In the Discrete Element modelling of soils, micromechanical behaviour at contacts has often been considered to have a minor influence on macromechanical response, leaving basic theoretical models (e.g., Hertz) describe contact response in normal direction. A realistic description may be crucial especially when investigating small strain ranges. Recent experimental inter-particle loading tests g...

in this paper, the propagation of the waves in the laminated composite plates which is subjected to low velocity impact is investigated using the finite element method. a rigid metallic projectile with spherical nose is considered and the impact of this projectile with laminated composite is studied in this study. considering a finite element model the governing equations of the problem is disc...

Researchers have developedmanymodels to simulate the elasto-plastic contact of spheres. However, there does not appear to exist a closed-form analytical model for elasto-plastic three-dimensional sinusoidal contact. This work uses a finite element model (FEM) to characterize elasto-plastic sinusoidal contact. Although at initial contact the sphere and sinusoidal case are very similar and can bo...

The prediction quality of discrete element method (DEM) models for railway ballast can be expected to depend on three points: the geometry representation of the single particles, the used contact models and the parametrisation using principal experiments. This works aims at a balanced approach, where none of the points is addressed with excessive depth. In a first step, a simple geometry repres...

Polydomain liquid crystalline (nematic) elastomers have highly unusual mechanical properties, dominated by the dramatically nonlinear stress–strain response that reflects stress-induced evolution of domain patterns. Here, we study classical Hertz indentation problem in such a material. Experimentally, find polydomain nematic display smaller exponent than 3/2 load vs. depth response. This is puz...

the equations governing the motion of steel balls and their impact onto shell liners in industrial semi-autogenous grinding (sag) mills are derived in full details by the authors and are used in order to determine the effective design variables for optimizing the working conditions of the mill and to avoid severe impacts which lead to the breakage of sag mill shell liners. these design variable...

| This paper presents a method to compute stiiness matrices for compliant grasps and xtures. While the linear spring contact model has been widely used by robotics researchers, it is in general not accurate for practical applications. More realistic models, including the well-veriied Hertz model, are incorporated by use of overlap functions. We derive a stiiness matrix formula that considers su...

Wheel wear has been a concern in the railway for several decades. Studying the form change of the wheel/rail contacts in particular railways consisting of sharp curves helps to identify the risk of severe or catastrophic wear to minimize maintenance costs in order to be competitive in the transportation business. In this paper, the wheel/rail contact was studied on the particular railways. The ...