User login

Navigation

You are here

yield surface

Ajeet Kumar's picture

Geometrically exact elastoplastic rods -determination of yield surface in terms of stress resultants

This work addresses the determination of yield surfaces for geometrically exact elastoplastic rods. Use is made of a formulation where the rod is subjected to an uniform strain field along its arc length, thereby reducing the elastoplastic problem of the full rod to just its cross-section. By integrating the plastic work and the stresses over the rod's cross-section, one then obtains discrete points of the yield surface in terms of stress resultants. Eventually, Lamé curves in their most general form are fitted to the discrete points by an appropriate optimisation method.

Concrete Damaged PLasticity - Effect of Kc

Choose a channel featured in the header of iMechanica: 

I'm trying to develop yield surface of a material for a particular value of hydrostatic stress(since CDP model uses drucker-prager hypothesis).. In user manual, it is given that, for Kc value of 1, i should get a circle, and for Kc value of 0.667, i should get a shape of inverted triangle in deviatoric plane.. But I have tested for 3 values of Kc, 0.667, 0.9 and 1, for all, i'm getting the same inverted triangle in the deviatoric plane. 

*Concrete Damaged Plasticity 
22., 0.33, 1.16, 0.667, 0. 

Concrete Damaged PLasticity - Effect of Kc

I'm trying to develop yield surface of a material for a particular value of hydrostatic stress(since CDP model uses drucker-prager hypothesis).. In user manual, it is given that, for Kc value of 1, i should get a circle, and for Kc value of 0.667, i should get a shape of inverted triangle in deviatoric plane.. But I have tested for 3 values of Kc, 0.667, 0.9 and 1, for all, i'm getting the same inverted triangle in the deviatoric plane. 

*Concrete Damaged Plasticity 
22., 0.33, 1.16, 0.667, 0. 

Piriform yield surface

Taxonomy upgrade extras: 
Amit Pandey's picture

Evoution of Yield surfaces: Past and Future Trend - Part 3

 My last two posts on this series

Part- 1 (node/9016) and

Part- 2 (node/9073)

were mainly focussed on the tension–torsion (σ11–√3σ12) stress space. This paper will be the final post on this series and will focus mainly on the behavior of  both of these alloys under tension–tension (σ11–σ22)space and conclude this ongoing research.

Abstract.

Subscribe to RSS - yield surface

Recent comments

More comments

Syndicate

Subscribe to Syndicate