– After thrown onto a solid substrate, very soft spherical gels bounce repeatedly. Separate rheological measurements suggest that these balls can be treated as nearly elastic. The Hertz contact deformation expected in the static (elastic) limit was observed only at very small impact velocities. For larger velocities, the gel ball deformed into flattened forms like a pancake. We measured the siz...

Considering the comprehensive effect of internal non-inertial system planetary gear transmission (PGT) and external body, combined with modified Heywood formula Hertz formula, a calculation model for dynamic bending stress contact PGT in (NIS) is proposed. The coefficients ( K NI ) describing influence additional effects on are defined. Additionally, variation law under two typical conditions v...

One of the most common methods to measure soil mechanical properties (namely cohesion and internal friction angle) is direct shear box test. In this paper the development of a three-dimensional (3D) discrete element soil model for simulation of a cohesive soil’s direct shear test is presented. The aim was to calibrate the properties of the Hertz-Mindlin with bonding contact model available in E...

Hunting is a potentially dangerous phenomenon related to the lateral oscillation of wheels that impacts rails and causes wear infrastructure’s components. Therefore, analysis timely detection hunting can lead application corrective maintenance tasks, reducing damages, costs even derailments as result. In this work, vibration response finite element model rail with hunting-induced loads by singl...

As the key connecting part of rigid flexible coupling manipulator, structural dynamic characteristics bolted joint are analyzed by using simulation technology pro/e and ANSYS. Based on spring equivalent principle, finite element model bolt is established, relationship equation between contact surface pressure preload derived, its stress state analyzed; micro convex deformation Hertz theory, tan...

In engineering design, none of the existing models for calculating contact pressure in pin-loaded lug is fully compatible with actual working conditions. order to obtain a more accurate formula maximum lug, after verifying reliability finite element model PRESCALE measurement film, single-parameter and multi-parameter analysis two types factors affecting distribution compressive surface were co...

It is industry tendency to accurately predict the dynamics of mechanical systems with full consideration errors. Based on Hertz contact theory and general bearing modeling methods, this study proposed a more practical model using numerical method investigate influence assembly error linear guide slide platform. First, methods five types errors are established, based which, nonlinear dynamic dev...

In a recent Letter, Persson [1] suggested a new model of contact between arbitrary randomly rough surfaces. He considered also fractal surfaces which he characterized above the lower cutoff only by their dimension Df and an additional constant. He argued that in the framework of the model, the area of real contact A in most cases is proportional to the load P. However, there are examples which ...