This paper studies the poroelastic behavior of an alginate hydrogel by a combination of theory and experiment. The gel—covalently crosslinked, submerged in water and fully swollen—is suddenly compressed between two parallel plates. The gap between the plates is held constant subsequently, and the force on the plate relaxes while water in the gel migrates. This experiment is analyzed by using the theory of linear poroelasticity. A comparison of the relaxation curve recorded in the experiment and that derived from the theory determines the elastic constants and the permeability of the gel. The material constants so determined agree well with those determined by using a recently developed indentation method.

Hello,

I'd like to ask if anybody knows if it is possible to use an ABAQUS usersubroutine that could vary some parameters (τmax, kn or ks etc) of the cohesive zone model of ABAQUS with the vertical pressure applied on the interface. The new ability of ABAQUS to support cohesive behaviour in contact surfaces seems very interesting and useful, however how could somebody simulate the interface under a compression - shear regime that may follow a Mohr-Coulomb type behaviour?

I tried to use the subroutine USDFLD. However I realised that it cannot be used with contact parameters as internal variables. Does anybody have any particular idea on this?

Dear Colleague:

Oral abstract submission is now closed for the Workshop on Probing the Limits of Strength; however, the deadlines for poster abstract submission (200 words or less to berkeleyworkshop09@gmail.com) and advance registration have been extended to the end of July. See the Workshop's website for further details: http://www.mse.berkeley.edu/groups/aminor/09_Workshop/Workshop_Announcement.html. The Workshop's program and the registration form can be downloaded from that website.

Hi. I am currently using cohesive element traction-separation law for modeling interface element between FRP and concrete. Can any one tell me how to define the contact state if the corresponding cohesive element is under compression in ABAQUS?   Yes, it's said that there won't be any damage if pure compression is applied to cohesive element, but my questions is how to consist of assuming that friction occurs on the damaged part as there is no friction definition in cohesive traction-separation law.   Please add comments if you know something about this. Thanks for help ^_^

Hi all ,

We were doing compression testing of alumina using Instron compression testor. plates used to compress the specimen is made up of Steel. When we applying load in elastic region we are not able to see right deflection because of compliance. Deflection of alumina is not clear as we are getting lots of compliance error. Has anyone faced similar problems. Is changing the steel plate and using any hard material in place of steel is the solution.

 Thanks

Hello everyone,

Here is the problem I have: I'm modeling the geometry of a simple straight edge crack in a 2D elastic medium using Abaqus. I assume plain stress conditions. The crack makes an angle with the horizontal, is small enough to be considered as embedded in an infinite domain (ratio crack length/size of domain < 1/10) and I apply a vertical compressive load on top of my domain. I fixed one point in displacement at the bottom of it and the whole bottom edge is constrained not to move vertically.

We present atomistic simulations of the tensile and compressive loading of single crystal FCC nanowires with <100> and <110> orientations to study the propensity of the nanowires to deform via twinning or slip.  By studying the deformation characteristics of three FCC materials with disparate stacking fault energies (gold, copper and nickel), we find that the deformation mechanisms in