Instability of gradient-dependent elastoviscoplastic model for clay and strain localization analysis

Analytical and experimental determination of the material intrinsic length scale of strain gradient plasticity theory from micro- and nano-indentation experiments

“…Kuhl et al, 2000;Voyiadjis and Dorgan, 2001). In addition, extension of the gradient theory to rate-dependent plasticity/damage has been made recently by few authors (Wang et al, 1998;Aifantis et al, 1999;Oka et al, 2000;Voyiadjis et al, 2003a,b;Gurtin, 2003;Saczuk et al, 2003). The gradient plasticity theories have given reasonable agreements with the aforementioned size dependence encountered in composite material experiments (e.g.…”

A direct finite element implementation of the gradient-dependent theory

“…mn n (24) where N GP is the number of Gauss integration points. The computation of coefficients g mn and g mn is explained in what follows.…”

Modeling nano-indentation tests of glassy polymers using finite elements with strain gradient plasticity

“…Such gradient type of theories require the determination of intrinsic material length scales [18]. Aifantis and co-workers [19][20][21] studied and proposed the elasto-viscoplasticity for the constitutive equations of clay. The theoretical concept for single-crystal viscoplasticity incorporating strain gradient plasticity was developed by Gurtin [22].…”