The shear failure and friction mechanisms of bioinspired adhesives consisting of elastomer arrays of microfibres terminated by mushroom-shaped tips are investigated in contact with a rigid lens. In order to reveal the interplay between the vertical and lateral loading directions, experiments are carried out using a custom friction set-up in which normal stiffness can be made either high or low ...

This study investigates whether it is necessary to consider nonlinear (rather than linear) adhesive viscoelasticity when considering the behaviour of an FRP-bonded metallic beam at warm service temperatures (25 °C, 30 °C and 40 °C). The paper presents finite element analyses that compare effects linear creep in bonded joint for two different FRP-strengthened beams (steel cast-iron). modelling w...

We study three-dimensional finite transient deformations of transparent poly-methyl-methacrylate (PMMA)/adhesive/polycarbonate (PC) laminates impacted at low speed by a hemispherical nosed rigid cylinder using the commercial finite element (FE) software LS-DYNA. The two glassy polymers PMMA and PC are modeled as thermo-elasto-visco-plastic materials by using the constitutive relation proposed b...

Many marine invertebrates form strong, temporary attachments using viscoelastic gels. To better understand these adhesives, an analysis of what is known of gel structure and function was performed. There are different ways of making gels, ranging from entangling of giant glycoproteins to crosslinking of smaller proteins. The mechanics of the gel depend largely on the size of the polymer, its co...

Abstract In the field of microelectronic packaging technology, isotropic conductive adhesives (ICAs) have been used widely as interconnection materials between chips and substrates. ICAs are composed silver powder particles adhesive matrix. The paper analysed rheological properties at different temperatures in order to better apply dispensing jet printing processes. viscosity, viscoelasticity, ...

Conventional pressure sensitive adhesives (PSAs) are fabricated from soft viscoelastic materials that satisfy Dahlquist's criterion for tack with a Young's modulus (E) of 100 kPa or less at room temperature and 1 Hz. In contrast, the adhesive on the toes of geckos is made of beta-keratin, a stiff material with E at least four orders of magnitude greater than the upper limit of Dahlquist's crite...

Metallic beams can be strengthened using fibre reinforced polymer (FRP) plates that are adhesively bonded to their soffit. This relies critically upon the adhesive joint, and because adhesives viscoelastic it is known creep at warm services temperatures potentially result in large slips reduce effectiveness of strengthening. paper examines impact performance an FRP-strengthened metallic beam wh...

Characterizing the mechanical properties of tissues is key for understanding fundamental biological processes such as morphogenesis or tumor progression. In particular, intercellular adhesion forces, mediated by transmembrane proteins like cadherins, are expected to control topology and viscoelastic behavior under stress. order understand influence in tissues, we use biomimetic emulsions which ...