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Solid core are about 50% stronger, but the adhesive is much stronger in shear than either. I really don't expect a problem. With shear strengh of over 4,000 psi and in excess of 10 square inches on each bond, the 40,000 lb of shear force (and that would be a differential force at the junction) to break the bond will have far more dire consequences than just the bond problem.
It will be interesting to see how this holds up to vibration more than anything else.
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