IMPACT BEHAVIOUR AND RESIDUAL STRENGTH OF HONEYCOMB STRUCTURES

The goal of this article is to study the behavior of sandwich structures with honeycomb core during and after an impact. In this purpose, a test program was created and afterwards was applied. It consists in the application of multiple impact energies over the multi-layered structure. Impacted specimens are subjected to a compression test in order to determine the load capacity after impact. The results are summarized at the end of the paper in a graph that shows the loading capacity of multi-layer structure depending on the impact energy

Combining Berendsen Thermostat with Dissipative Particle Dynamics (DPD) for Polymer Simulation

In this article we present a new thermostat - theory and simulation results - obtained by combining two thermostats Berendsen and DPD types. The new thermostat provides a predictable behavior with temperatures that do not deviate from the reference and with thermal rate constant agreement between simulations and theory. The presented work can be used for the study of polymer properties

DEVELOPING A NOVEL ALGORITHM FOR THE COMPUTATION OF POISSON'S RATIO USING MOLECULAR DYNAMICS FOR POLYMERS

This article presents a method for the computation of Poisson's ratio for an elastic material using molecular dynamic theory, based on an original algorithm and implemented in GROMACS environment. An overview of the theoretical approach (algorithm, computation formulas) is presented and also the simulation results. The simulation results for the chosen system (expanded polystyrene) are in agreement with the experimental results

EVALUATION OF THE INFLUENCE FOR THE COMPONENTS OF A MULTILAYERED HONEYCOMB COMPOSITE MATERIAL SUBJECTED TO COMPLEX STATIC LOADING

The purpose of these article is the evaluation of the influence of the components of a multilayered honeycomb composite material, about the load caring capacity, when the material is subjected to a complex static loading , in the linear elastic domain. The numerical simulation approach was used for these study, and the results were validated experimentally

Improved Adaptive Resolution Molecular Dynamics Simulation

International audienceMolecular simulations allow the study of properties and interactions of molecular systems. This article presents an improved version of the Adaptive Resolution Scheme that links two systems having atomistic (also called fine-grained) and coarse-grained resolutions using a force interpolation scheme. Interactions forces are obtained based on the Hamiltonian derivation for a given molecular system. The new algorithm was implemented in GROMACS molecular dynamics software package and tested on a butane system. The MARTINI coarse-grained force field is applied between the coarse-grained particles of the butane system. The molecular dynamics package GROMACS and the Message Passing Interface allow the simulation of such a system in a reasonable amount of time

Metal Inclusion Influence on Mechanical Behaviour of Plates Made of Araldite

Due to the need for creating new, more efficient, materials for use in structures manufacturing, a high interest issue for researchers and engineers is to analyze the plastic or composite material defects and their influence over the mechanical behavior of the structures. Presented in this paper are the results of experimental analysis and its validation, made by finite element numerical analysis. The first part of the analysis process consisted in obtaining the reference values from plastic plates containing no metallic inclusions, which were analyzes both experimentally and numerically, by subjecting them to a flexural load. A numerical validation of the experimental model was obtained. Next, same kind of numerical and experimental analyses were performed, but this time plastic plates containing metallic inclusions were subjected to the same loads as before. In doing so, the study revealed the local and global influences of inclusions over the mechanical behavior of plastic plates. &nbsp