The present study proposes the further validation of a simple mathematical procedure recently proposed by authors to describe contact and wear evolution in line point contacts. assumed that maximum pressure could be determined using Hertz equations parabolic profile. half-width was obtained equilibrium equation Archard law. Several cases were selected from literature, reporting experimental dat...

Analytical investigations on the contact problems between two homogeneous and isotropic soft bodies were performed to simulate the contact of human buttocks and seat cushions. The cushion materials’ Poisson’s ratio were allowed to be negative. The human buttocks were modeled as an ideal sphere with radius 15 cm, and assumed to have a low Young’s modulus and a Poisson’s ratio close to 0.5. These...

We introduce a contact law for the normal force generated between two contacting, elastically anisotropic bodies of arbitrary geometry. The only requirement is that their surfaces be smooth and frictionless. This obtained from simplification exact solution to continuum elasticity problem takes familiar form Hertz’ law, with difference being orientation-dependence material-specific modulus. rema...

rails fracture by the growth of fatigue crack or critical crack is one of the prevalent defects in railway. the rail fracture, failure and stress analysis should be studied in order to prevention of rail fracture. in this paper, new formulation of contact stress for two rolling bodies is presented, where the results are closed to the hertz stress formulation. moreover, stress analysis is done b...

– The effect of surface curvature on the law relating frictional forces F with normal load L is investigated by molecular dynamics simulations as a function of surface symmetry, adhesion, and contamination. Curved, non-adhering, dry, commensurate surfaces show a linear dependency, F ∝ L, similar to dry flat commensurate or amorphous surfaces and macroscopic surfaces. In contrast, curved, non-ad...

 In practice, clearances in the joints are inevitable due to tolerances, and defects arising from design and manufacturing. In the presence of clearance at a joint, a mechanism gains some additional, uncontrollable degrees of freedom which are the source of error. Moreover, joints undergo wear and backlashes and so cannot be used in precision mechanisms. In this study, the dynamic behaviour of ...

Abstract As the main launch energy of barrel weapon, dynamic mechanical properties gun propellant is very important to evaluate safety. Through transverse drop hammer impact damage test at room temperature and initial vivacity ratio propellant, crack growth law fracture degree damaged were obtained separately. Based on Hertz-Mindlin bonding contact model, discrete element model rosette 19-hole ...

One-dimensional strongly nonlinear phononic crystals were assembled from chains of PTFE (polytetrafluoroethylene) and stainless-steel spheres with gauges installed inside the beads. Trains of strongly nonlinear solitary waves were excited by impacts. A significant modification of the signal shape and an increase of solitary wave speed up to two times (at the same magnitude of dynamic contact fo...