Wheel wear has been a concern in the railway for several decades. Studying the form change of the wheel/rail contacts in particular railways consisting of sharp curves helps to identify the risk of severe or catastrophic wear to minimize maintenance costs in order to be competitive in the transportation business. In this paper, the wheel/rail contact was studied on the particular railways. The ...

| This paper presents a method to compute stiiness matrices for compliant grasps and xtures. While the linear spring contact model has been widely used by robotics researchers, it is in general not accurate for practical applications. More realistic models, including the well-veriied Hertz model, are incorporated by use of overlap functions. We derive a stiiness matrix formula that considers su...

An analysis is presented to estimate the perturbation of morphology-dependent optical resonances (MDRs) of spherical dielectric cavities due to acceleration. In the model, the optical cavity is attached to a rigid base that is accelerating. Hertz contact theory is used to describe the contact surface between the base and the sphere, and the Navier equation is solved to obtain an expression for ...

Since the introduction of Finite Element Tearing and Interconnecting (FETI) by 10 Farhat and Roux in 1991, the method has been recognized to be an efficient parallel technique 11 for the solution of partial differential equations. In 2003 Langer and Steinbach formulated its 12 boundary element counterpart (BETI), which reduces the problem dimension to subdomain 13 boundaries. Recently, we have ...

The ultimate properties of a fibrous composite system depend highly on the transverse mechanical properties of the fibers. Here, we report the size dependency of transverse elastic modulus in cellulose nanocrystals (CNCs). In addition, the mechanical properties of CNCs prepared from wood and cotton resources were investigated. Nanoindentation in an atomic force microscope (AFM) was used in comb...

A boundary-domain integral equation for a coated half-space (elastically isotropic homogeneous substratum, possibly anisotropic coating layer) is developed. The half-space fundamental solution is used, so that the discretization is limited to the potential contact zone (boundary elements), the potentially plastic part of the substratum and the coating layer (domain integration cells). Steady-st...

– We investigated impacts of nearly elastic spherical gels (very soft balls) onto a solid substrate. The Hertz contact deformation expected in the static (elastic) limit was observed only at very small impact velocities. For larger velocities, a gel ball deformed into flattened forms like a pancake. We measured the size of gel balls at the maximal deformation and a contact time as a function of...