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首页> 外文期刊>Bulletin des Laboratoires des Ponts et Chaussees >Mecanismes d'endommagement d'un composite cimentaire fibre multi-echelles II. Endommagement en fatigue
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Mecanismes d'endommagement d'un composite cimentaire fibre multi-echelles II. Endommagement en fatigue

机译:多尺度纤维水泥复合材料的破坏机理II。疲劳损伤

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摘要

In this article is proposed an analysis of the successive steps of the damage process relative to a multi-scales fibre reinforced composite tested under bending fatigue. It appears that the fatigue endurance is limited by the weak slenderness ratio of intermediate fibers (i.e., meso-fibres). A strong correlation exists between the fatigue-life and the initial damage (i.e., 1st static loading). A corrected Wohler curve is determined, knowing the characteristic static behavior and the initial damage of the specimen tested. The endurance limit defined in this case is 65 % of the characteristic modulus of rupture. Below this loading rate, pseudo-accomodation of the composite is possible, and the damage accumulation can stop. That marks a change in the phenomenon of energy dissipation. The energy brought to the composite is then dissipated, not to allow crack propagation into the matrix, but to amplify debonding along the matrix-fibre interfaces.
机译:本文提出了相对于在弯曲疲劳下测试的多尺度纤维增强复合材料的破坏过程的后续步骤的分析。似乎疲劳强度受到中间纤维(即中纤)的细长比的限制。疲劳寿命和初始损伤(即第一静态载荷)之间存在很强的相关性。确定了校正后的Wohler曲线,知道其静态特性和被测样品的初始损伤。在这种情况下定义的耐久性极限是特征断裂模量的65%。低于此加载速率,复合材料可能会出现假容纳,并且损伤累积会停止。这标志着能量耗散现象的改变。然后消散带入复合材料的能量,以免裂纹扩展到基体中,而是放大沿基体-纤维界面的剥离。

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