Bacterial biofilms are the most prevalent mode of bacterial growth in nature. Adhesive and viscoelastic properties of bacteria play important roles at different stages of biofilm development. Following irreversible attachment of bacterial cells onto a surface, a biofilm can grow in which its matrix viscoelasticity helps to maintain structural integrity, determine stress resistance, and control ...

The thermal loading during the curing process of an adhesive-bonded joint induces residual stresses in joint, thereby affecting its performance. problem becomes worse case a multi-material involving varying coefficients expansion (CTE) for different parts. A novel approach was developed to model properties automotive grade structural adhesives heat process. material divided into two components:...

The ability of mucus to function as a protective barrier at mucosal surfaces rests on its viscous and elastic properties, which are not well understood at length scales relevant to pathogens and ultrafine environmental particles. Here we report that fresh, undiluted human cervicovaginal mucus (CVM) transitions from an impermeable elastic barrier to non-adhesive objects sized 1 microm and larger...

Conventional adhesives show a decrease in the adhesion force with increasing temperature due to thermally induced viscoelastic thinning and/or structural decomposition. Here, we report the counter-intuitive behaviour of carbon nanotube (CNT) dry adhesives that show a temperature-enhanced adhesion strength by over six-fold up to 143 N cm-2 (4 mm × 4 mm), among the strongest pure CNT dry adhesive...

Several aspects of the rheology of adhesives are important for their application and end use. Coating an adhesive requires the viscosity to fall between maximum and minimum viscosity limits and these depend upon the type of coating process that is to be used. Viscosity data is shown for the maximum and minimum acceptable limits for several types of coater. The modification of the flow propertie...

Abstract This study aims to describe a toughened adhesive’s ratcheting–recovery behavior under reversed cyclic load using viscoelastic–viscoplastic model. As most adhesives are based on synthetic polymers, their tensile and compression response can be different. A series of load–Sunload tests were conducted bulk bonded joints involving tension/compression–shear loads characterize the initial yi...

In this study, modified residual lignins from barley and wheat straws submitted to solid-state fermentation with diverse Streptomyces strains were targeted as binders in eco-friendly castor oil-based polyurethane adhesive formulations. The thermo-rheological adhesion properties of these adhesives examined related the yields. Viscoelastic enhanced by lignin addition, action generally increased v...

We analyze the sensitivity to values of material parameters, layer thickness and impact speed of the plate deflection, the contact force between the impactor and the plate, the maximum length of a crack, and the energy dissipated during the low velocity impact at normal incidence of a clamped rectangular laminate by a rigid hemispherical-nosed cylinder. The laminate is comprised of layers of po...

Dynamic responses of adhesively bonded tubular joints subjected to a harmonic axial load were evaluated with the use of a shear lag model. Adherents were assumed to be elastic and the adhesive was taken to be a viscoelastic material. Effects of tubular joint geometries, material properties and adhesive properties on the dynamic response of the system were investigated. The results showed that t...