Materials and Structures

, Volume 31, Issue 6, pp 428–432 | Cite as

Time-delayed rupture of stones under low tensile and bending stress states

  • Stefano Sorace
Technical Reports


The advancements of research dealing with the time-delayed behaviour of building stones are presented. In preceding papers, the results of long-term tensile and bending tests conducted on one type of Carrara marble, two sandstones, and one limestone were reported. A composite phenomenological model was also defined which permitted to suitably reproduce the recorded responses. In this paper, the tests carried out by applying the minimum percentile rate of the fracture loads (equal to 35%), having in the meantime arrived at completion, are described. The outcomes of these tests confirm the basic features of the creep response observed in the previous sections of the experimental programme. By updating the experimental time-to-rupture curves with reference to the new data, an asymptotic trend towards the elastic limit values of the materials is noted. A modified version of the time-to-rupture law associated with the tertiary branch of the phenomenological model is supplied, which allows to further improve the relevant prediction potentialities.


Fracture Load Building Stone Tertiary Creep Creep Response Tertiary Branch 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


On présente les progrès des recherches ayant comme objet le comportement à long terme des pierres naturelles à bâtir. Dans des articles précédents, on avait présenté les résultats des assais à long terme à la flexion et à la traction conduits sur un marbre de Carrare, deux grès et une pierre calcaire. Un modèle constitutif du genre phénoménologique a également été défini qui permet de reproduire analytiquement les réponses observées. Dans cet article, on présente des essais récemment terminés qui appliquent le taux minimal des charges de rupture (égal à 35%). Les résultats de ces essais confirment les plus importantes propriétés de la réponse au fluage précédemment observées. Une mise à jour, sur la base des nouvelles données, des courbes expérimentales du temps de rupture a permis de démontrer une démarche asymptotique vers les limites élastiques des matériaux. Une formulation modifiée, proposée ici, pour la loi des temps de rupture associée à la branche tertiaire du modèle phénoménologique permet d’améliorer ses capacités de prévision.


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  1. [1]
    Sorace, S., ‘Long-term tensile and bending strength of natural building stones’,Mater. Struct. 29 (1996) 426–435.MathSciNetGoogle Scholar
  2. [2]
    ‘Accettazione delle pietre naturali da costruzione’ (Italian Technical Standards, R.D. 16 November 1939, No. 2232).Google Scholar
  3. [3]
    Barber, D.J., ‘Regimes of plastic deformation—processes and microstructures: an overview’, in ‘Deformation Processes in Minerals, Ceramics and Rocks’, (Unwin Hyman, London, 1990) 138–178.Google Scholar
  4. [4]
    Oikawa, H., and Maruyama, K., ‘Prediction of long term creep curves’, in ‘Rheology of Solids and of the Earth’, (Oxford University Press, Oxford, 1989) 374–392.Google Scholar
  5. [5]
    Mogi, K., ‘Fracture and flow of rocks’,Tectonophysics 13 (1972) 541–568.CrossRefGoogle Scholar
  6. [6]
    Kachanov, L. M., ‘On the time to failure under creep conditions’ (in Russian),Izv. Akad. Nauk. SSR 8 (1958) 26–31.MATHGoogle Scholar
  7. [7]
    Rabotnov, Y. N., ‘Creep rupture’, Proceedings of 12th International Congress on Applied Mechanics, Stanford, September 1969, (Springer, Berlin, 1969) 137–144.Google Scholar
  8. [8]
    Sorace, S., ‘Creep in building stones under tensile conditions’,Journal of Engineering Materials and Technologies ASME 118 (1996) 456–462.CrossRefGoogle Scholar

Copyright information

© RILEM 1998

Authors and Affiliations

  • Stefano Sorace
    • 1
  1. 1.Institute of Energetics, Faculty of EngineeringUniversity of PerugiaPerugiaItaly

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