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Prieto, María Antonia García; Fernández‐Canteli, Alfonso

doi:10.1023/a:1014228728063

Cited by 3 publications

(2 citation statements)

References 2 publications

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“…where w is the width of the bending test specimen, t its thickness, L and L o the dimensions shown in Figure 2; λ and β the Weibull parameters of the cdf of the maximal crack size, K Ic the fracture toughness of the material, P fr the failure load in the test and f 1 the geometrical factor belonging to the type of defect considered [4].…”

Section: Figure 2 Four-point Bending Testmentioning

confidence: 99%

A Design Model for Glass Elements Based on the Statistical Distribution of Crack Sizes

García-Prieto

Canteli

Lamela³

et al. 2004

KEM

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A probabilistic model for the design of building glazing plates of monolithic glass in buildings is presented here. The model is implemented for practical use in Windesign, a computer program developed by the authors. A novel contribution of the model is the consideration of maximal crack sizes as a reference parameter to predict material fracture instead of the critical strengths of the materials, as is usually the case. A sensitivity analysis is also included to assess the relative influence of the different parameters on the model.

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Section: Figure 2 Four-point Bending Testmentioning

confidence: 99%

A Design Model for Glass Elements Based on the Statistical Distribution of Crack Sizes

García-Prieto

Canteli

Lamela³

et al. 2004

KEM

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“…It is commonly accepted that the brittleness of glass elements is caused by the presence of superficial micro-cracks formed during the manufacturing or manipulating processes. Any probability model used in design requires the statistical distribution of the maximum crack size [1] or of the critical stress [2], as a possible alternative. This characterization succeeds experimentally when testing circular glass plates until failure under concentrated central load, or small glass beams, tested under 4-or 3-point bending loads, extracted from on-going production.…”

Section: Introductionmentioning

confidence: 99%

Strength Characterization of Glass by Means of the Statistical Theory of Confounded Data

Castillo

Canteli

García-Prieto

et al. 2004

KEM

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A central point in a probabilistic model for designing brittle materials is how to analytically determine the statistical distribution of the critical strength from experimental data. The cutting process used in the preparation of specimens is frequently the source of edge defects causing failures at stresses generally lower than those that have originated from micro-cracks at the surface. Since this kind of failure occurs almost exclusively in certain testing procedures but is not present in the real, edge-polished glazing elements, adequate treatment of this data is needed to derive the cumulative distribution function (cdf) characterizing the surface strength of the material. Neglecting data associated with the edge failures results in an erroneous estimation of the cdf. This paper describes the statistical procedure for the evaluation of this kind of data (known as confounded data) that permits the correct estimation of the cdf of the surface strength taking into account all the results obtained in the tests, irrespective of their origin. The theoretical model is applied to experimental data resulting from 4-point bending tests on glass specimens.

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Production of highly aligned collagen lamellae by combining shear force and thin film confinement

et al. 2011

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Load-bearing tissues owe their mechanical strength to their highly-anisotropic collagenous structure. To date, attempts to engineer mechanically strong connective tissue have failed mainly due to the lack of the ability to reproduce native collagen organization in constructs synthesized by cultured cells in vitro. The ability to influence the direction of the self-assembling collagen molecules and produce highly anisotropic structures has applications ranging from de novo engineering of complex tissues to the production of organized scaffolds for cell culture contact guidance. In this investigation we have used the simple technique of spin coating to produce highly-aligned arrays of collagen fibrils. By a simple modification of the method we have also successfully produced orthogonal collagen lamellae. Alternating collagen lamellae are frequently seen in load-bearing tissues such as cornea, annulus fibrosus, and cortical bone. Culturing of corneal fibroblasts onto aligned collagen shows that the cells adopt the organization of the fibrils. In this investigation, we observed the reversal of fibrillar growth direction or “hook” formation similar to those seen previously in a microfluidic shear-flow chamber. Although the results of this investigation clearly show that it is possible to produce small areas (O) 1 cm2 of collagen fibrils with enough alignment to guide fibroblasts, there is evidence that thin film instabilities are likely to be a significant barrier to producing organized collagen fibrils over larger areas. Successful application of this method to produce highly-controlled and organized collagenous structures will require the development of techniques to control thin film instability and will be the subject of the future work.

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Cited by 3 publications

References 2 publications

A Design Model for Glass Elements Based on the Statistical Distribution of Crack Sizes

A Design Model for Glass Elements Based on the Statistical Distribution of Crack Sizes

Strength Characterization of Glass by Means of the Statistical Theory of Confounded Data

Production of highly aligned collagen lamellae by combining shear force and thin film confinement

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