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cavitation

Cai Shengqiang's picture

Drying-induced cavitation in a constrained hydrogel

Cavitation can be often observed in soft materials. Most previous studies were focused on cavitation in an elastomer, which is under different mechanical loadings. In this paper, we investigate cavitation in a constrained hydrogel induced by drying. With taking account of surface tension and chemo-mechanics of gels, we calculate the free energy of the system as a function of cavity size. The free energy landscape shows double-well structure, analogous to first-order phase transition.  Above the critical humidity, a cavity inside the gel is tiny.

Cavitation in Rubber: An Elastic Instability or a Fracture Phenomenon?

The viewpoint that cavitation in rubber — that is, the sudden growth of inherent defects in rubber into large enclosed cavities in response to external stimuli — is a purely elastic phenomenon has long been known to be fundamentally incomplete. Essentially, this is because the local stretches around the defects at which cavitation initiates far exceed the elastic limit of the rubber, which therefore ought to inelastically deform by fracturing to accommodate their growth.

Oscar Lopez-Pamies's picture

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how to compute cavitation effect by ABAQUS

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hi

i need to simulate the "bulk" and "local" cavitation region around a structure in fluid subjected to underwater explosion.

maybe i need to calculate the negative pressure regions. but how?!

how can i define the condition and compute that cavitation effects by ABAQUS?

 

i appreciate your help

 

tnx

 

LECAM's picture

Cyclic volume changes in rubber

This is a study dealing with the volume variation in filled crystallizable natural (F-NR) and uncrystallizable styrene butadiene (F-SBR) rubbers subjected to cyclic loadings. During their deformation, such materials exhibit volume variation induced by the cavitation phenomenon and the decohesion between particles and the rubber matrix.

LECAM's picture

Volume variation in filled and unfilled natural rubber : competition between cavitation and stress-induced crystallization

this is a study on the competition between cavitation and stress-induced crystallization during the deformation of cis-1,4 polyisoprene rubber. During deformation, this kind of material exhibits volume variation induced by both phenomena. In this study, we propose to measure this volume variation by an original full-field measurement technique. The high resolution of this technique allows us to identify characteristic stretch ratios during mechanical cycles.

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