Abstract
We quantitatively analyze the dynamic fracture of a glass tube under bending and model the associated generation of acoustic emissions. In our experiments, precisely controlled dynamic fracture is induced by focusing flexural waves. High-speed videos show the crack propagating rapidly through 85% of the cross section, before slowing down considerably. The resulting acoustic emissions are modeled by computing the diffraction of the incident flexural waves at the traction-free crack surface. We observe that longitudinal and flexural waves are generated during the fracture process, with very good agreement between experiments and simulations.
Highlights
During a fracture process, stress waves are generated that propagate in the surrounding body
We studied and modeled the acoustic emissions produced during the dynamic fracture of a glass tube under bending
Dynamic fracture was induced by focusing flexural waves to a high-amplitude, localized bending-moment pulse
Summary
Stress waves are generated that propagate in the surrounding body Often, these stress waves are referred to as acoustic emissions (AE), which is a wider term for elastic waves in solids that are generated through sudden or continuous stress redistribution (Grosse et al, 2008). The quantitative interpretation of single acoustic emissions requires understanding of the propagation of the wave from source to receiver, and of the underlying fracture mechanisms that produce the AE. This is the main reason why the quantitative analysis of AEs remains challenging
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