A note on hypoplastic yielding

TL;DR

This paper explores the concept of yield surfaces in hypoplasticity, examining their relation to physical yielding through stress derivatives and stress rates, providing insights into the theoretical understanding of material behavior.

Contribution

It offers a clarification of the yield surface definition in hypoplasticity and its connection to physical yielding phenomena.

Findings

Yield surface relates to vanishing stress derivatives.

Vanishing of the corotational stress rate indicates yielding.

Provides a theoretical link between stress measures and yielding in hypoplasticity.

Abstract

This note discusses briefly the definition of yield surface in hypoplasticity in connection with the physical notion of yielding. The relation of yielding with the vanishing of the material time derivative of the stress tensor and the vanishing of the corotational stress rate is investigated.