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José María Benítez

Publications and source records attributed to José María Benítez.

2 recordsLinked to original sources

Augmented Structure Preserving Neural Networks for cell biomechanics

Cell biomechanics involve a great number of complex phenomena that are fundamental to the evolution of life itself and other associated processes, ranging from the very early stages of embryo-genesis to the maintenance of damaged structures or the growth of tumors. Given the importance of such phenomena, increasing research has been dedicated to their understanding, but the many interactions between them and their influence on the decisions of cells as a collective network or cluster remain unclear. We present a new approach that combines Structure Preserving Neural Networks, which study cell movements as a purely mechanical system, with other Machine Learning tools (Artificial Neural Networks), which allow taking into consideration environmental factors that can be directly deduced from an experiment with Computer Vision techniques. This new model, tested on simulated and real cell migration cases, predicts complete cell trajectories following a roll-out policy with a high level of accuracy. This work also includes a mitosis event prediction model based on Neural Networks architectures which makes use of the same observed features.

cs.CV↗

Data-driven, structure-based hyperelastic manifolds: A macro-micro-macro approach

In this paper we introduce a novel approach to obtain the stored energy density of rubber-like materials directly from experimental data. The model is structure-based, in which the only assumption is the existence of an isotropic distribution of fibres, chains or networks. Using a single macroscopic test, we obtain the response of the constituents simply by solving a linear system of equations. This response includes all possible interactions, without an assumption on the nature of that behavior, performing an efficient reverse-engineering of the constituents behavior. With that microstructural behavior, we build constitutive manifolds capable of reproducing accurately the behavior of the continuum under any arbitrary loading condition. To demonstrate the goodness of the proposed non-parametric macro-micro-macro approach, using just one of the macroscopic test curves of the Kawabata et al experiments to compute the fiber (micro) behavior, we reproduce, to very good accuracy, the rest of the series of biaxial tests from Kawabata on vulcanized rubber 8phr sulfur, showing that the computed micromechanical behavior represents an excellent approximation of the actual behavior. We show similar results for the Treloar material and for the Kawamura et al series of experiments on silicone. With the use of constitutive manifolds, the method has similar efficiency in finite element programs to that of analytical models. Julia language code to reproduce the main computations and some figures of the paper is available.

cond-mat.mtrl-sci↗