Abstract
AbstractThis work investigates gradient‐enhanced damage evolution by performing a parameter study for the authors's finite element shell model [1], in which the free energy function is enhanced phenomenologically in terms of a non‐local damage variable and its gradient on the mid‐surface of shell structures. This enhancement gives rise to an introduction of gradient parameters in terms of a substructure‐related intrisic length‐scale and a relationship between non‐local and local damage variable. Based on the global displacement‐force curves obtained from shock‐tube tests on aluminium plate specimens, the gradient parameters are determined to validate the proposed shell model. The influence of spatial gradient of loading on the material behaviour within a macroscopic continuum element will be discussed through several examples. (© 2012 Wiley‐VCH Verlag GmbH & Co. KGaA, Weinheim)
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