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Prony series with temperature dependent stiffness

Submitted by augustus on
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Hello,

I have implemented a viscoelastic model (Simo/Hughes approach: Prony series for small strain)

in Abaqus using Umat and it works fine for dynamic isothermal simulations (I validated with the Prony series implemented in Abaqus).

Now, I want to consider thermal loads (I have temperature dependent stiffnesses from a DMA experiment).

How should I use these temperature dependent stiffnesses in the model?

A postdoctoral associate position at Department of Petroleum Engineering, Texas A&M University

Submitted by srabeedii on

A postdoctoral associate position is available at Department of Petroleum Engineering, Texas A&M University in the area of resistivity characterization of geomaterials. Experimental characterization at nano-scale will be combined with modeling techniques to get insight into electrical properties of geomaterials at fundamental length scales. 

Expected qualifications:
A Ph.D. in materials science, engineering or a related field is required. The candidate should have a strong background

On structured surfaces with defects: geometry, strain incompatibility, internal stress, and natural shapes

Submitted by Ayan Roychowdhury on

Given a distribution of defects on a structured surface, such as those represented by 2-dimensional crystalline materials, liquid crystalline surfaces, and thin sandwiched shells, what is the resulting stress field and the deformed shape? Motivated by this concern, we first classify, and quantify, the translational, rotational, and metrical defects allowable over a broad class of structured surfaces. With an appropriate notion of strain, the defect densities are then shown to appear as sources of strain incompatibility.

Reserch Fellow Position in the National University of Singapore

Submitted by L.H.Poh on

 We are looking for a Research Fellow to work on the penetration resistance of concrete subjected to high velocity projectile impact (see description in attached file). To apply, please send a single pdf file including cover letter, cv, list of publications and the contact details of 2 references, to ceeplh [at] nus.edu.sg

Research scientist in computational mechanics of composite materials at Institute of High Performance Computing, A*STAR, Singapore

Submitted by Su Zhoucheng on

We are looking for capable and responsible candidates for a Research Scientist position in Computational Mechanics of Composite Materials:

  • PhD in Mechanical Engineering / Materials Science

  • Strong background in Mechanics of Composite Materials (CFRP, GFRP, Nanocomposites, and/or CMCs)
  • Specialization in Computational Mechanics, Materials Modeling, and/or Multi-scale Methods

  • Expertise in Linear and Nonlinear Finite Element Analysis 

  • Good coding skills for  Scientific Computing  

PhD/masters position in Mechanical Department at University of Hawaii at Manoa

Submitted by bardia on

A PhD/masters position is available in AMMI Lab at University of Hawaii at Manoa in the field of surgical robotics. Interested and outstanding candidates should visit my website at http://uhatmanoa.wixsite.com/ammi. Information about general admission process could be found on http://uhatmanoa.wixsite.com/ammi/prospective-students.

Post-Doc Position Available in Computational Mechanics

Submitted by rami98 on

A post-doctoral position is available in the Mechanics of Composite Materials (MCM) Lab at the Faculty of Engineering, Tel-Aviv University (TAU), Israel.  The candidate will engage in multiple related projects in the areas of nonlinear micromechanics and multi-scale modeling. 

 

Please make sure to read the attached PDF file for detailed requirements and description.

On a systematic approach for cracked rotating shaft study: breathing mechanism, dynamics and instability

Submitted by saberelarem on

We present a systematic approach to deal with the modelling and analysis of the cracked rotating shafts behaviour. We begin by revisiting

the problem of modelling the breathing mechanism of the crack. Here we consider an original approach based on the form we give to the energy of the system and then identify

the mechanism parameters using 3D computations with unilateral contact conditions on the crack lips. A dimensionless flexibility is identified which makes the application