Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Cracks at mortar-stone interfaces
In split cube geometries the specific fracture energies of sandstone-mortar (14 Nm-1) and limestone-mortar (6 Nm-1) interfaces were determined. They are much lower than for bulk mortar (80 Nm-1). Thus geometric concentations of applied stress near inclusions must be avoided in structural concrete elements. It is shown that at the corner of a semi-elliptical inclusion damage occurs in the form of microcracking. This leads to the formation of a process zone at the crack tip wich consumes energy, leading to higher ductility and toughness. A damage type law describes well the development of the process zone around the interfacial cracks. In finite element calculations the damage law describes the behaviour of flat interfaces, but needs improvement for curved interfaces.
Cracks at mortar-stone interfaces
In split cube geometries the specific fracture energies of sandstone-mortar (14 Nm-1) and limestone-mortar (6 Nm-1) interfaces were determined. They are much lower than for bulk mortar (80 Nm-1). Thus geometric concentations of applied stress near inclusions must be avoided in structural concrete elements. It is shown that at the corner of a semi-elliptical inclusion damage occurs in the form of microcracking. This leads to the formation of a process zone at the crack tip wich consumes energy, leading to higher ductility and toughness. A damage type law describes well the development of the process zone around the interfacial cracks. In finite element calculations the damage law describes the behaviour of flat interfaces, but needs improvement for curved interfaces.
Cracks at mortar-stone interfaces
Risse in Stein-Mörtel-Grenzflächen
Tan, D.M. (Autor:in) / Tschegg, E.K. (Autor:in) / Rotter, H. (Autor:in) / Kirchner, H.O.K. (Autor:in)
Acta Metallurgica et Materialia ; 43 ; 3701-3707
1995
7 Seiten, 7 Bilder, 1 Tabelle, 39 Quellen
Aufsatz (Zeitschrift)
Englisch
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