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Microcanonical Entropy and Mesoscale Dislocation Mechanics and Plasticity

Submitted by Amit Acharya on
research
Plasticity
thermodynamics
statistical mechanics
dislocations
continuum mechanics

(Journal of Elasticity, Carlson memorial Volume)

A methodology is devised to utilize the statistical mechanical entropy of an isolated, constrained atomistic system to define the dissipative driving-force and energetic fields in continuum thermomechanics. A thermodynamic model of dislocation mechanics is discussed. One outcome is a definition for the mesoscale back-stress tensor and the symmetric, polar dislocation density-dependent, Cauchy stress tensor from atomistic ingredients.

IOSO Multilevel Robust Design Optimization Methodology

Submitted by IOSOnier on
research
IOSO
Robust Design Optimization

Dear Colleagues,

We would like to share our thoughts about our approach to Robust Design Optimization and our way how we sufficiently increase the speed of solution of RDO problems in full stochastic statement with the involvement of probability objectives and adaptive surrogate model construction tools.

We will present this theory during our joint Webinar with Ansys: The link to on-line Webinar registration…

Please see the details in the attached PDF

Fatigue Crack Growth Under Spectrum(Random) loading

Submitted by uni_students2009 on
research
residual stress
crack closure
Glinka's Model

Dear all Researchers, 

 I am writing regarding for the first time about the UAA(Unified analytical aspect) on Fatigue crack growth. The idea of this technique is this question : too many fatigue life prediction relations but still those are not perfect. on the other hand, new math ways still have not been the classical fracture mechanics. I am looking for some comments as response to this concern. Clearly, how we upgrade fracture mechanics theory using atomistic development in modeling fatigue propagation?

 Let us talk about this.

Regards,

Abaqus, UMAT, Constitutive law, Powder

Submitted by leo20002000 on
research
ABAQUS
UMAT
Constitutive law
Powder

Dear all,

 

I have several questions about how to use existing constitutive law of material to code UMAT in Abaqus. I have carried out experiment for several powder materials, including metal, ceramic, polymer powders. The powder aggregate is compacted in a cylindrical die. After the compaction, relationships between axial stress and axial strain, radial stress and axial strain are obtained. The material under such condition is always treated as elastic plastic material.

Elastoplastic deformation of Grey cast iron

Submitted by YangTan on
research
Elastoplastic deformation
Grey cast iron

Hello.all!

Is anyone doing the work on the modeling of  constitutive equation of Grey cast iron in large deformation?

Recently i read  Holm Altonbach's paper "on the Elastoplastic deformation of Grey cast iron" ,  i wonder how to convert the relation (stress-strain) into (stress-hardening parameter). I'm also not sure if the constitutive model can be used in large defomation simulation. 

 thanks in advance!

Y.T.

Postdoc position at UConn: Mechanical behavior of cellular filaments

Submitted by gelyko on
research
molecular dynamics
postdoctoral position
LAMMPS
force fields
cellular membranes

A postdoctoral position is available at the Mechanical Engineering Department of the University of Connecticut in the area of coarse-grain molecular dynamics simulation of cellular membranes and filaments. Extensive experience in molecular dynamics simulation of soft materials and parallel coding is required. Experience in the use of force fields and LAMMPS is highly desirable.

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