Mechanics of material damage in concrete

Sih, G. C.

doi:10.1007/978-94-009-6149-4_1

Cited by 13 publications

(5 citation statements)

References 10 publications

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“…From Figure 10, it may be noted that at (P cr /2) itself there is a change in stiffness suggesting that the internal microcracks would have started coalescing ahead of notches resulting in a crack. A similar observation was reported in Reinhardt and Xu 11 and by Sih 19 (i.e. the micro-cracking starts at a load approximately equal to 50% of first visual cracking load).…”

Section: Load and Load-line Displacement Behaviorsupporting

confidence: 67%

Experimental investigations on mode II fracture of concrete with crushed granite stone fine aggregate replacing sand

2011

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With a view to implement sustainability concepts (namely, use of locally available materials and industrial by-products) in the concrete construction industry, the possibility of use of crushed stone fine aggregate as replacement to river sand is explored in this paper. Towards this, tests have been carried out on concrete cubes and concrete cylinders. The effect of variation in percentage replacement of river sand with crushed stone fine aggregate on the mechanical properties is studied. In order to popularize the locally available material for the construction of shear critical concrete structures (viz. flat slabs, foundation of heavy structures), the Mode -II fracture behavior of the considered concrete is studied using DCN (Double Central Notched) specimens with different notch to depth, (a/w), ratios of 0.3, 0.4, 0.5 and 0.6. For each (a/w) ratio five different percentage replacements (viz. 0, 25, 50, 75 and 100%) are considered. The study indicates that both cube compressive strength and split tensile strength increases with the increase in percentage replacement up to 50% and then gradually decreases. A similar observation was made with respect to the Mode -II fracture energy also. It is noted that the strengths of concrete even with 100% replacement are higher than the concrete with 0% replacement suggesting that the locally available crushed stone fine aggregate can be considered as an alternative to the river sand. Keywords: cushed stone fine aggregate, DCN (Double Central Notched) specimen, notch to depth ratio, Mode -II fracture energy

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Section: Load and Load-line Displacement Behaviorsupporting

confidence: 67%

Experimental investigations on mode II fracture of concrete with crushed granite stone fine aggregate replacing sand

2011

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“…According to symmetry,the conditions of the infinite and singularity of the crack tip [9] ，the sole solution of the Keldysh-Sedov problem (10) can be gained:…”

Section: The Problem That Crack Surface Subjected To Unit Step Loadmentioning

confidence: 99%

“…According to symmetry,the condition of infinite and singularity of the crack tip [9],the unique solution of Eq. ( 22) is:…”

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confidence: 99%

Dislocation Distribution Model of Mode I Dynamic Crack

Wang

2011

AMR

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Dislocation distribution functions of mode I dynamic crack subjected to two loads were studied by the methods of the theory of complex variable functions. By this way, the problems researched can be translated into Riemann-Hilbert problems and Keldysh-Sedov mixed boundary value problems. Analytical solutions of stresses, displacements and dynamic stress intensity factors were obtained by the measures of self-similar functions and corresponding differential and integral operation. The analytical solutions attained relate to the crack propagation velocity and time, but the solutions have nothing to the other parameters. In terms of the relationship between dislocation distribution functions and displacements, analytical solutions of dislocation distribution functions were gained, and variation rules of dislocation distribution functions were depicted.

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“…Predicción de un aumento de la fragilidad con el tamaño (efecto del tamaño), (Sih, 1984b(Sih, y 1985.…”

Section: Deformación Adimensional (6/b)x10^unclassified

“…Con este propósito se resume un estudio del comportamiento de una viga entallada de hormigón en masa (para más detalle ver Sih, 1984bSih, y 1985.…”

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Fractura del hormigón: métodos de cálculo numérico

Elices¹

1985

Inf. constr.

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450-17 RESUMEN INTRODUCCIÓNLas técnicas para el cálculo numérico de estructuras se han desarrollado vigorosamente durante estos últimos años: actualmente es posible calcular estructuras sofisticadas sometidas a complejos estados tensionales, a efectos térmicos o a la acción de un impacto. En paralelo con el desarrollo de las técnicas de cálculo ha surgido la demanda de modelos que caractericen el material de forma más refinada: teniendo en cuenta su comportamiento bajo estados multiaxiles, la influencia del tiempo -como en la fluencia y la relajación-, el deterioro y otros fenómenos.En relación con el hormigón, resulta cada vez más clara la necesidad de introducir su comportamiento a tracción para poder predecir algunos aspectos de elementos sometidos a flexión o a punzonamiento, o cuando se pretende modelizar la adherencia o el agotamiento. Como el comportamiento a tracción y la fisuración están relacionados, es natural que las técnicas de la Mecánica de la Fractura empiecen a incorporarse en las ecuaciones constitutivas del hormigón. El propósito de este artículo (*) Este trabajo está basado en una comunicación presentada durante el prímer Workshop tiispano-Británico de Ecuaciones Constitutivas en Ingeniería Civil, organizado por el CEDEX (MOPU). Madrid, septiembre, 1985 (M. Pastor et al.).es presentar un resumen de esta situación -la fractura del hormigón a tracción-y explorar las tendencias futuras.Al tratar de modelizar una fisura en el hormigón aparecen dos aspectos esenciales: el primero, es la forma de introducirla en la malla de los elementos finitos -ya que este método es el usual para abordar estos problemas-y el segundo aspecto es establecer un criterio para estimar el crecimiento y la dirección de las fisuras.Al comienzo, hace casi veinte años, las fisuras se modelaron discretamente (Ngo y Scordelis, 1967, Mufti y otros, 1970, es decir, la fisura se formaba al separar los bordes de dos elementos que antes eran comunes. Cuando la dirección de la trayectoria era conocida de antemano se podían prever nudos dobles a lo largo de los elementos que iban a configurar la fisura. Cuando la dirección no se conocía, todos los nudos eran dobles y solamente se desdoblan los que indicaba el criterio de fractura. Este planteamiento presentó, desde el principio, dos inconvenientes serios: dudas razonables sobre la influencia de la malla en la dirección de las fisuras y un enorme esfuerzo de cálculo que iba aumentando a medida que avanzaba la fisura -al aumentar el número de grados de libertad y la anchura de la matriz de rigidez-. Parte de estos in-© Consejo Superior de Investigaciones Científicas Licencia Creative Commons 3.0 España (by-nc)

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Mechanics of material damage in concrete

Cited by 13 publications

References 10 publications

Experimental investigations on mode II fracture of concrete with crushed granite stone fine aggregate replacing sand

Experimental investigations on mode II fracture of concrete with crushed granite stone fine aggregate replacing sand

Dislocation Distribution Model of Mode I Dynamic Crack

Fractura del hormigón: métodos de cálculo numérico

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