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 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 . 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 .
