Issue 29

N.A. Nodargi et alii, Frattura ed Integrità Strutturale, 29 (2014) 111-127; DOI: 10.3221/IGF-ESIS.29.11 126 Figure 5 : Von Mises yield function. (a) Yield surface; (b) Dissipation function graph. Figure 6 : Von Mises–Tresca ( 20 m  ) yield function. (a) Yield surface; (b) Deviatoric section of the yield surface; (c) Dissipation function graph; (d) Unitary level set of the dissipation function. Fig. 5 shows the corresponding yield surface and dissipation function graph. It is worth noting that the dissipation function results convex, non-negative, zero only at the origin and positively homogeneous of degree one. The latter feature is clear from its cone-like graph. Von Mises–Tresca yield function The von Mises–Tresca yield function corresponds to the choice (see [17] and references therein): (a) (b) (a) (b) (c) (d)