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thermal stress in ANSYS

Hallo,

I'm using ANSYS for study the internal stresses of a trilayer structure resulting after a cooling process. The middle layer (the solder) has temperature dependent material properties and the other two layers can be considered temperature indipendent mat. properties. If I use a static analysis the software uses the material properties reffered to final temperature.

For an linear elastic analysis is this a realistic procedure?

If the solder deforms plastically at high temperature and not at final temperature..how can I do?

Ting Zhu's picture

Surface dislocation nucleation

 

  Surface dislocation nucleation

Ting Zhu, Ju Li, Amit Samanta, Austin Leach and Ken Gall, “Temperature and strain-rate dependence of surface dislocation nucleation”, Physical Review Letters, 100, 025502 (2008).

Leon Mishnaevsky's picture

International Workshop on Mechanics of Wood & its Applications in Wind Energy Technogies, Dhulikhel, Nepal, 10-12 November 2008

The International Workshop on Mechanics of Wood and its Applications in Wind Energy Technologies will take place 10-12 November 2008 in Dhulikhel, Nepal.

The Call for Papers is here. Abstracts are due by April 30, 2008.

wear of articulating surface of joint replacement

Hi everyone out there...

Now i'm working on biomechanics research project which deals with the articulating surface of joint replacement, where one of the main problem were the wear of sliding contact (i.e., metal on polymer,metal on metal or polymer on ceramics).wear debris or particles generated from this articulating surface can causes the damage of the bone cell around the joint replacement.My question are;

Crack Kinking Out of an Interface - realization in a software

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Dear Collegues,

Abhijit Mahato: a beloved friend and colleague

I'd like to bring this sad news to the attention of iMechanica:

http://timesofindia.indiatimes.com/articleshow/msid-2716073,prtpage-1.cms

Edit: Amit, I hope you don't mind that I changed the title of this post.-John Dolbow

  

The factory idiom and material models

I'm leaving the US in a couple of days and will probably take a hiatus of a few months from iMechanica.  Before I leave, I want to tell you about a C++ idiom that eases the implementation and use of multiple material models in a computational mechanics code.

Entropic-elasticity-controlled dissociation and energetic-elasticity-controlled rupture induce catch to slip bonds in cell-adhes

In order to achieve a wide variety of biological phenomena, the abilities of cells to contact effectively and interact specifically with neighboring media play a central role. It is known that cells can sense the chemical and mechanical properties of surrounding systems and regulate their adhesion and movement through binding protein molecules within cell membrane. The kinetics of binding molecules interacting with ligands is of great interest in biophysical society. There are lots of discussions and contributions on cell mechanics from our mechanical society, e.g.

Modelling of bi-layer system of slabs using ABAQUS.

 Hi everyone,

I am working on a project which deals with the bi-
layer system of slabs(i.e., two layers of different concretes bonded
together with a cement grout). The only loading case is the
temperature, i.e, due to the high room temperature different
concretes will conduct different temperatures and due to which the
stresses are developed and hence due to warping the edge curling and
delaminations occur.

My questions are;

1. what are the bond properties required to input in the abaqus?.

Ashkan Vaziri's picture

Cell and Biomolecular Mechanics in silico, Nature Materials, Volume 7, 2008.

Recent developments in computational cell and biomolecular mechanics have provided valuable insights into the mechanical properties of cells, subcellular components and biomolecules, while simultaneously complementing new experimental techniques used for deciphering the structure–function paradigm in living cells. These computational approaches have direct implications in understanding the state of human health and the progress of disease and can therefore aid immensely in the diagnosis and treatment of diseases.

Nanshu Lu's picture

Singapore International Graduate Award (SINGA)

The Singapore International Graduate Award (SINGA) is a collaboration between the Agency for Science, Technology & REsearch (A*STAR), the National Unviersity of Singaproe (NUS) and the Nanyang Technological University (NTU). PhD training will be carried out in English at your chosen lab at A*STAR Research Institutes, NUS or NTU. Students will be supervised by distinguished and world-renowned researchers in these labs. Upon successful completion, students will be conferred a PhD degree by either NUS or NTU.

Applications

Postdoctoral Research Position at IDMEC-FEUP, Portugal

The Institute of Mechanical Engineering of the Faculty of Engineering of the University of Porto, Portugal, intents to contract 2 researchers (postdoctoral) to work in the group of Structural Integrity. The main topics of this group are:

- Development of advanced composites

- Product development

- Fracture and fatigue behaviour of components

Graduate student position at Royal Institute of Technology (KTH)

See http://www.hallf.kth.se/NYAJOBB/nyajobb_en.html

The position is at the Department of Solid Mechanics, KTH . The theme of the graduate student project is "Crack growth in rubber and rubber like materials".

Metal Foam failure

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Dear All

I'm working on studing the use of metal foam in sandwich structre containing Al or steel plate to overcome an impact shells or plates at differnet impact velocity but the prblem that I face how to define the failure critrion of Meat foam except difine the crushable foam properties, and I've read a paper on using cohesive element but i don'nt know how to use it.

Hopefully some one can help me solving this prblem, by the way I'm using ABAQUS v6.6

Regards

Teng Li's picture

iMechanica: 5000 registered users, 9.5 million web hits


Launched on 9 September 2006, iMechanica is the web of mechanics and mechanicians.  The mission of iMechanica is twofold:

N. Sukumar's picture

Geometric Design, Computer Graphics, and FEM

I recently participated in a minisymposium (SIAM Conference ), where geometric modeling, graphics, and finite elements were the focus. Over the past 4 to 5 years, there has been a lot of interest in the construction of barycentric coordinates on polygons/polyhedra, and the minisymposium brought together many of us with common interests.

Xi Chen's picture

Two faculty positions in computational and experimental mechanics at Columbia University

Columbia University
Department of Civil Engineering and Engineering Mechanics


The Department of Civil Engineering and Engineering Mechanics invites applications for TWO tenure-track faculty positions to support a Department initiative in Sustainable Engineering. Qualified individuals are sought with expertise in either:

(1) Computational mechanics - with an emphasis on large-scale computing applied to multi-scale, multi-phase modeling of materials (from nano- to macro-scale), and/or mechanics and materials challenges in energy and/or the environment.

A message from Ken Chong (NSF): CDI panelists recruiting

The NSF is preparing to handle the review of preliminary proposals submitted in response to the Cyber-enabled Discovery and Innovation (CDI) solicitation.

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