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anisotropy

impact damage due to laminar construction??

Submitted by setareh on Thu, 2011-07-28 12:34.

Hi everyone,

 

According to a book chapter written by NL Hancox, 'Laminar construction of composites which is required if the reinforcing fibres are to be used efficiently and anisotropy reduced, can be a reason why composite laminates are vulnerable to impact damage.'

Now I have three questions;

1-What is meant here by the specified 'laminar construction to reduce anisotropy'?Does it mean to use different orientation for fibres in each ply to have an isotropic material at the laminate level?

2-Why are we interested to make laminates isotropic at all?

3- How can this, make composite laminates more susceptible to failure under impact??

 


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Stephan Rudykh's picture

Stability of anisotropic electroactive polymers with application to layered media

Submitted by Stephan Rudykh on Sat, 2011-06-25 17:35.

The stability of anisotropic electroactive polymers is investigated. A general criterion for the onset of instabilities under plane-strain conditions is introduced in terms of a sextic polynomial whose coefficients depend on the instantaneous electroelastic moduli. In a way of an example, the stable domains of layered neo-Hookean dielectrics are determined. It is found that depending on the direction of the electrostatic excitation field relative to the lamination direction, the critical stretch ratios at which instabilities may occur can be either larger or smaller than the ones for the purely mechanical case.

DOI: 10.1007/s00033-011-0136-1


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Micro-sphere Model

Submitted by Joachim Guilie on Thu, 2010-06-17 18:51.

Hi all,

I am currently working on micro-sphere model like the one used by Miehe, Ihlemann and Pawleski. I wonder if someone know a FEM code who use this type of model.

Thanks a lot

Joachim Guilie

 


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Julian Hallai's picture

EM388F Term Paper: Fracture of Orthotropic Materials under Mixed Mode Loading

Submitted by Julian Hallai on Mon, 2008-04-07 17:11.

The objective of this paper is to analyze the fracture of orthotropic materials, with emphasis on wood.


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