The dynamic response of repaired composite beams under a harmonic peeling load was studied theoretically and experimentally. The repair method was based on removal of the damaged region and bonding a composite patch into the gap with adhesive. In the theoretical part, the equations of motion in the axial and transverse directions were derived assuming that the viscoelastic adhesive layer resist...

We present the first quantitative measurement of the receding contact angle between a soft viscoelastic material and a solid surface during the debonding of the material. We developed a new method of observation, based on the technique pioneered by Yamaguchi et al. (T. Yamaguchi, K. Koike, and M. Doi, Euro. Phys. Lett., 2007, 77, 64002). In a probe-tack geometry, we obtained a 3D-like view of t...

We study the packing of fine glass powders of mean particle diameter in the range (4-52) μm both experimentally and by numerical DEM simulations. We obtain quantitative agreement between the experimental and numerical results, if both types of attractive forces of particle interaction, adhesion and non-bonded van der Waals forces are taken into account. Our results suggest that considering only...

The retraction of a cylindrical rigid indenter from viscoelastic substrate is studied by means an efficient Green’s function method. Hysteresis observed in the load to area relationship accordance with experimental results. Although our model relaxes many assumptions posed LEFM-based analytical theories, results fall between limits, at high and low velocities, predicted theories. Approaching ve...

To develop and create effective vibration-damping composite polymer materials (VDСPM) with high viscoelastic strength properties, the choice of research objects to increase durability reduces vibration parts structures machines consequently, noise level in industrial premises is stated substantiated. A method described for studying adhesive strength, microhardness, impact coatings, compositions...

Adhesively bonding fibre reinforced polymer (FRP) plates have been a mainstream method for strengthening civil engineering structures. The effectiveness of is dependent on the performance adhesive layer. This study examines time-temperature viscoelasticity typical structural epoxy and develops linear viscoelastic material model that can be used numerical analysis. An accelerated test involving ...

When exploring immersed surfaces the cypris larvae of barnacles employ a tenacious and rapidly reversible adhesion mechanism to facilitate their characteristic 'walking' behaviour. Although of direct relevance to the fields of marine biofouling and bio-inspired adhesive development, the mechanism of temporary adhesion in cyprids remains poorly understood. Cyprids secrete deposits of a proteinac...