I am currently working on constictutive modelling of soft biological tissues, considering them as nonlinear viscoelastic materials. I am using the split form of energy density function i.e modelling separately the hyperelastc part and the visoelastic part. I am using Ogden formula for hyperelastic part and for the viscoelastic part, I am currently using the second and third invariants of stretch rate tensor.
dear all
is there any formaula or any theory by i can make a relation for the tangent and secent modules in the plastic region of the stress strain curve?....and also how to find Et and Es for the Alloy steel?.. if any body knows any thing than let me know soon..
warm regards
Asit Rathod
asit_rathod1 [at] yahoo.com (asit_rathod1[at]yahoo[dot]com)
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This is a very fundmantal question.
What is the physical significance of stress invariants?
I understand that the stress invariant J2 of the deviatoric stress tensor is used to ecpress the yield criteria-but this is same as Von Mises yield criteria-I want to know what is so special about-stess invariants?
I understand that these invariants remain unaltered by rotation/transformation of the axis-is this the only reason for being so special or there i any other reason as well?
Dear All,
I am looking for a freeware molecular dynamics software working for Windows operative systems.
I have tried LAMMPS, but it seems to me that it works only under UNIX.
Thank you very much in advance for any information.
Best wishes, Marco Paggi
Dr. Ing. Marco Paggi, Ph.D.
Assistant Professor of Structural Mechanics
Alexander von Humboldt Research Fellow 2010-2011
Member of the Executive Board of the Italian Group of Fracture 2009-2011
A post-doc position is available now for one who has recently obtained (or about to get) his/her PhD on computational
geomechanics or computational mechanics. The successful candidate is expected to have strong background of mechanics
and extensive experience on computer programming (e.g., coding in FEM and/or DEM), and is able to work independently.
He/she who has previously worked on multi-scale modeling of material behavior will be particularly welcome to apply. The
initial contract is one year and is extendable to multiple years subject to his/her performance and availability of funding.
The geometric factor for mode I stress intensity factor for a finite strip under pure tensile loading is reported in Tada handbook as F(a/h) = 1.122 - 0.231(a/h) + 10.55*(a/h)^2 - 21.71*(a/h)^3 + 30.382*(a/h)^4 , but in the existing literature, I could not find such geometric factor for mode II stress intensity factor for a finite strip under under pure shear loading. Does anyone know such geometric factor for mode II stress intensity factor for a finite strip under under pure shear loading, if it is reported in the existing literature? or, if it is available in any unpublished sources?
