23rd Oct, 2020

Vrije Universiteit Brussel

Question

Asked 22nd Oct, 2020

will the moisture diffusivity of a unidirectional and quasi-isotropic laminate same?

If yes, why?

If no, why?

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Alok Behera you can find more information here:

Yes, fibre orientation affects the moisture diffusion considerably due to the variation in fibre dispersion as well as edge defects at fibre in the composites....

These investigations are helpful, go through these,

1) The effect of fiber orientation angle in composite materials on moisture absorption and material degradation after hygrothermal ageing

2) Effect of geometric dimensions and fibre orientation on 3D moisture diffusion in flax fibre reinforced thermoplastic and thermosetting composites

2 Recommendations

Highlights

•

With increase in temperature, diffusion coefficient and absorbed moisture increased.

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The diffusion coefficient and weight gain are higher in water than sea water.

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Mechanical degradation caused decrease in failure force and maximum displacement.

•

The fiber–matrix interface at higher temperature is weaker than lower temperature.

•

ABAQUS can properly predict the saturation time of aged specimens.

How does ABAQUS calculate strain energy (ALLSE) in a simple tensile/compression test where there is not any damage/braking of material?

Question

3 answers

- Asked 22nd Oct, 2021

- Mustafa Rifat

Hello,

I am trying to understand how abaqus calculates ALLSE (recoverable strain energy) i.e. what is the theory/equation behind it?

I want to replicate the same in MATLAB and to do that, learning the theory is important. I thought it uses a damage model like here (https://abaqus-docs.mit.edu/2017/English/SIMACAETHERefMap/simathe-c-energybalance.htm) and ALLSE is nothing but the expression for E_E in this link.

However, if the simulation does not contain any damage, then we CANNOT use this formulation. What formulation then ABAQUS follows to calculate ALLSE?

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