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Although spectacular advances in hydraulic fracturing, also known as fracking, have taken place and many aspects are well understood by now, the topology, geometry, and evolution of the crack system remain an enigma and mechanicians wonder: Why fracking works? Fracture mechanics of individual fluid-pressurized cracks has been clarified but the vital problem… (More)

- Marco Salviato, Kedar Kirane, Shiva Esna Ashari, Gianluca Cusatis
- 2016

Design of large composite structures requires understanding the scaling of their mechanical properties, an aspect often overlooked in the literature on composites. This contribution analyzes, experimentally and numerically, the intra-laminar size effect of textile composite structures. Test results of geometrically similar Single Edge Notched specimens made… (More)

- Kedar Kirane, Marco Salviato, Zdenek P. Bazant
- 2016

An accurate prediction of the orthotropic elastic constants of woven composites from the constituent properties can be achieved if the representative unit cell is subdivided into a large number of finite elements. But this would be prohibitive for microplane analysis of structures consisting of many representative unit cells when material damage alters the… (More)

The fiber bundle model is widely used in probabilistic modeling of various phenomena across different engineering fields, from network analysis to earthquake statistics. In structural strength analysis, this model is an essential part of extreme value statistics that governs the left tail of the cumulative probability density function of strength. Based on… (More)

Static and dynamic analysis of the fracture tests of fiber composites in hydraulically servo-controlled testing machines currently in use shows that their grips are much too soft and light for observing the postpeak softening. Based on static analysis based on the second law of thermodynamics, confirmed by dynamic analysis of the test setup as an open… (More)

- Z. P. Bažant, Mija H . Hubler, Marco Salviato
- 2014

In the present paper, a probabilistic generalization of the Type 2 size effect is proposed. The generalization is derived through a large size asymptotic expansion of LEFM equations combined with a weighted finite weakest-link model, which is justified by the fact that the structure survives if the crack tip location in any of a finite number of… (More)

Static and dynamic analysis of the fracture tests of fiber composites in hydraulically servo-controlled testing machines currently in use shows that their grips are much too soft and light for observing the postpeak softening. Based on static analysis based on the second law of thermodynamics, confirmed by dynamic analysis of the test setup as an open… (More)

- Daria Minucci, Angela Torrisi, Carlo-F Zambon, Marco Salviato
- European journal of gynaecological oncology
- 1987

The diagnostic problems of cervico-vaginal infections by HPV have been considered. The colposcopic and cytological diagnoses have been compared with the histological one in order to evaluate the diagnostic reliability of the two methods of screening, and to seek evidence of those colposcopic and cytological aspects which, even if not pathognomic, are… (More)

- Kedar Kirane, Marco Salviato
- 2016

A multiscale model based on the framework of microplane theory is developed to predict the elastic and fracturing behavior of woven composites from the mesoscale properties of the constituents and the weave architecture. The effective yarn properties are obtained by means of a simplified mesomechanical model of the yarn, based on a mixed series and parallel… (More)

This contribution investigates the extension of the microplane formulation to the description of transversely isotropic materials such as shale rock, foams, unidirectional composites, and ceramics. Two possible approaches are considered: 1) the spectral decomposition of the stiffness tensor to define the microplane constitutive laws in terms of… (More)