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Usual vehicle suspensions employ hydro-pneumatic absorbers (e.g., oil, colloidal and air dampers) mounted in parallel with compression helical springs. Although the damping coefficient of the vehicle suspension is changing versus the excitation frequency, conventional design method is based on simplified models that assume for constant damping and elastic properties. In this work, three types of suspensions...
This work deals with the modeling and simulation of shock absorbing shells for ballistic vests and helmets to achieve optimal protection. Shock absorbing shell is modeled as a circular membrane with clamped edge. Symmetrical loading patterns were considered as follows: uniformly distributed pressure over the entire surface of the shell, uniformly distributed pressure over a part of the shell's surface,...
This work deals with the modeling and molecular dynamics simulation of the wetting process on brush like and wavelike nanorough surfaces of variable hydrophilic level. Brush like nanorough surfaces are obtained by deposition of a hexagonal packing of alkyl chains on a flat surface, consisted of hexagonal packed carbon atoms. Folding the flat surface a wavelike nanoroughness can be achieved. By the...
Similarities between different phenomena such as the wear-less phononic friction, adhesion hysteresis, wetting or contact angle hysteresis, surface dissipation, slippage, ripplons, etc., strongly indicate that the underlying molecular processes are also the same or related, and that they all involve transfer/dissipation of energy between interdigitated molecules. In this work, based on concepts as...
In this work, fatigue fracture tests on liquid-repellent nanoporous silica micro-particles dispersed in water are reported; then, models of the grain cracking and fragmentation are proposed. Such tests can be regarded, from an external standpoint, as conducted under temporally variable but spatially uniform pressure distribution in the liquid surrounding the silica grains, or from an internal standpoint,...
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