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penetration

Soil Mechanics and Fossil Dinosaur Trackways

Thu, 2010-12-16 21:16 - Lee Margetts
research
penetration
Plasticity
soft substrates
soils
Pile & Foundation
von mises
Geotechnics
Geotechnical engineering
foot deformity
Track

My PhD student Peter Falkingham (who graduated 15 December 2010) has published some interesting papers on Dinosaur Trackways. These might be of interest to those teaching Soil Mechanics, to give some examples that might be more stimulating than foundation design or traditional geotechnical engineering.

References below:

Falkingham P.L., Bates K.T., Margetts L. and Manning P.L. (2011) "The 'Goldilocks' effect: Presevational bias in vertebrate track assemblages", Journal of the Royal Society Interface, accepted for publication. Impact factor 4.241.

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phunguyen's picture

Crack penetration in cohesive zone models

Thu, 2010-10-21 09:43 - phunguyen
research
crack
penetration
cohesive zone

Hi all,

I am conducting some cohesive crack simulations within the framework of XFEM. The cohesive model is an initially rigid traction-separation law for mode I.  In order to deal with negative values of the normal sepration/jump, I use a penalty stiffness K.

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Reg. Penetrations in a Contact Analysis Code

Wed, 2009-06-17 09:11 - shrimad
Forums: 
Computational Mechanics Forum
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research
Free Tags: 
penetration
FEA
contact analysis
Offset

Hi,

 

I have developed a FORTRAN code to simulate the molding process of glass to make lenses. Hence, it involves a contact analysis between the glass and molds. The contact is modeled using the master and slave node concept and the mold is assumed to be rigid. For the application of this code, we are looking at highly precise dimensions to capture the curve of the mold on the glass after molding.

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Max penetration error in ABAQUS

Wed, 2008-10-08 10:42 - spawaskar
Forums: 
Biomechanics Forum
Free Tags: 
penetration
computational mechanics
contact mechanics

I am doing contact simulation of soft material. I want to change the default criterion for max penetration error, but can't seem to find how to do it. I tried contact controls relative and absolute penetration tolerances, hcrit but that did not affect the error criterion. Can someone help me please?

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Split singularities and the competition between crack penetration and debond at a bimaterial interface

Thu, 2006-09-07 15:42 - Zhen Zhang
research
suo group research
singularity
crack
penetration
deflection
debond
interface

Zhen Zhang and Zhigang Suo

For a crack impinging upon a bimaterial interface at an angle, the singular stress field is a linear superposition of two modes, usually of unequal exponents, either a pair of complex conjugates, or two unequal real numbers. In the latter case, a stronger and a weaker singularity coexist (known as split singularities). We define a dimensionless parameter, called the local mode mixity, to characterize the proportion of the two modes at the length scale where the processes of fracture occur. We show that the weaker singularity can readily affect whether the crack will penetrate, or debond, the interface.

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