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WaiChing Sun's picture

Journal Club Theme of September 2014: Numerical modeling of thermo-hydro-mechanical coupling processes in porous media

Thermo-hydro-mechanics (THM) is a branch of mechanics aimed to predict how deformable porous media behave, while heat transfer and fluid transport simultaneously occur in the pores filled by liquid and/or gas. Understanding these multi-physical responses is important for a wide spectrum of modern engineering applications, such as tissue scaffolding, geothermal heating, mineral exploration and mining, hydraulic fracture, energy piles, tunneling with frozen soil and nuclear waste storage and management.

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Wenbin Yu's picture

Micromechanics Simulation Challenge

As the importance of micromechanics is increasingly realized in composites design & manufacturing at the industry level, cdmHUB is launching a Micromechanics Simulation Challenge for the purpose of establishing the best practices for homogenization and dehomogenization needed in composites design and manufacturing.

Markus J. Buehler's picture

MIT Faculty Positions in Civil & Environmental Engineering

The Department of Civil and Environmental Engineering invites applications for several tenure-track faculty positions to begin July 2015 or thereafter.  Appointments will be at the assistant or untenured associate professor level. In special cases, a senior faculty appointment may be possible.  We will consider exceptional candidates in a range of areas, broadly defined.  Further information about the department can be found at this page

Sulin Zhang's picture

PhD positions (TA/RA) available at Penn State

We are looking for PhD candidates to conduct research at the following two interdisciplinary subfields, starting from Spring of 2015. Interested individuals are encouraged to apply (suz10@psu.edu)

1) Mechanics in electrochemistry. We develop atomistically informed continuum mechanics models, coupling mechanics and lithium reaction and diffusion to account for a wide range of in-situ experimental phenoemna. Some recent publications:

Book on elastic wave propagation

Our book Introduction to Elastic Wave Propagation, originally published by Wiley in 1994, is now in the public domain. The book is attached. We intended it to be suitable for a one-semester course or for self-study by students needing background on elastic waves. (The solutions to the exercises are included.) Chapter 1 can also be used as a concise introduction to linear elasticity.

Anthony Bedford (abedford@mail.utexas.edu)

Douglas S. Drumheller (dsdrumh@q.com)

baijatnal's picture

Sharing the elastic lamina or engineering constant properties of GFRP

hi Can anybody give me the elastic lamina or engineering constant properties of GFRP composites with roving E-glass formed  by Araldyte LY 556 and Hardener HY 951.

 

Thanks and Regards

 

baij

material grade details

i want to know the material grade which is used in APPLE phones/laptop circuit chassis 

i know that aluminium is used .grade please????

 

Cihan Tekoğlu's picture

Representative Volume Element Calculations under Constant Stress Triaxiality, Lode Parameter, and Shear Ratio

Recent experiments showed that the Lode parameter, which distinguishes between axisymmetric and shear dominated stress states, has a profound effect on material ductility, especially at low stress triaxiality. Consequently, the theoretical framework for void growth and coalescence is currently being revisited, which often involve performing representative volume element (RVE) calculations. The present study investigates an RVE composed of a cubic unit cell containing a spherical void at its center.

Leon Mishnaevsky's picture

Fatigue of multiscale composites with secondary nanoplatelet reinforcement: 3D computational analysis

3D numerical simulations of fatigue damage of multiscale fiber reinforced polymer composites with secondary nanoclay´reinforcement are carried out. Macro–micro FE models of the multiscale composites are generated automatically using Python based software. The effect of the nanoclay reinforcement (localized in the fiber/matrix interface (fiber sizing) and distributed throughout the matrix) on the crack path, damage mechanisms and fatigue behavior is investigated in numerical experiments.

Tenure-Track Faculty Position in Computational Mechanics - The George Wasgington University

The Department of Civil and Environmental Engineering at the George Washington University invites applications for a tenure-track faculty position at the level of Assistant Professor starting fall semester 2015. The primary field of interest is mechanics of geomechanical and structural systems. Applications from women and under-represented minority groups are strongly encouraged. 

Basic Qualifications

Zhigang Suo's picture

Viscosity

The attached notes are written for a course on plasticity.  I will update new posts on my twitter account:  https://twitter.com/zhigangsuo.  

