Employing the technique of vanishing viscosity and time rescaling, we show the existence of quasistatic evolutions for elastoplastic materials with incomplete damage affecting both the elastic tensor and the plastic yield surface, in a softening framework and in small strain assumptions.

stresses in the rod. If the force we apply is small enough, the rod behaves as an elastic body: when we release it, it will return to its original state. But if we apply a lot of twisting force, we will eventually change the rod’s structure: some portion of it will behave plastically and will be permanently changed. If the whole rod behaves elastically, or if it all behaves plastically, then mo...

Abstract Structural superlubricity is a theoretical concept stating that the friction force absent between two rigid, incommensurate crystalline surfaces. However, elasticity of contact pairs could modify lattice registry at interfaces by nucleating local slips, favoring commeasure. The validity structural thus concerned for large-scale systems where energy cost elastic distortion to break low....

General thermodynamic and kinetic approaches for sublimation inside an elastoplastic material are developed for large strains. Various conceptual problems related to the effect of irreversible plastic deformation and dissipation, path-dependence of the appearance of a critical nucleus, and the presence of large strains are considered. Two transformation paths are studied: nucleation via homogen...

In order to develop predictive wear laws, relevant material parameters and their influence on the rate need be identified. Despite decades of research, there is no agreement mathematical form equations even simplest models, such as Archard’s, contain unpredictable fit parameters. Here, we propose a simple model for adhesive in dry sliding conditions that contains only based properties surface T...

A (microscopic) static elastoplastic field theory of dislocations with moment stress is considered. The relationship between the moment stress and the Nye tensor is discussed and used for the dislocation Lagrangian. We discuss the stress field of a screw dislocation which is modified in the core region due to the appearance of moment stress.

A contact model for rough surfaces based on the fractal theory is proposed in present work. Firstly, deformation of material divided into four stages: elastic deformation, first elastoplastic second and full plastic deformation. And variation hardness considered when analyzing characteristics a single asperity within stages. Secondly, size distribution function spots at different frequency leve...

large sums of fruits are annually wasted due to mechanical damage and bruise inflicted upon them during harvesting, handling, storage and packaging. the research which has been done to analyze the mentioned processes mostly used practical operational techniques with the results being applicable in certain defined conditions. the aim of this research was to develop computer models for an optimiz...