Cracks in tensile-contracting and tensile-dilating poroelastic materials.
Cracks in tensile-contracting and tensile-dilating poroelastic materials.
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DOI：
10.1016/j.ijsolstr.2023.112563
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发表时间：
2023-11
影响因子：
3.6
通讯作者：
Konstantinos Garyfallogiannis;Prashant K. Purohit;John L. Bassani
中科院分区：
文献类型：
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作者：
Konstantinos Garyfallogiannis;Prashant K. Purohit;John L. Bassani
纤维凝胶，如软骨，血凝块，和碳纳米管为基础的海绵与吸收油遭受体积减少的液体在单轴拉伸下的驱逐，这直接影响裂纹尖端领域和能量释放率。通过改变两个材料参数的比值，建立了各向同性纤维凝胶的连续介质模型，该模型在单轴拉伸下表现出从体积增大到体积减小的一系列行为。使用孔隙弹性来模拟这种凝胶的孔隙中的液体的运动。裂纹周围的液体通量的方向取决于凝胶局部体积的增加或减少。裂纹的能量释放率计算使用一个表面独立的积分，它被证明有两个贡献-一个从固体网络中的应力，另一个从液体的流动。当凝胶体积减小时，液体渗透对积分的贡献趋于负值，这是一种有效的裂纹屏蔽机制。
Fibrous gels such as cartilage, blood clots, and carbon-nanotube-based sponges with absorbed oils suffer a reduction in volume by the expulsion of liquid under uniaxial tension, and this directly affects crack-tip fields and energy release rates. A continuum model is formulated for isotropic fibrous gels that exhibit a range of behaviors from volume increasing to volume decreasing in uniaxial tension by changing the ratio of two material parameters. The motion of liquid in the pores of such gels is modeled using poroelasticity. The direction of liquid fluxes around cracks is shown to depend on whether the gel locally increases or decreases in volume. The energy release rate for cracks is computed using a surface-independent integral and it is shown to have two contributions — one from the stresses in the solid network, and another from the flow of liquid. The contribution to the integral from liquid permeation tends to be negative when the gel exhibits volume decrease, which effectively is a crack shielding mechanism.