Bulk strain solitary waves in bonded layered polymeric bars with delamination

Abstract

We report the registration of delamination induced variations in the dynamics of bulk strain solitary waves in layered polymeric bars with the glassy and rubber-like adhesives, for the layers made of the same material. The key phenomenon in a layered structure with the glassy bonding is the delamination caused fission of a single incident soliton into a wave train of solitons, with the detectable increase in the amplitude of the leading solitary wave. The significant feature of bulk strain solitons in structures bonded with the rubber-like adhesive is the generation of radiating solitary waves, whilst co-propagating ripples disappear in the delaminated area. The observed variations may be used for the detection of delamination in lengthy layered structures.

Observation of bulk strain solitons in layered bars of different materials

“…It was estab lished that, in the case of an almost ideal contact (with elastic parameters of the adhesive close to those of the layer material), the main characteristics of solitary waves are almost the same as those in a homogeneous bar of the same material. In the case of a nonideal con tact (rubber like adhesives), the incident wave trans forms into a radiating solitary wave [3] in agreement with the proposed theory. We have also performed original experiments in order to confirm the existence and describe properties of bulk strain solitary waves in delaminated bars with extended cracks [3].…”

“…In the case of a nonideal con tact (rubber like adhesives), the incident wave trans forms into a radiating solitary wave [3] in agreement with the proposed theory. We have also performed original experiments in order to confirm the existence and describe properties of bulk strain solitary waves in delaminated bars with extended cracks [3]. It was found that the wave passage into a delaminated region leads to a 15-20% growth in the amplitude and the generation of a train of several solitary waves (depend ing on the number of layers), in complete agreement with the predictions of our theory [4].…”

“…Recently, we have carried out a series of experi mental and theoretical investigations of the evolution of bulk strain solitons in layered waveguides made of glassy polymers, including poly(methyl methacrylate) (PMMA), polystyrene (PS), and polycarbonate (see [1][2][3][4] and references therein). In particular, we have studied the evolution of bulk strain solitons in com pletely bonded bars at ideal and nonideal contact between layers and various adhesives [1].…”

Strain solitary waves in a thin-walled waveguide

“…3, we present the comparison of the variation of the strain soliton amplitude in the duct-like shell with our previous results for a PMMA uniform bar and three-layered PMMA bar bonded with CA. 5 The comparison shows that the strain soliton in the duct has a 15% smaller amplitude than the soliton in the bar, while the decay tendency during propagation along the waveguide is almost the same.…”

“…Soliton amplitude vs the distance from input for a duct-like shell compared with previous results for a uniform bar and a 3-layered bonded bar. 5 …”