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Recent developments in brittle and quasi-brittle failure assessment of engineering materials by means of local approaches

机译：利用局部方法评估工程材料的脆性和准脆性破坏的最新进展

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Brittle failure of components weakened by cracks or sharp and blunt V-notches is a topic of active and continuous research. It is attractive for all researchers who face the problem of fracture of materials under different loading conditions and deals with a large number of applications in different engineering fields, not only with the mechanical one. This topic is significant in all the cases where intrinsic defects of the material or geometrical discontinuities give rise to localized stress concentration which, in brittle materials, may generate a crack leading to catastrophic failure or to a shortening of the assessed structural life. Whereas cracks are viewed as unpleasant entities in most engineering materials, U- and V-notches of different acuities are sometimes deliberately introduced in design and manufacturing of structural components. Dealing with brittle failure of notched components and summarizing some recent experimental results reported in the literature, the main aim of the present contribution is to present a review of some local approaches applicable near stress raisers both sharp and blunt. The reviewed criteria allowed the present authors to develop a new approach based on the volume strain energy density (SED). which has been recently applied to assess the brittle failure of a large number of materials. The main features of the SED approach are outlined in the paper and its peculiarities and advantages accurately underlined. Some examples of applications are reported, as well. The present review is based on the authors' experience over more than 15 years and the contents of their personal library. It is not a dispassionate literature survey.
机译：裂纹或尖锐的V型缺口削弱了组件的脆性失效，这是积极而持续的研究主题。它对所有在不同的载荷条件下面临材料断裂问题并不仅在机械领域而且在不同工程领域中都有大量应用的研究人员具有吸引力。在材料的固有缺陷或几何不连续性引起局部应力集中的所有情况下，该主题都是很重要的。在脆性材料中，局部应力集中可能会产生裂纹，导致灾难性破坏或缩短评估的结构寿命。尽管裂缝在大多数工程材料中被视为令人不快的实体，但有时会在结构构件的设计和制造中故意引入不同敏锐度的U型和V型槽口。处理缺口部件的脆性破坏，并总结文献中报道的一些最新实验结果，本论文的主要目的是对适用于应力产生器附近的一些局部方法进行综述，包括尖锐的和钝的。审查的标准允许本作者基于体积应变能密度（SED）开发一种新方法。最近已将其用于评估大量材料的脆性破坏。本文概述了SED方法的主要特征，并准确强调了其特殊性和优势。还报告了一些应用示例。本评论基于作者超过15年的经验及其个人图书馆的内容。这不是一个无懈可击的文献调查。

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