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Technical Discussions
09:36 Jun-23-2016
Detection of unbonds in honeycomb sandwich using MIA


I would like to clarify for the detection of unbonds in honeycomb sandwich using MIA

1. For the stiffness differences that the MIA method is detecting, is there any contribution to this stiffness difference from the composite face-sheet on the opposite side or is it mainly due to the honeycomb core that the face-sheet is bonded to?

I.e. we are comparing stiffness of near-side face-sheet only (for unbond) versus

Case 1: honeycomb core + near-side face-sheet only (good area)
Case 2: honeycomb core + near-side face-sheet + far-side face-sheet (good area)

Assume CFRP face-sheet of 2-3 plies so around 0.5mm thick and Nomex Honeycomb of about 5mm thick.

2. What is the effect of the probe diameter on the detection performance?

Thanks for the help!!

Engineering, IRT Researcher
VISIOOIMAGE INC., Canada, Joined Feb 2012, 11


Engineering, IRT Researcher
Joined Feb 2012
03:39 Jun-28-2016
Re: Detection of unbonds in honeycomb sandwich using MIA
In Reply to wei at 09:36 Jun-23-2016 (Opening).

Hi Wei,
May be there is a delamination between the sheet (monolithic) and the honeycomb.
I suggest you to use infrared thermography method (IRT) to check this.

10:59 Jun-28-2016
Re: Detection of unbonds in honeycomb sandwich using MIA
In Reply to Adel at 03:39 Jun-28-2016 .

Hi Adel,

Thanks for suggestion.

I am considering the use of Mechanical Impedance Analysis due to the geometry. It will be for inspection of radius. So not sure if thermography is suitable for that.


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