Micromechanical Study of the Interface Properties in Concrete Repair Systems

Hi all,

We've recently published a paper on

Micromechanical Study of the Interface Properties in Concrete Repair Systems

It deals with nanoindentation and numerical simulation of the interface zone in concrete repair systems.

Greetings

Zhigang Suo's picture

Strain hardening

The attached notes are written for a course on plasticity.  I will update new posts on my twitter account:  https://twitter.com/zhigangsuo.  Rheology is the science of deformation. This science poses a question for every material: given a history of stress, how do we find the history of strain?

Post Doctoral Position

Open Post Doctoral Position in Biomechanics for 2 years, fully employed, at the Institute of Biomechanics in Graz, Austria.

For more details please see the attachment.

Leon Mishnaevsky's picture

Hybrid and hierarchical nanoreinforced polymer composites

Hybrid and hierarchical polymer composites represent a promising group of materials for engineering applications. In this paper, computational studies of the strength and damage resistance of hybrid and hierarchical composites are reviewed. The reserves of the composite improvement are explored by using computational micromechanical models. It is shown that while glass/carbon fibers hybrid composites

Leon Mishnaevsky's picture

Graphene reinforced polymer composites: 3D micromechanical modelling, damage and fracture

3D computational model of graphene reinforced polymer composites is developed and applied to the analysis of damage and fracture mechanisms in the composites. The graphene/polymer interface properties are determined using the inverse modeling approach. The effect of composite structure, in particular, of the aspect ratio, shape, clustering, orientation and volume fraction of graphene platelets on the
mechanical behavior and damage mechanisms of nanocomposites are studied in computational experiments.

Sutured tendon repair; a multi-scale finite element model.

We've recently published an open access journal paper that looks at the mechanics of sutures used to repair severed tendons. A homogenization strategy is used to derive effective elastic properties for tendon fibrils and intracellular matrix. We have found that regions of high stress correlate with the regions of cell death (necrosis) that are sometimes observed in patients.

If this is of interest, please feel free to view the paper here.

 

 

How can I get in Abaqus (XFEM) the Griffith' energy release rate G per time increment?

I want to visualize my results of the XFEM crack growth in form of a diagram with the time increments or the crack length on the horizontal axis and the Griffith' energy release rate G or the stress intensity factor K on the vertical axis. I am using the energy-based damage model.

I don't know, where to activate those values in the Output History. The best solution for me is, if the energy release rate G can be transformed into the stress intensity factor.

Can somebody assist me with modelling the crack propagation with XFEM (Abaqus) in connection with contact problems?

Hello,

I want to arrange a crack propagation in a screw thread. Therefor I use two dimensional axissymmetric elements in Abaqus 6.12-3 (it is the first version, that allows XFEM in axissymmetric models). The boundaries of the screw thread are on the one hand the symmetry axis, on the other hand the contact to a nut thread that is hold in vertical direction. Thus, there are two nonlinear problems: 1.) the contact problem and 2.) the XFEM crack growth.

1.) Arranging the analysis of the contact problem without crack growth works thoroughly.

Faculty Position - UCSB Mechanical Engineering - Assistant Professor - Tenure Track

FACULTY POSITION

MECHANICAL ENGINEERING

COLLEGE OF ENGINEERING

UNIVERSITY OF CALIFORNIA, SANTA BARBARA

JOB NUMBER JPF00380

 

The Department of Mechanical Engineering at the University of California, Santa Barbara invites applications for a tenure track faculty position at the level of Assistant Professor with a start date of July 1, 2015 or later. 

ABAQUS subroutine for compressible neo-Hookean material

Hi everyone, 

 

I am new to ABAQUS software and recently i was trying to implement compressible neo-Hookean material in ABAQUS and for me it is a very difficult task. There are already codes available for the nearly incompressible neo-Hookean material. Since ABAQUS is a widely used software,  i was wondering whether there are any database avaible consisting different codes that we can access. I am desperately looking for a subroutine for compressible neo-Hookean material. Can someone please help me or give me some direction. Thanks a lot !

 

Best,Deegayu

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