Wall shear stress on an elastic boundary or structure
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The stresses induced by a cavitation bubble on an elastic boundary is studied experimentally and numerically. Experimentally we tracked the displacement of embedded particles on an elastic layer and the deformation of an elastic ring strucutre. The corresponding simulations are done with Volume-of-Fluid solver in OpenFOAM. Good agreement between the experiments and simulation is found in terms of bubble dynamics and particle displacement or structural deformation. This lends credibility to the stresses calculated. We found a highest wall shear stress of 250 kPa at a bubble stand-off distance of 1.1*Rmax (maximum bubble radius). The largest overall shear stress of 1.9 MPa is found, however, whithin the elastic layer. Thus fracture may start whin the elastic material rather than on its surface which is nearer to the collapsing bubble.