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Some problems in the paper---- Haversian cortical bone model with many radial microcraks: An elastic analytic solution.

Submitted by WANGXU on
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Dear everyone,

Recently I have read the paper--Haversian cortical bone model with many radial microcraks: An elastic analytic solution. In this paper, I can't understand the dislocations Burgers vectors (bt and bn), the following words and the corresponding expressions(6a) and (6b). The paper is attached.   

Now, if it is assumed that bt and bn are continually distributed

over the microcracks, the shear and normal stresses could be

formulated as (6a) and (6b).

 Waiting for your help. Thanks.

analysis of composite barrel with load sharing steel liner

Submitted by ajitbabar on
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i am doing structural analysis of composite barrel with load sharing steel liner from inside and IM7/PEEK composite sheathing outside. Can anyone guide me how to model composite sheathing material. i am using axisymmeteic model for analysis. loading is pressure from inner surface and temperature gradient across the thickness of cylinder.

 

                       thanks.

FSI Analysis of the Human Coughing Mechanism

Submitted by ADINA Support on
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biomechanics
large deformation
ale
Fluid Structure Interaction
Holzapfel

We present an application of ADINA FSI in the study of the human coughing mechanism. The aim of the study is to help surgeons to position tracheal implants effectively. Please see

http://www.adina.com/newsgH69.shtml

You can find many other examples of applications of ADINA in the analysis of multiphysics problems here:

http://www.adina.com/multiphysics.shtml

Failure Theory Applications

Submitted by Richard M. Chr… on
research

A new section on applications has been added to the website on failure criteria.  Six examples of failure applications are given which span the range from very ductile to very brittle isotropic and homogeneous materials.  Summarizing two of the examples, first a very ductile polymer is examined wherein its tensile, compressive, and shear strengths are determined as influenced by a state of superimposed hydrostatic pressure. An interesting fallout from the example shows just how seriously in error the Mises criterion can be, even when applied to a ductile material.

XFEM modelling in ABAQUS

Submitted by Anonymous (not verified) on
research

Hi

I am modelling the crack propagation in metals. I can do all the modelling but only adding the enrichment function in ABAQUS is an issue. I have defined the initial crack(for the CT speciemn), which starts at the node, but when I submitt the job it does not separate at that node. I think it because I did not define the enrichment functions.

I would  like to know how to add enrichment function in abaqus when modelling the crack propagation. Any suggestion would be appreciated.

 

Thanks in advance

Oscar

New paper on a Gurson like fracture model for plastically anisotropic materials

Submitted by Anonymous (not verified) on
research
ductile fracture
homogenization
Gurson model
void growth
anisotropic plasticity

Hello All. This is my first blog entry in iMechanica!. This post is about my new paper with Prof. Amine Benzerga entitled "A constitutive model for plastically anisotropic solids with non-spherical voids", accepted for publication in JMPS (URL: http://dx.doi.org/10.1016/j.jmps.2010.03.007 ). In case you are not able to view the online version, a preprint of the paper is attached. This paper should be of interest to anyone working in the ductile fracture area. Your comments and feedback are welcome.

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