Author
Federico París
Other affiliations: Complutense University of Madrid, Oak Ridge National Laboratory
Bio: Federico París is an academic researcher from University of Seville. The author has contributed to research in topics: Boundary element method & Boundary (topology). The author has an hindex of 31, co-authored 184 publications receiving 3225 citations. Previous affiliations of Federico París include Complutense University of Madrid & Oak Ridge National Laboratory.
Papers published on a yearly basis
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TL;DR: In this article, the additive layer manufacturing (ALM) process is used in the present investigation to manufacture long fibre reinforced composite parts using the MarkOne® 3D-printer, and the results showed that the obtained mechanical properties for ALM composites are not yet comparable to those obtained by traditional methods (pre-pregs).
307 citations
Book•
01 Jan 1997
TL;DR: A computer program to solve 2D elasticity problems based on BEM is described in this article. But it is not suitable for solving 2D Laplace Equations, since it is computationally difficult.
Abstract: 1.: Preliminary concepts. 2.: Integral formulation of Laplace equation. 3.: BEM applied to Laplace equation. 4.: A computer program to solve 2D Laplace equation based on BEM. 5.: Integral formulation of the elastic problem. 6.: BEM applied to Elasticity Theory. 7.: A computer program to solve 2D elasticity problems based on BEM. Appendixes 1,2,3,4. Subject index
254 citations
TL;DR: In this paper, a single fiber surrounded by the matrix and with a partial debonding is studied, and it is shown that under uniaxial loading transversal to the fibers direction, the most significant phenomena appear for semidebonding angles in the interval between 60 deg and 70 deg.
Abstract: Under loads normal to the direction of the fibers, composites suffer failures that are known as matrix or interfiber failures, typically involving interface cracks between matrix and fibers, the coalescence of which originates macrocracks in the composite. The purpose of this paper is to develop a micromechanical model, using the boundary element method, to generate information aiming to explain and support the mechanism of appearance and propagation of the damage. To this end, a single fiber surrounded by the matrix and with a partial debonding is studied. It has been found that under uniaxial loading transversal to the fibers direction the most significant phenomena appear for semidebonding angles in the interval between 60 deg and 70 deg. After this interval the growth of the crack along the interface is stable (energy release rate (ERR) decreasing) in pure Mode II, whereas it is plausibly unstable in mixed mode (dominated by Mode I for semidebondings smaller than 30 deg) until it reaches the interval. At this interval the direction of maximum circumferential stress at the neighborhood of the crack tip is approximately normal to the applied load. If a crack corresponding to a debonding in this interval leaves the interface and penetrates into the matrix then: (a) the growth through the matrix is unstable in pure Mode I; (b) the value of the ERR reaches a maximum (in comparison with other debonding angles); and (c) the ERR is greater than that released if the crack continued growing along the interface. All this suggests that it is in this interval of semidebondings (60-70 deg) that conditions are most appropriate for an interface crack to kink. Experiments developed by the authors show an excellent agreement between the predictions generated in this paper and the evolution of the damage in an actual composite.
123 citations
TL;DR: In this paper, the inspection of damages detected in some blades of 300kW wind turbines revealed that the nature of these damages was probably due to a fatigue mechanism, and the causes that had originated the failure (superficial cracks, geometric concentrator, abrupt change of thickness) have been studied, verifying, by means of the simplified evaluation procedure of fatigue life of the Germanischer Lloyd (GL) standard, that these causes can explain the failure detected in the period of time in which it happened.
108 citations
TL;DR: In this paper, a micromechanical analysis is performed using the Boundary Element Method, allowing contact between the debonded surfaces of fiber and matrix, and different combinations of loads are applied to check their influence in the energy release rate, which is the fracture parameter evaluated.
104 citations
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1,191 citations
TL;DR: In this paper, the static and dynamic response of the functionally graded material (fgm) plates are investigated by varying the volume fraction of the ceramic and metallic constituents using a simple power law distribution.
1,026 citations
TL;DR: Sokolnikoff's book as discussed by the authors differs greatly from Southwell, Timoshenko, and Love in spirit and content, and is symptomatic of the change in outlook of American mathematics over the past few decades.
Abstract: THE appearance of a treatise in English upon the mathematical theory of elasticity is an event the potential importance of which may be judged by the that the author, in his frequent suggestions for collateral reading, refers to only three such, those of Southwell, Timoshenko, and Love. In spirit and content Sokolnikoff}s book differs greatly from each and all of these. It may be described by a possible sub-title: “A pure mathematician surveys topics related to certain problems in the mathematical theory of elasticity”. It is symptomatic of the change in outlook of American mathematics over the past few decades. Mathematical Theory Of Elasticity Prof. I. S. Sokolnikoff with the collaboration of Asst. Prof. R. D. Speche. Pp. xi + 373. (New York and London: McGraw-Hill Book Co., Inc., 1946.) 22s. 6d.
552 citations