A design of peel-speed sensitive flexible fastener was proposed based on a novel modified polyurethane. Taking the microtrichia head-arrester system lestes barbarous as bionic prototype, structure micro protuberance designed self-mating type with hemispherical caps. Considering nonlinearities contact behavior and material property, micromechanical model typical interlocking element is establish...

Abstract In order to study the surface interaction between binder and TKX-50, fluororubber F2603, ETPE, BR were adhered of TKX-50 by direct solvent volatilization method. The spreading coefficient adhesion work three adhesives analyzed a surficial performance test. coating effect safety coated binders discussed XPS, SEM, mechanical sensitivity. results showed that form efficient bonding. F2603 ...

The remarkable mechanical properties of graphene, the thinnest, lightest, and strongest material in existence, are desirable in applications ranging from composite materials to sensors and actuators. Here, we demonstrate that these mechanical properties are strongly affected by the interaction with the substrate onto which graphene is deposited. By measuring the temperature-dependent deflection...

In this investigation three effects are included in a recently developed scale-dependent multi-asperity model of elastic contact and friction. First, a Weibull distribution of asperity heights is used, which allows the skew and kurtosis to be varied, but not independently of each other. Second, the effect of non-constant radii of curvature of the asperity summits, with the curvature varying wit...

We have characterized the frictional properties of nanostructured carbon films grown by supersonic cluster beam deposition via an atomic force-friction force microscope (AFM-FFM). The experimental data are discussed on the basis of a modified Amonton's law for friction, stating a linear dependence of friction on load plus an adhesive offset accounting for a finite friction force in the limit of...

B4C ceramic particulate–reinforced Al 5083 matrix composite with various B4C content was fabricated successfully via hot-press sintering under Argon atmosphere. B4C particles presented relative high wettability, bonding strength and symmetrical distribution in the Al 5083 matrix. The hardness value, friction coefficient and wear resistance of the composite were higher than those of the Al 5083 ...

Polypropylene (PP) has poor adhesion to metals and other surfaces for its chemical structure. Hence, chemical modification of PP is necessary for metal surface coating application. In this research, grafting of maleic anhydride (MA) onto co(propylene-b-ethylene) in the presence of a dicumyl peroxide (DCP) was accomplished in a single screw extruder. Characteristics of the modified polymer were ...

introduction: opium addiction can change immune response to types of stress such as injury or trauma due to alterations in the in secretion status of cytokines in the body. in this study, effects of opium addiction on wound healing and post-operative adhesion bands were assessed after laparotomy. materials and methods: male rats (n=20) were randomly divided into opium addicted (documented with ...

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determination of blood compatibility is an important problem in blood contacting devices. in this study, two classes of materials including polyurethane (based on polyethylene glycol and poly tetrametylene oxide) and polyvinyl alcohol samples, with different hydrophilicity properties were synthesized and their physico-chemical properties were compared. water uptake ratio, ftir spectroscopy, and...