The Creep of Snow under Combined Stress

Particle Rearrangement and Dislocation Creep in a Snow-densification Process

Optimization of Cylindrical Shells Under Combined Loading Against Brittle Creep Rupture

Optimal structural design of cylindrical shells under overall bending, torsion, tension and internal pressure in creep conditions is considered. The material is assumed to be governed by the Norton-Odqvist nonlinear steady creep law. Minimal weight of the shell is the design objective, radius and wall thickness are design variables, and the constraint refers to brittle creep rupture as describe...

Creep Behavior for Combined Rouse-Reptation Mechanism

Recoverable creep compliance JR(t) was analytically calculated for polymer chains relaxing through the Rouse and reptation mechanisms at short and long time scales, respectively. The ratio of the longest relaxation times of these mechanisms, rτ = τRouse/τrep, was varied from 0.056 to 0.0033. The calculation indicated that the effect of the fast Rouse mechanism on the distribution of slow modes ...

Creep Stress Redistribution Analysis of Thick-Walled FGM Spheres

Time-dependent creep stress redistribution analysis of thick-walled FGM spheres subjected to an internal pressure and a uniform temperature field is investigated. The material creep and mechanical properties through the radial graded direction are assumed to obey the simple power-law variation throughout the thickness. Total strains are assumed to be the sum of elastic, thermal and creep strain...

Problems of Structural Optimization Under Creep Conditions

Optimal structural design under creep conditions, initiated over 20 years ago, brings a fairly larg~ variety of problems, interesting both from theoretical and engineering point of view. Existence of the time factor leads to optimization for a prescribed lifetime and the number of independent variables in governing equations increases by one. Practical importance is connected with design of met...