NDLI: Strain rate dependent strength and stress–strain characteristics of a welded tuff

Content Provider	Springer Nature Link
Author	Ma, L. Daemen, J. J. K.
Copyright Year	2006
Abstract	Results of 61 uniaxial compression tests on the welded Topopah Spring tuff are presented. The tests were carried out under constant strain rates at room temperature. Stress–strain analysis indicates that dilatancy and compaction start at about 50% of ultimate strength. A sudden stress drop occurs at about 90% of the ultimate strength, which indicates the onset of specimen failure. Both strength and peak axial strain decrease with strain rate as power functions. Based on the strain rate dependence of strength and peak axial strain, it is inferred that the elastic modulus is strain rate dependent. A relationship between stress, axial strain, and axial strain rate is developed. The parameters in this relation are estimated using multivariate regression to fit stress–axial strain–strain rate data.Les résultats de 61 essais de compression simple sur les ignimbrites de Topopah Spring sont présentés. Les essais ont été réalisés avec une vitesse de déformation constante à la température du laboratoire. L’analyse en contrainte-déformation montre que la dilatance ou la contractance commence à environ 50% de la résistance ultime. Une chute brutale de résistance apparaît à environ 90% de la résistance ultime, ce qui rend compte de l’initiation de la rupture de l’échantillon. A la fois la résistance ultime et la déformation au pic de résistance diminuent avec la vitesse de déformation suivant des fonctions puissance. Sur la base de ces observations, il est conclu que le module d’élasticité dépend de la vitesse de déformation. Une relation entre contrainte, déformation axiale et vitesse de déformation axiale est mise en évidence. Les paramètres intervenant dans cette relation sont estimés à partir des techniques de régression linéaire sur les données expérimentales.
Starting Page	221
Ending Page	230
Page Count	10
File Format	PDF
ISSN	14359529
Journal	Bulletin of the International Association of Engineering Geology - Bulletin de l'Association Internationale de Géologie de l'Ingénieur
Volume Number	65
Issue Number	3
e-ISSN	14359537
Language	English
Publisher	Springer-Verlag
Publisher Date	2006-01-25
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Ignimbrites Essais de compression simple Paramètres mécaniques Nature Conservation Geoecology/Natural Processes Structural Foundations, Hydraulic Engineering Applied Geosciences
Content Type	Text
Resource Type	Article
Subject	Geology Geotechnical Engineering and Engineering Geology

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