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Drying-induced cavitation in a constrained hydrogel

Submitted by Cai Shengqiang on
research
hydrogel
cavitation
instability

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.

Ripplocations = surface ripples + dislocations ?

Submitted by Sulin Zhang on
research

Dislocations are topological line defects in three-dimensional crystals. Same-sign dislocations repel according to Frank’ s rule . This rule is broken for dislocations in van der Waals (vdW) layers, which possess crystallographic Burgers vector as ordinary dislocations but feature “ surface ripples”  due to the ease of bending and weak vdW adhesion of the atomic layers. We term these line defects “ ripplocations”  in accordance to their dual “ surface ripple”  and “ crystallographic dislocation” characters.

Abaqus data extracting

Submitted by S Patel on
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hello sir/madam

 

i am performing the analysis on biamaterial crack problem on CT specimen for detrmining the plastic zone and i found mises data as i assigning the two sections for these analysis. Now i have found nonsequence order of the mises value due to clashing of mises value at common nodes. so, any one suggest me how to get mises values at each node either in proper order or with geomatrical coordinates. 

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

Submitted by Victor Lefèvre on
research
cavitation

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.

MUSAM - Multi-scale Analysis of Materials - Annual report 2014

Submitted by marco.paggi on
research
Annual report
fracture mechanics
contact mechanics
Interface problems

Dear Colleague,

 

I would like to inform you that the annual report on the scientific and educational activities carried out by the research unit MUSAM on Multi-scale Analysis of Materials at IMT Lucca during 2014 can be downloaded from the following link:

 

http://musam.imtlucca.it/Report_2014.pdf

 

Yours sincerely,

Marco Paggi 

Recoverable plasticity in penta-twinned metallic nanowires governed by dislocation nucleation and retraction

Submitted by yinsheng008 on
research
Twin boundary
nanowire
in situ TEM
MD Simulation

Abstract: There has been relatively little study on time-dependent mechanical properties of nanowires, in spite of their importance for the design, fabrication and operation of nanoscale devices.

Case Study: Modelling Ultrasonic Array Response of Real Cracks

Submitted by Simpleware on
research
simpleware
NDT
ultrasonic
cracks
FEA

Stress corrosion cracks can be a serious problem in many engineering industries, and especially so for critical parts. While an ultrasonic transducer can be used for the non-destructive evaluation of cracks with simple shapes, complex branching cracks, such as stress corrosion cracks, require ultrasonic arrays that consist of multiple transducers and are able to inspect at multiple angles.

Quantitative modeling of the equilibration of two-phase solid-liquid Fe by atomistic simulations on diffusive time scales

Submitted by mohsenzaeem on
research
Molecular Dynamics (MD); Phase Field Crystal

Molecular dynamics (MD) simulations based on the modified-embedded atom method (MEAM) and a phase-field crystal (PFC) model are utilized to quantitatively investigate the solid-liquid properties of Fe. A set of second nearest-neighbor MEAM parameters for high-temperature applications are developed for Fe, and the solid-liquid coexisting approach is utilized in MD simulations to accurately calculate the melting point, expansion in melting, latent heat, and solid-liquid interface free energy, and surface anisotropy.

Add XFEM crack to an already deformed model

Submitted by thestock on
research

I hope this can be done and I want to say thank you in advance for any feedback.

I have already completed a simulation of a plate with a hole and pulling a mandrel through the hole to expand it and create a plastically deformed hole.

Now, I would like to take this plastically deformed hole, add an XFEM crack and vertically pull to simulate a tension test.

Can this be done? 

Issues:
Tried Predefined Field - Stress: 

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