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Cracked bi-material structure subjected to monotanically increasing thermal loading. Determination of the interfacial shear and peeling stresses

Nikolova G., Ivanova J.

Journal of Theoretical and Applied Mechanics

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2015

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Vol. 53 nr 4

1019--1028

EN

A modified analytical shear lag model is used for the evaluation of the interfacial shear and peeling stresses in a cracked bi-material structure composed of two elastic plates bonded together by an interface zero thickness material and subjected to monotonically increasing thermal loading. The “peeling” stress can be determined by the aid of the interfacial shear stress and is proportional to deflections of the thinner plate of the structure. The interface is assumed to exhibit brittle failure when the shear stress reaches the critical value. The analytical solution and the length of the debonding and intact zones as well as the interfacial shear and peeling stresses for given material properties and thermal loading are discussed and illustrated in figures.

2

Interfacial shear and peeling stresses in a two-plate structure subjected to monotanically increasing thermal loading

Nikolova G., Ivanova J.

Journal of Theoretical and Applied Mechanics

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2013

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Vol. 51 nr 4

937--947

EN

An approximate analytical model is developed for the evaluation of the interfacial shear and peeling stresses in a bi-material element composed of two elastic plates bonded together by an interface zero thickness material and subjected to monotonically increasing thermal loading. Thermal peeling stress is caused by thermal and elastic mismatch of a two-plate structure undergo a temperature change. The “peeling” stress can be determined from the evaluated interfacial shear stress and is proportional to deflections of the thinner plate of the structure, i.e. to its displacements with respect to the thicker plate. The interface is assumed to exhibit brittle failure at the critical shear stress value. The analytical solution qualitatively shows delamination and ultimate failure. The results are illustrated in figures and discussed.

3

Comparison of two approaches for calculation of the geometric and inertial characteristics of the human body of the Bulgarian population

Nikolova G., Toshev Y.

Acta of Bioengineering and Biomechanics

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2008

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Vol. 10, nr 1

3-8

EN

On the basis of a representative anthropological investigation of 5290 individuals (2435 males and 2855 females) of the Bulgarian population at the age of 30–40 years (YORDANOV et al. [1]) we proposed a 3D biomechanical model of human body of the average Bulgarian male and female and compared two different possible approaches to calculate analytically and to evaluate numerically the corresponding geometric and inertial characteristics of all the segments of the body. In the framework of the first approach, we calculated the positions of the centres of mass of the segments of human body as well as their inertial characteristics merely by using the initial original anthropometrical data, while in the second approach we adjusted the data by using the method based on regression equations. Wherever possible, we presented a comparison of our data with those available in the literature on other Caucasians and determined in which cases the use of which approach is more reliable.