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Behaviour of cementitious matrix composites under displacement controlled cyclic loading
Under cyclic loading ruptures may occur at a stress lower than the maximum permissible for static loading. This phenomenon-fatigue-leads to rupture after a number of cycles if the stress amplitude is higher than the fatigue limit. The number of cycles until final rupture is composed of two phases: initiation of a defect and its propagation until final rupture. Fatigue rupture is a function of a large number of factors, such as surface quality, temperature, type and rate of loading, for example. They justify a large scatter and the need for a statistical characterization of the fatigue limit. Some material, such as concrete, do not display a fatigue limit, and their fatigue strength is conventionally defined at a given number of cycles such as 106. For cementitious matrix composites, in the presence of sand and other aggregates, behaviour is markedly non-linear, and progressive growth of fissures substitutes catastrophic rupture. The slow growth is reinforced by the presence of fibres, which anchor the fissures, namely through the creation of fibre-bridges, subjecting fibres to a pull-out process whereby fibres break or are extracted from the matrix. Analysis of cyclic behaviour may be carried out quantifying the accumulated irreversible damage. After developing a machine for displacement controlled cyclic testing, the authors studied the behaviour of cementitious matrix composites under this type of loading, particularly stress range and modulus as a function of number of cycles.
Behaviour of cementitious matrix composites under displacement controlled cyclic loading
Under cyclic loading ruptures may occur at a stress lower than the maximum permissible for static loading. This phenomenon-fatigue-leads to rupture after a number of cycles if the stress amplitude is higher than the fatigue limit. The number of cycles until final rupture is composed of two phases: initiation of a defect and its propagation until final rupture. Fatigue rupture is a function of a large number of factors, such as surface quality, temperature, type and rate of loading, for example. They justify a large scatter and the need for a statistical characterization of the fatigue limit. Some material, such as concrete, do not display a fatigue limit, and their fatigue strength is conventionally defined at a given number of cycles such as 106. For cementitious matrix composites, in the presence of sand and other aggregates, behaviour is markedly non-linear, and progressive growth of fissures substitutes catastrophic rupture. The slow growth is reinforced by the presence of fibres, which anchor the fissures, namely through the creation of fibre-bridges, subjecting fibres to a pull-out process whereby fibres break or are extracted from the matrix. Analysis of cyclic behaviour may be carried out quantifying the accumulated irreversible damage. After developing a machine for displacement controlled cyclic testing, the authors studied the behaviour of cementitious matrix composites under this type of loading, particularly stress range and modulus as a function of number of cycles.
Behaviour of cementitious matrix composites under displacement controlled cyclic loading
Verhalten von Verbundwerkstoffen mit Zementmatrix bei zyklischer Belastung mit wegkontrollierter zyklischer Belastung
Magalhaes, A.G. (author) / Marques, A.T. (author) / Oliveira, F. (author) / Soukatchoff, P. (author) / Castro, P.T. de (author)
1993
8 Seiten, 21 Bilder, 4 Quellen
Conference paper
English
Zement , Faserverstärkung , Materialermüdung , Lastwechsel (Lastspiel) , Rissbildung , Rissausbreitung , Materialbruch , Beton , Nichtlinearität , Rissgeschwindigkeit , Rissstillstand , Schadensakkumulation , Prüfmaschine , faserverstärkter Werkstoff , Ermüdung , zyklische Belastung , Geschwindigkeit , Faserbruch
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