Precracking and interfacial delamination in a bi-material structure: Static and dynamic loadings |
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Authors: | Email author" target="_blank">Barbara?GambinEmail author Jordanka?Ivanova Varbinka?Valeva Gergana?Nikolova |
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Institution: | (1) U.S. Steel Research, Monroeville, PA 15146, USA;(2) Case Western Reserve University, Cleveland, OH 44106-7204, USA;(3) Present address: TMS, Warrendale, PA 15086, USA;(4) Department of Materials Science and Engineering, Case School of Engineering, Case Western Reserve University, Cleveland, OH 44106-7204, USA;(5) Department of Design and Production Engineering, Ain Shams University, Cairo, Egypt;; |
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Abstract: | The behavior of a precracked bi-material structure interface under given static and dynamic axial loading is an interest object
in the present paper. Firstly, it is shown that the shear-lag model is a proper tool to analyze a delamination process in
a precracked bi-material structure undergoing static loading. Secondly, the “shear-lag model” is applied to the structure
under dynamic loading. To solve the problem for an interface delamination of the structure and to determine the debond length
along the interface, our own 2D boundary element method (BEM) code is proposed in the case of static loading, and the shear-lag
model together with the Laplace transforms and half-analytical calculations are used in the case of dynamic loading. The interface
layer is assumed as a very thin plate compared with the other two. The parametric (geometric and elastic) analysis of the
debond length and interface shear stress is done. The results from the 2D BEM code proved the validity of analytical solutions
to the shear-lag model. In the dynamic case, the influence of loading characteristics, i.e., frequencies and amplitude fluctuations
on the shear stress and the value of debond length for an interval of time, is discussed. The analysis of the obtained results
is illustrated by an example of the modern ceramic-metal composite, namely cermet, and depicted in figures. |
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Keywords: | Debond length · Precracked bi-material structure · Shear-lag model · Delamination · BEM |
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