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PhD Dissertation Position in Dynamic Failure of Advanced Materials at Northwestern University

Submitted by Horacio Espinosa on
job

Description

Applications are invited for a research assistant position within the Micro and Nano Mechanics Laboratory in the Department of Mechanical Engineering, Northwestern University.  The successful candidate will join a vibrant interdisciplinary research group and be involved in projects addressing multiscale experimentation and modeling of advanced materials.  We seek a motivated, talented and independent individual interested in conducting research on the characterization of material instabilities and failure.

A theory of constrained swelling of a pH-sensitive hydrogel

Submitted by Cai Shengqiang on
research
suo group research
hydrogel
gel

Many engineering devices and natural phenomena involve gels that swell under the constraint of hard materials. The constraint causes a field of stress in a gel, and often makes the swelling inhomogeneous even when the gel reaches a state of equilibrium. To analyze inhomogeneous swelling of a pH-sensitive gel, we implement a finite element method in the commercial software ABAQUS.  The program is attached here.  Contact Shenqiang Cai (shqcai [at] gmail.com) for a description of the program.

Dear Omid and Sepehr

Submitted by Arash Zamani on
research
xfem

I think a non-zero entry in the stiffness matrix doesn't necessarily imply dependence of ith DOF on the jth DOF. This is the case also for standard FEM (without any enrichments). For example for a quadrilateral 2D element the x component of displacement has interaction with y component at each node, but as we know, two independent values of translation in x and y directions can

Looking for a Post-Doc position in Geomechanics, in Europe

Submitted by Adrien Haxaire on
job
thermodynamics
FEM
geomechanics
post-doc
computational
postdoctoral

Dear all,

My name is Adrien Haxaire. I am currently Associate Professor at LGCIE, INSA Lyon, France, until end of August. I am looking for a
Post-Doc position in geomechanics in Europe.

During my PhD, I developped a thermodynamical model capable of describing coupled THMC phenomena in unsaturated porous media. It was implemented in Cast3M. 

I am very interested in chemical reactions in porous media, their modelling and implementation. I am also interested in the field of CO2 sequestration.

Parabolic distribution of shear stress

Submitted by Huma Khalid on
research

Hi all

According to Timoshenko beam theory shear stress is distributed uniformly across the cross-section depth which is contrary to real distribution of shear stress i.e parabolic distribution. I know there is a shear adjusment factor (5/6 for rectangular cross-section) can solve this problem. But I don't know how can I utilize this adjustment factor in the beam formulation to get parabolic distribution.

Could anybody please help me?

 

Regards

Huma

Does anyone know which software can plot implicit functions?

Submitted by Peichen1573 on
software
software，implicit function

I'm new to this web,but I know this is a wonderful  forum for reserchers where you can discuss scientific problems with others.(some professors are  experts in their fields). I'm now studying anisotropic yield criteria,so I need  a graph software which can plot implicit funtions (such as  ellipse in the form of x^2-x*y+y^2=1) as well as experimental data.

I know Graph can plot implicit funtions,but the quality of  its graph is not good enough.Anyone knows other softwares please give me some advice,thanks in advance.

Some questions about wave propagation

Submitted by LG on
research
shock waves
linear wave equation
ultrasound

Dear Sir，

As we know, periodic signals are best analysed in the frequency domain while stochastic signals are usually more profitably analysed in the time domain. The analysis in the frequency domain usually concern only one signal while in the time domain often involves the comparison of several different signals.

1) what are the general methods for transforming the frequency domain into time domain, and which should be superior?

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