%0 Conference Proceedings
%A Χατζητρύφων Νικόλαος Κ.
%I ΤΕΕ
%D 1997
%G Italian
%@ 960-7018-59-1
%@ 960-7018-61-3
%T Proposal for an experimental testing of bonding strength between mortar and brick
%U http://library.tee.gr/digital/rho/rho_book_465/rho_book_465_hatzitrifon.pdf
%X Geometry of mortar and brick construction in monumental masonry led to the development of a multitude of specimens for de-bonding strength of the two materials. All of them -overview in [3]-apply a tensile compression shear or a mixed mode loading condition on the bi-material specimens and use empirical fracture criteria, but they do not guarantee pure de-bonding. Moreover, their phenomenological theory is not able to explain a) why de-bonding usually appears along the interface of the two materials and b) the fracture procedure under environmental influences (humidity, pollution). Especially for monuments, an accurate knowledge of materials behaviour is important. The proposed specimen design is more deterministic, is able to give accurate stress and displacement conditions, is pliant to explain environmental fracture procedure and can be easily constructed. The design itself bases on the elastic fracture mechanics theory. According to this theory a body always contains defects, which are modelled as macro-or micro-cracks. This theory is able to express stresses and displacements around crack tips. For an interface crack a mathematical solution has been used witch is able to give pure tensional or shear de-bonding in the be-material interface for an appropriate relation of external applied loads. (AU)