1 Dipartimento di Matematica e Fisica, Università Cattolica del Sacro Cuore, Via dei Musei 41, I-25121 Brescia, Italy [email protected] 2 Dipartimento di Matematica, Università di Brescia, Via Valotti 9, I-25133 Brescia, Italy [email protected] 3 Dipartimento di Matematica e Fisica, Università Cattolica del Sacro Cuore, Via dei Musei 41, I-25121 Brescia, Italy a.musesti@d...

We present exact results for the contact forces in a three dimensional static piling of identical, sti and frictionless spheres. The pile studied is a pyramid of equilateral triangular base (“stack of cannonballs”) with a FCC (face centered cubic) structure. We show in particular that, as for the two dimensional case, the pressure on the base of such a pile is uniform. c © 1999 Elsevier Science...

1.1 Background Biomechanical Systems • Physical Knee Models • Phenomenological Mathematical Knee Models • Anatomically Based Mathematical Knee Models 1.2 Three-Dimensional Dynamic Modeling of the Tibio-Femoral Joint: Model Formulation Kinematic Analysis • Contact and Geometric Compatibility Conditions • Ligamentous Forces • Contact Forces • Equations of Motion 1.3 Solution Algorithm DAE Solvers...

Musculoskeletal modeling and optimization theory are often used to determine muscle forces in vivo. However, convincing quantitative evaluation of these predictions has been limited to date. The present study evaluated model predictions of knee muscle forces during walking using in vivo measurements of joint contact loading acquired from an instrumented implant. Joint motion, ground reaction fo...

This paper addresses the identifiability of the inertial parameters and the contact forces associated with an object making and breaking frictional contact with the environment. Our goal is to explore under what conditions, and to what degree, the observation of physical interaction, in the form of motions and/or forces, is indicative of the underlying dynamics that governs it. In this initial ...

Mechanical loading is believed to be a critical factor in the development and treatment of knee osteoarthritis. However, the contact forces to which the knee articular surfaces are subjected during daily activities cannot be measured clinically. Thus, the ability to predict internal knee contact forces accurately using external measures (i.e., external knee loads and muscle electromyographic [E...

The low Young's modulus of biological particles results in their large deformation against the AFM probe forces; therefore, it is necessary to study the contact mechanics of bioparticles in order to predict their mechanical behaviors. This paper specifically deals with the contact mechanics of DNA nanoparticles with spherical and cylindrical shapes during manipulation. In previous studies, ...

BACKGROUND Knee models often do not contain thigh-calf contact which occurs in deep knee flexion. Thigh-calf contact is expected to reduce muscle forces and thereby affects internal stresses in the knee joint. The purpose of this study was to measure thigh-calf contact forces. Two deep knee flexion activities were selected: squatting and kneeling. METHODS Ten healthy subjects participated in ...