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Is wear law really Archard's law (1953), or Reye's law (1860) ???

Submitted by Mike Ciavarella on
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tribology

In 1860 the mathematician and geometer Reye proposed a simple and elegant theory for explaining the consumption of a solid body when it slides with friction on a rough surface [8]. Reye’s model became very popular in Europe (in Italy was promulgated by Panetti [7]), and it is still taught in university courses of applied mechanics. But, strangely enough, this theory has been totally ignored in English and American literature.  Why? A paper from 2001 by Villaggio is interesting to read today.


15 PhD grants for foreign (non-Italian) students at the University of Padova (Italy)

Submitted by michele.zappal… on
research
15 PhD grants for foreign (non-Italian) students at the University of Padova (Italy)

The University of Padova opened a selection for 15 PhD grants for
foreign (non-Italians) students with deadline for application at
September 19th. The call and information for the selection are available
at the following website:

http://www.unipd.it/en/research/doctoral-degrees-phd-programmes.


Michele Zappalorto PhD

Assistant Professor of Machine Desing

University of Padova, Italy

Transient Heat Conduction in Abaqus with moving heat source

Submitted by engtribe on
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I have a reinforced concrete structure and was wanting to run some transient heat conduction simulations on it using Abaqus. Ideally I would like to be able to specify a heat source of some magnitude and have that move around the structure over a given length of time in order to study how the structure heats up, deforms, and then cools back down.

I also need to know how to specify thermal conductivity in abaqus if I am using a tapered beam elemet with a generalized cross-section. Under the basic tab it only seems to allow me to specify the thermal expansion coefficient.

Predictive abilities for stresses in individual inclusions and the matrix by the Mori-Tanaka and PGMT formulation

Submitted by Atul Jain on
research

Both effective properties of composite and the stresses in the individual inclusions and in the matrix are necessary for modelling damage in short fibre composites. Mean field theorems are usually used to calculate the effective properties of composite materials, most common among them is the Mori–Tanaka formulation. Owing to occasional mathematical and physical admissibility problems with the Mori–Tanaka formulation, a pseudo-grain discretized Mori–Tanaka formulation (PGMT) was proposed in literature.

Search for a suggestion for Abaqus question

Submitted by eddie32 on
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Computational Mechanics Forum
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ABAQUS
User defined subroutine

Dear all,

       I want to achieve these procedures in abaqus, but I did not know how to do it, could you give me some suggestions?

      In the first step, discretize the structure by the transport mesh and run transport analysis for the structure.

     In the second step, using the results (stored in the user defined field), discretize the structure by the stress mesh(normal stress analysis), and run the stress analysis.

What is incompressible solid?

Submitted by Breslavsky on
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poisson's ratio
incompressible elasticity
strain invariant

Dear Colleagues,

 

In the literature two definitions of incompressible solid can be found. The first one is: Poisson's ratio =0.5, and the second is: the  third invariant of the Cauchy-Green deformation tensor J=1. I wish to understand the connections between these two definitions. To me, here is something strange.  Poisson's ratio relates strains to stresses,and J as the combination of strain tensor components, doesn't depend on Poisson's ratio. I'll be grateful to you, if you explain me how these two definitions are connected.

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