This paper is on the elasto-plastic analysis of plane stress problems. A five-parameter yield surface is presented. This yield criterion uses associate flow along with mixed hardening rule. The analytical formulations are written and related computer program for non-linear analysis is prepared. Finally, based on the formulations, numerical examples are solved.

When viscous fluid in a corner is disturbed, eddies can form the absence of inertia. Examples flow configurations which this motion occurs include through an abrupt contraction and over cavity. Six decades ago, Moffatt ( J. Fluid Mech. , vol. 18, 1964, pp. 1–18) calculated slow Newtonian fluids sharp corners, detailing his eponymous ‘Moffatt eddies’. In study we examine flows viscoplastic mater...

NASA has identified the Stirling power converter as a prime candidate for the next generation power system for space applications requiring 60,000 hours of operation. To meet this long-term goal, several critical components of the power converter were analyzed using advanced structural assessment methods. Perhaps the most critical component, because of its geometric complexity and operating env...

Local damage models are known to produce pathological mesh dependence in finite element simulations. The solution is to either use a regularization technique or to adopt a non-local damage model. Viscoplasticity is one technique which can regularize the mesh dependence of local damage model by incorporating a physical phenomenon in the constitutive model i.e. rate effects. A detailed numerical ...

Inspired by the formation of geological structures as earth's crust deforms magmatic intrusions, we investigate elastohydrodynamic growth a viscoplastic blister under an elastic sheet. By combining experiments, scaling analysis and numerical simulations reveal new regime for blister's height $\sim t^{5/9}$ radius t^{2/9}$. A plug like flow inside dictates its dynamics, whereas takes quasi-stati...

In this dataset, 15 samples of laponite-CMC mixes were realized and their viscoplastic properties are determined. Rheological parameters are then expressed as a function of age and components concentrations.

We study the injection flow of a heavy viscoplastic fluid into light Newtonian fluid, via modelling and experiments. The is carried out downward, an eccentric inner pipe inside vertical closed-end outer pipe. This configuration results in core surrounded by annular fluid. structured mixing negligible. As rate increases typical experiment, we observe three distinct regimes, associated with behav...