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首页> 外文会议>17th European conference on fracture : Multilevel approach to fracture of materials, components and structures : Book of abstracts amp; proceedings on CD ROM >Strength reduction produced by shallow notches: an asymptoticmatching approach
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Strength reduction produced by shallow notches: an asymptoticmatching approach

机译：浅槽口导致的强度降低：一种渐近匹配方法

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Fracture in quasi-brittle material specimens with V-notches is satisfactorily describedrnassuming as governing parameter the generalized (or notch) stress intensity factor, whosernanomalous physical dimensions depend on the notch opening angle. Its critical value, I.e. therngeneralized toughness, can then be linked to the material strength and toughness according to arnnumber of fracture criteria available in the literature. However, all these criteria provide an infiniternfailure load as the notch depth tends to zero, this undesirable property being shared with LEFM.rnAim of the present paper is to overcome this shortcoming. The analysis of the notched specimens isrncarried out by means of a multiscale approach according to which the problem is solved separatelyrnin the region far away from the notch (the outer field) and in the region close to the notch (the innerrnfield). Hence the asymptotic matching technique can be exploited to achieve the overall solution.rnThe results are finally compared with experiments performed on polystyrene specimens.
机译：满意地描述了具有V型缺口的准脆性材料试样的断裂，并以广义（或缺口）应力强度因子作为控制参数，该应力强度因子的纳米物理尺寸取决于缺口的张开角度。它的关键价值，即然后，可以根据文献中可用的断裂标准数目，将一般化的韧性与材料强度和韧性相关联。然而，随着切口深度趋向于零，所有这些标准都提供了无限的失效载荷，这种不希望的特性与LEFM共享。本文的目的是要克服这一缺点。通过多尺度方法进行带缺口试样的分析，根据该方法，在远离缺口的区域（外场）和靠近缺口的区域（内场）分别解决问题。因此，可以采用渐近匹配技术来获得整体解决方案。最后将结果与在聚苯乙烯样品上进行的实验进行比较。

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