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Keywords: elasticity, finite element, brittle fracture, non linear behaviour, local approach, numerical simulation, concrete, damage.

Summary

The progressive degradation of the mechanical properties of a broad class of materials (concrete, ceramics, rocks, pig iron and cast iron) is mainly due to the generation and the propagation of microdefauts inducing a nonlinear behavior, In order to describe the nonlinear deformation in these materials. This work consists of the development of a calculation programme able to simulate the deterioration of the structures and which will be in good agreement with the experimental results. This calculation programme solved by the finite element method working with an interface, for the evaluation of the characteristic mechanics (constraint's, deformations, displacements and intensity of the damage), and to envisage the appearance of macrofissures. The simulation, led to the rupture, makes it possible to identify the mode of failure of these structures [1,2]. One can thus observe that the mechanical damage is localised in the most stressed zone, the adopted laws give a good estimate of the damage and deformation during the loading. A model written as a function of deformation is proposed, identified on the basis of simple experiments by the definition of an equivalent deformation. Various applications to plates compared with corresponding experiments show that the algorithms developed make it possible to foresee with satisfactory accuracy the localization of the deterioration, including when they represent cracks.

References

1: J. Mazars, "Nouveau Concepts dans la Modélisation du Comportement du Béon Composite. Application au Calcul des Structures", No 461, January, Concrete 252, French Association of Concrete, Ann ITBTP, 1998.
2: D. Marquises, J. Lemaitre, "Constitutive Equations for Coupling between Elasto-Plasticity, Damage and Aging", Review Phys Appl, 23, 615-624, 1988. doi:10.1051/rphysap:01988002304061500

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Front Page Browse CCP CSETS CTR IJRT Other Authors Search Purchase Guide FAQ Contact us	Civil-Comp Proceedings ISSN 1759-3433 CCP: 88 PROCEEDINGS OF THE NINTH INTERNATIONAL CONFERENCE ON COMPUTATIONAL STRUCTURES TECHNOLOGY Edited by: B.H.V. Topping and M. Papadrakakis Paper 250 Simulation of Fragile Structures Using the Mechanics of Continuous Damage O. Bélaidi Chabane Chaouche¹, M. Almansba¹, Y. Labadi² and N.E. Hannachi¹ ¹Department of Civil Engineering, University Mouloud Mammeri of Tizi Ouzou, Algeria ²University of Technology of Troyes, France doi:10.4203/ccp.88.250 purchase the full-text of this paper Full Bibliographic Reference for this paper , "Simulation of Fragile Structures Using the Mechanics of Continuous Damage", in B.H.V. Topping, M. Papadrakakis, (Editors), "Proceedings of the Ninth International Conference on Computational Structures Technology", Civil-Comp Press, Stirlingshire, UK, Paper 250, 2008. doi:10.4203/ccp.88.250 Keywords: elasticity, finite element, brittle fracture, non linear behaviour, local approach, numerical simulation, concrete, damage. Summary The progressive degradation of the mechanical properties of a broad class of materials (concrete, ceramics, rocks, pig iron and cast iron) is mainly due to the generation and the propagation of microdefauts inducing a nonlinear behavior, In order to describe the nonlinear deformation in these materials. This work consists of the development of a calculation programme able to simulate the deterioration of the structures and which will be in good agreement with the experimental results. This calculation programme solved by the finite element method working with an interface, for the evaluation of the characteristic mechanics (constraint's, deformations, displacements and intensity of the damage), and to envisage the appearance of macrofissures. The simulation, led to the rupture, makes it possible to identify the mode of failure of these structures [1,2]. One can thus observe that the mechanical damage is localised in the most stressed zone, the adopted laws give a good estimate of the damage and deformation during the loading. A model written as a function of deformation is proposed, identified on the basis of simple experiments by the definition of an equivalent deformation. Various applications to plates compared with corresponding experiments show that the algorithms developed make it possible to foresee with satisfactory accuracy the localization of the deterioration, including when they represent cracks. References 1 J. Mazars, "Nouveau Concepts dans la Modélisation du Comportement du Béon Composite. Application au Calcul des Structures", No 461, January, Concrete 252, French Association of Concrete, Ann ITBTP, 1998. 2 D. Marquises, J. Lemaitre, "Constitutive Equations for Coupling between Elasto-Plasticity, Damage and Aging", Review Phys Appl, 23, 615-624, 1988. doi:10.1051/rphysap:01988002304061500 purchase the full-text of this paper (price £20) go to the previous paper go to the next paper return to the table of contents return to the book description purchase this book (price £145 +P&P)
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