14 June 1995 Real-time shearing interferometry for studying interfacial crack tip fields under quasi-static and dynamic loading conditions
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Abstract
A real-time dual grating shearing interferometer with an online spatial filtering arrangement has been applied for interfacial fracture mechanics investigation. This optical technique, called coherent gradient sensing (CGS) measures out-of-plane slopes when used in the reflective mode with opaque objects and in-plane gradients of ((sigma) x + (sigma) y) when used in the transmission mode with phase objects. The attributes such as real-time measurements, simplicity of the optical set-up, and the relative insensitivity for rigid motions/vibrations are useful in mapping deformation fields to study the failure of dissimilar material interfaces subjected to quasi-static as well as dynamic loading. Here, large elastic mismatch bimaterial systems such as polymer-metal interfaces between model materials (PMMA and Aluminum) are considered. The crack tip fields are mapped using CGS and fracture parameters are subsequently quantified by analyzing the interference patterns. A linear relationship between the remote load mixity and the crack tip mixity is observed. Crack tip parameters are examined under quasi-static conditions for a wide range of remote field loading ratios of shear and tension. Also, low velocity impact loading experiments are conducted to study transient crack tip fields using CGS and high speed photography, and dynamic fracture parameters are extracted from the fringes.
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Hareesh V. Tippur, Hareesh V. Tippur, Liming Xu, Liming Xu, } "Real-time shearing interferometry for studying interfacial crack tip fields under quasi-static and dynamic loading conditions", Proc. SPIE 2544, Interferometry VII: Techniques and Analysis, (14 June 1995); doi: 10.1117/12.211883; https://doi.org/10.1117/12.211883
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