脆性泡沫中反裂纹型断裂的基于近场动力学的模型
Peridynamics based model of anticrack-type fracture in brittle foams
AI总结：
针对脆性多孔材料在单轴压缩下的反裂纹扩展问题，提出基于键近场动力学并以随机删键表征孔隙率的计算模型，并用于硅酸盐泡沫实验数据。
摘要：
高孔隙率脆性材料的一种特殊失效模式，是在单轴压缩载荷下发生裂纹扩展。这种“反裂纹”已在从雪、多孔砂岩到脆性泡沫的一系列材料中被观察到。本文在基于键的近场动力学这一通用计算框架内，提出了一个用于多孔材料中反裂纹型失效形成与扩展的计算模型。在远高于特征孔隙尺寸的尺度上，随机孔隙率通过随机删除键（稀释无序）来表示。我们将该框架应用于硅酸盐泡沫中反裂纹扩展的实验数据。
英文摘要：
A particular failure mode of highly porous brittle materials consists in the propagation of cracks under uniaxial compressive loads. Such 'anticracks' have been observed in a range of materials, from snow and porous sandstone to brittle foams. Here we present a computational model for the formation and propagation of anticrack-type failure in porous materials within the general computational framework of bond-based peridynamics. Random porosity is represented, on a scale well above the characteristic pore size, by random bond deletion (dilution disorder). We apply our framework to experimental data on anticrack propagation in silicate foams.
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