Damage Development in Rod-on-Rod Impact Test on 1100 Pure Aluminum

ORAL

Abstract

Stress triaxiality plays a major role in the nucleation and growth of ductile damage in metals and alloys. Although, the mechanisms responsible for ductile failure are the same at low and high strain rate, in impact dynamics the time resolved stress triaxiality and plastic strain accumulation at the material point establish the condition for ductile failure to occur. In this work, ductile damage development in 1100 commercially pure aluminum was investigated by means of rod-on-rod (ROR) impact tests. Based on numerical simulations, using a CDM model that accounts for the role of pressure on damage parameters and stochastic variability of such parameters, the impact velocity for no damage, incipient and fully developed damage were estimated. ROR tests at selected velocities were performed and damage distribution and extent was investigated by sectioning of soft recovered samples. Comparison between numerical simulations and experimental results is presented and discussed.

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Authors

  • Gianluca Iannitti

    TECHDYN Engineering

  • Nicola Bonora

    University of Cassino and Southern Lazio

  • Neil Bourne

    University of Manchester, CMEC, The University of Manchester, Research Complex at Harwell Rutherford Appleton Laboratory, Didcot, Oxfordshire, OX11 0FA, United Kingdom., UMARI, School of Materials, University of Manchester, Oxford Road, Manchester M13 9PL,, School of Materials, University of Manchester, Rutherford Appleton Laboratory, Didcot, Oxfordshire, OX11 0FA, United Kingdom., Manchester X-ray Imaging Facility, School of Materials, University of Manchester, Oxford Road, Manchester M13 9PL, United Kingdom., CMEC, School of Materials, University of Manchester, Rutherford Appleton Laboratory, Didcot, Oxfordshire, OX11 0FA, United Kingdom.

  • Andrew Ruggiero

    University of Cassino and Southern Lazio

  • Gabriel Testa

    University of Cassino and Southern Lazio