【摘要】：基于泛形有限整數(shù)維測度,提出了材料泛形斷裂能概念,并直接得到了傳統(tǒng)斷裂能的尺寸效應(yīng)。將其應(yīng)用于混凝土,泛形斷裂能的數(shù)值結(jié)果與通過斷裂韌性計算得到的臨界應(yīng)變能釋放率基本一致。研究結(jié)果表明:材料表面能仍是材料斷裂行為的主導(dǎo)因素,因而泛形斷裂能可作為混凝土斷裂性質(zhì)的表征參數(shù),為長期以來存在的傳統(tǒng)斷裂能與臨界應(yīng)變能釋放率的計算結(jié)果不一致的困惑提供了一個合理的解釋。此外,計算結(jié)果顯示混凝土的泛形斷裂能不存在尺寸效應(yīng)。
[Abstract]:Based on the panoramic finite integer dimension measure, the concept of panoramic fracture energy is proposed, and the size effect of traditional fracture energy is obtained directly. When applied to concrete, the numerical results of panoramic fracture energy are consistent with the critical strain energy release rate obtained by fracture toughness calculation. The results show that the surface energy of the material is still the dominant factor in the fracture behavior of the material, so the panoramic fracture energy can be used as the parameter of the fracture properties of concrete. It provides a reasonable explanation for the confusion that the calculation results of the traditional fracture energy and the critical strain energy release rate are inconsistent for a long time. In addition, the results show that there is no size effect in the panoramic fracture energy of concrete.
【作者單位】： 北京理工大學(xué)爆炸科學(xué)與技術(shù)國家重點實驗室;
【基金】：國家自然科學(xué)基金項目(11221202;11390362)
【分類號】：TU528

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