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首页> 外文期刊>International Journal of Solids and Structures >DYNAMIC MIXED MODE FRACTURE OF CONCRETE
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DYNAMIC MIXED MODE FRACTURE OF CONCRETE

机译：混凝土的动态混合模式断裂

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The transient moire fringe patterns surrounding a rapidly propagating crack in an impacted three-point bend concrete specimen with an offset precrack were recorded by two IMACON 790 ultra-high speed framing cameras. The fracture parameters associated with this mixed mode fracture event were determined by driving a dynamic finite element model of the concrete specimen in its application mode with the recorded load and the crack propagation histories. The fracture process zone (FPZ), which trails the rapidly propagating crack, was characterized and the mixed modes I and II dynamic stress intensity factors were determined. The fracture energy dissipated at the FPZ increased with crack extension and reached a constant dissipation rate toward the final phase of fracture. Under mixed mode loading, the crack kinked and propagated according to the Ramulu-Kobayashi criterion. [References: 36]
机译：由两个IMACON 790超高速成帧相机记录了在具有偏置预裂纹的受冲击三点弯曲混凝土试样中，迅速蔓延的裂纹周围的瞬态莫尔条纹图案。通过驱动混凝土试件在其应用模式下的动态有限元模型并记录载荷和裂纹扩展历史，可以确定与此混合模式断裂事件相关的断裂参数。表征了沿着快速扩展的裂纹延伸的断裂过程区（FPZ），并确定了混合模式I和II动态应力强度因子。 FPZ处的断裂能随着裂纹扩展而增加，并在断裂的最后阶段达到恒定的耗散率。在混合模式载荷下，裂纹根据Ramulu-Kobayashi准则弯折并扩展。 [参考：36]

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