Frictional Energy Dissipation in Wavy Surfaces

Abstract

Accurate estimation and tuning of frictional damping are critical for proper design, safety, and reliability of assembled structures. In this study, we investigate how surface geometry and boundary conditions affect frictional energy dissipation under microslip contact situations. In particular, we investigate the frictional losses of a two-dimensional (2D) deformable wavy surface in contact with rigid plate under specific normal and tangential loading. We also propose a dissipation tuning mechanism by tension-induced wrinkling of a composite surface. This surface is made of stiff strips printed on a compliant substrate. We show that the contact geometry of wrinkling surfaces can be altered significantly by tensile loading and design of the composite surface. Using this, we present frictional dissipation maps as functions of applied tension and one of the geometric parameters in the composite design; spacing between stiff strips. Those maps illustrate the dissipation tuning capability of wrinkled surfaces, and thus present a unique mean of damping control.

Multi-Analytical Framework to Assess the In Vitro Swallowability of Solid Oral Dosage Forms Targeting Patient Acceptability and Adherence

“…High normal load pressures led to the suppression of sliding, whereas low pressures promoted frictional slip behavior; noticeably, Opadry ® EZ most effectively imparted lubricity in comparison to other formulations, as observed in Figure 4 . The literature has demonstrated that polysaccharide gums such as xanthan, carrageenan, guar, and konjac gum possess unique abilities to dissipate frictional energies through their saccharide side branch structures due to the greater extent of coil–helix transformation that imbibes superior volumes of water, creating thin aqueous sheets for improved gliding [ 65 , 66 , 67 ]. Furthermore, the results confirmed that the critical shear force needed to initiate lateral motion of binary film-coated tablets in comparison to uncoated, KIR, HPMC, or PVA-coated tablets was greater than the minimum transitional force of the common, aforementioned commercial coating systems, an indication of the least resistant wet slip behavior.…”

Experimental Research on Thermomechanical Properties of Thermal Energy Storage Cement Mortar Incorporated with Phase‐Change Material

“…is phenomenon can be due to the fact that the enriched porosity of cement mortar led to the increase of energy dissipation [33]. In addition, the loose contact between DSP/CNF-EG and cement matrix could cause the interface friction action, also dissipating a lot of energy under the vibration load [39]. Based on the obtained storage modulus and loss modulus, the loss tangent of the samples can be calculated by using the following equation [40]:…”