AE detection and analysis usually requires a specific, costly platform due to its particular burst nature high-frequency content. This experimental study investigates the relationship between low-demand acoustic emission parameters (AE) occurrence of stick–slip (SS) at Hertzian linear contact. Hence, correlation basic characteristics (amplitude, energy, evolution in time) with (static kinetic f...

Hertzian contact of a rigid sphere and highly deformable soft solid is investigated using integrated photoelasticity. The experiments are performed by pressing styrene 15 mm diameter against 44 × 47 mm3 cuboid made 5% wt. gelatin, inside circular polariscope, with range forces. emerging light rays processed considering that the retardation each ray carries cumulative effect traversing contact-i...

The interfacial contact pressure and shear traction distributions are found for a sphere pressed onto an elastically similar half-space whose surface is populated by a uniform array of spherical asperities, when the normal load is constant and an oscillatory shear, less than that needed to cause sliding, is imposed. Details of the load history suffered by asperities in an outer sliding annulus ...

Non-destructive Hertzian contacts are used to couple ultrasonic waves for characterization and defect detection in anisotropic solid pates. Spring loaded quartz rods bonded to PZT-5H transducers are used to form a point source point receiver pair and ultrasonic plate modes are excited and detected around 200 KHz with 50 dB signal to ratio at the receiving end. Measurements are performed on sili...

The paper presents results obtained using a transient analysis technique for point contact elastohydrodynamic lubrication (EHL) problems based on a formulation that couples the elastic and hydrodynamic equations. Results are presented for transverse ground surfaces in elliptical point contact that show severe film thinning and asperity contact at the transverse limits of the contact area. This ...

Wheel/rail contact simulation is one of the most complicated problems in the modeling of railway vehicles. The wheel/rail interaction plays a unique role in rail vehicle dynamics. In this paper, the dynamic response of the wheel on irregular rail track is analyzed with analytical approach using the method of Multiple Scales (MMS). The Hertzian contact theory is used to obtain the relationshi...

Carbon fiber-reinforced plastic (CFRP) is used widely in aerospace. The cutting mechanism of CFRP markedly different from that metals due to anisotropic and non-homogeneous material structure. mechanisms are highly dependent on the fiber orientation. quality machined surface can be affected by fracture models. In this paper, based elastic foundation beam theory Hertzian contact theory, mechanic...

Scanning probe microscope-enabled nanoindentation is increasingly reported as a means to assess the mechanical properties of nanoscale, compliant material volumes such as polymeric films and bio-membranes. It has been demonstrated experimentally that the Hertzian contact model developed for linear elastic materials of semi-infinite thickness fails to accurately predict the nominal elastic modul...

A numerical model to predict train induced vibrations is presented. The dynamic computation considers mutual interactions in vehicle/track coupled systems by means of a finite and discrete elements method. The rail defects and the case of out-of-round wheels are considered. The dynamic interaction between the wheel-sets and the rail is accomplished by using the non-linear Hertzian model with hy...