Cracks in tensile-contracting and tensile-dilating poroelastic materials.
Int J Solids Struct
; 286-2872024 Jan 01.
Article
en En
| MEDLINE
| ID: mdl-38130319
ABSTRACT
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.
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1
Colección:
01-internacional
Base de datos:
MEDLINE
Idioma:
En
Revista:
Int J Solids Struct
Año:
2024
Tipo del documento:
Article
País de afiliación:
Estados Unidos