The aim of this paper is to show that damage mechanisms can account for the response of lamellar bone to nanoindentation tests, with particular regards to the decrease of indentation stiffness with increasing penetration depth and to the loss of contact stiffness during the unloading phase of the test. For this purpose, indentation experiments on bovine cortical bone samples along axial and tra...

It has been hypothesised that the impact duration of a blunt head impact significantly affects the peak intracranial pressures, and that for short impact durations these pressure peaks could reach sufficient magnitude to cause cavitation in the blood vessels of the brain. Two finite element models of pressure wave propagation in the brain have been developed to explore the pressure response to ...

in this paper, dynamic analysis of the composite truncated sandwich conical shells (stcs) with various boundary conditions subjected to low velocity impact was studied analytically, based on higher order sandwich panel theory. impact was assumed to occur normally over to the top face-sheet and the contact force history is predicted using two solution models of the motion are derived based on ha...

Abstract. This paper aims the study of lightweight gears through a novel approach based on multibody model contact-based with pseudo-rigid teeth. method considers teeth as bodies attached to main body revolute joints and torsion springs precomputed stiffness. Thanks this approach, lightening is considered by varying value stiffness parameter. To validate method, first step compares Transmission...

If two elastic bodies with rough surfaces are first pressed against each other and then loaded tangentially, sliding will occur at the boundary of the contact area while the inner parts may still stick. With increasing tangential force, the sliding parts will expand while the sticking parts shrink and finally vanish. In this paper, we study the fractions of the contact area, tangential force an...

This Paper is about landing control of legged robot. Body stiffness and damping is used as landing strategy of a legged robot. First, we only used stiffness control method to control legged robot landing. Second control method,sliding mode controller and feedback linearization controller is applied to enhance position control performance. Through these control algorithm, body center of gravity ...

A hybrid docking simulator is a hardware-in-the-loop (HIL) simulator that includes a hardware element within a numerical simulation loop. One of the goals of performing a HIL simulation at the European Proximity Operation Simulator (EPOS) is the verification and validation of the docking phase in an on-orbit servicing mission. A key feature of the HIL docking simulator setup is a feedback loop ...

Measurements in sandy ocean sediments over a broad range of frequencies show that the sound speed dispersion is significantly greater than that predicted by the Biot-Stoll model with constant coefficients, and the observed sound attenuation does not seem to follow a consistent power law. The observations may be explained in terms of the Biot-Stoll model with frequency-dependent complex frame bu...

The article presented two proposals for construction of a flexible element with variable stiffness, in which construction is limited, or is it completely eliminated the mechanical elastic member such as spring. Their properties vary in the extent applicable member stiffness and speed of reaction to contact with an obstacle. By limiting, or eliminating the mechanical elastic member can be achiev...

BACKGROUND The Dynesys system provides stability for destabilized spines while preserving segmental motion. However, clinical studies have demonstrated that the Dynesys system does not prevent adjacent segment disease. Moreover, biomechanical studies have revealed that the stiffness of the Dynesys system is comparable to rigid fixation. Our previous studies showed that adjusting the cord preten...