crack initiation from U-notches in thin aluminum sheets under mixed mode loading Engineering Solid Mechanics 2017 39-60 Contents lists available at GrowingScience Engineering Solid Mechanics homepage www.GrowingScience.com esm Large plasticity induced crack initiation from U-notches in thin aluminum sheets under mixed mode loading A. R. Torabi and B. Mohammad Hosseini Fracture Research Laboratory Faculty of New Sciences amp Technologies University of Tehran P.O. Box 14395-1561 Tehran Iran A R T I C L EI N F O ABSTRACT Article history Ductile failure is investigated experimentally and theoretically in U-notched Al 7075- T6 thin Received 6 July 2016 sheets under mixed mode I II loading. First several U-notched rectangular sheets are subjected Accepted 2 October 2016 to mixed mode I II failure tests and the load-carrying capacity of the sheets are experimentally Available online recorded. Then the Equivalent Material Concept EMC is employed in conjunction with the 3 October 2016 Keywords U-notch maximum tangential stress UMTS and U-notch mean stress UMS criteria to Load-carrying capacity theoretically estimate the load-carrying capacity of the U-notched Al 7075-T6 sheets. It is Equivalent Material Concept shown that the experimental failure loads are well predicted by means of both the UMTS-EMC Ductile failure and UMS-EMC criteria. Moreover the experimental observations and the elastic-plastic finite U-notch element analyses indicate that the U-notched aluminum sheets fail by the large-scale yielding Abrupt fracture LSY regime. Mixed mode I II loading 2017 Growing Science Ltd. All rights reserved. Nomenclature dc Critical distance of the UMS criterion measured from the notch tip dc U Critical distance of the UMS criterion measured from the coordinate origin E Elastic modulus K Strain-hardening coefficient K IU Mode I notch stress intensity factor NSIF for a U-notch K IIU Mode II notch stress intensity factor NSIF for a U-notch K IcU Mode I .