Author
M. K. Kassir
Other affiliations: Rangsit University
Bio: M. K. Kassir is an academic researcher from City University of New York. The author has contributed to research in topics: Stress intensity factor & Fracture mechanics. The author has an hindex of 16, co-authored 28 publications receiving 735 citations. Previous affiliations of M. K. Kassir include Rangsit University.
Papers
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TL;DR: In this article, a closed-form solution is developed to predict the corrosion initiation time of reinforced concrete bridge decks using measured time varying surface chloride accumulations, and the results are compared to the constant surface accumulation model commonly used in the literature.
148 citations
98 citations
64 citations
TL;DR: In this article, the mixed boundary-value problem of a welded (and smooth) surface footing is reduced to a set of coupled Fredholm integral equations of the first kind and a numerical solution is provided.
47 citations
TL;DR: In this article, an integral transform technique is employed to solve the plane elastodynamic problem of a crack of fixed length propagating at a constant speed in a uniformly stressed medium, assuming that the crack is located in a plane of elastic symmetry of the material.
45 citations
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TL;DR: In this article, the authors considered the plane elasticity problem for a nonhomogeneous medium containing a crack and derived the integral equation having the derivative of the crack surface displacement as the density function.
Abstract: The plane elasticity problem for a nonhomogeneous medium containing a crack is considered. It is assumed that the Poisson's ratio of the medium is constant and the Young's modulus E varies exponentially with the coordinate parallel to the crack. First the half plane problem is formulated and the solution is given for arbitrary tractions along the boundary. Then the integral equation for the crack problem is derived. It is shown that the integral equation having the derivative of the crack surface displacement as the density function has a simple Cauchy type kernel. Hence, its solution and the stresses around the crack tips have the conventional square root singularity. The solution is given for various loading conditions. The results show that the effect of the Poisson's ratio and consequently that of the thickness constraint on the stress intensity factors are rather negligible.
711 citations
555 citations
TL;DR: In this article, the elastic stress and displacement fields near a crack tip in a two-dimensional nonhomogeneous cracked body are derived utilizing an extension of the Wiliams eigenfunction expansion technique.
Abstract: The nonhomogeneous materials considered in this work are of a class whose elastic moduli are specified by continuous and generally differentiable functions of the spatial coordinates. The elastic stress and displacement fields near a crack tip in a two-dimensional nonhomogeneous cracked body are derived utilizing an extension of the Wiliams eigenfunction expansion technique. The nature of the stress and strain singularity is ascertained to be precisely of the same form as the well-known inverse square root stress singularity near a crack tip in a homogeneous material, independent of the functional form of the elastic moduli variation. A new quasipath-independent integral has been generated which proves useful for computing the energy release rate and mixed-mode stress intensity factors in nonhomogeneous cracked bodies. The integral is used in conjunction with finite element analysis for purposes of computing stress intensity factors. Numerical results are compared with certain exact solutions which are available for nonhomogeneous cracked bodies. Cracked composite bodies have traditionally been modeled and analyzed as possessing discontinuous elastic moduli, but are treated here as having rapid, but smooth variations of the material properties.
346 citations
TL;DR: In this paper, the authors provide state-of-the-art information on the following aspects of seismic analysis and design of spread footings supporting bridge piers: (1) obtaining the dynamic stiffness (springs and dashpots) of the foundation; (2) computing the kinematic response; determining the conditions under which foundation compliance must be incorporated in dynamic structural analysis; assessing the importance of properly modeling the effect of embedment; elucidating the conditions in which the effects of radiation damping is significant.
284 citations
TL;DR: In this article, a nonhomogeneous elastic medium containing a crack arbitrarily oriented with respect to the direction of property gradient is considered, and the problem is solved under plane strain or generalized plane stress conditions.
253 citations