Shear lag theory for composite materials (short fibre composites, graphene composites)

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By the end of this video, you should be able to understand:
1. The origin of shear-lag theory
2. Applying the shear-lag theory for modelling the graphene nanoplatelet reinforced composites.
3. Use the experimental techniques (Raman techniques) to identify the shear-lag fitting parameters.
4. Calculate the homogenised properties from the modified rule of mixtures, with the measured the shear-lag fitting parameters and orientation factors.
Some useful references can be found from the two papers:
[1] Young, R.J., 2015. Composite micromechanics: From carbon fibres to graphene. In Structural Integrity and Durability of Advanced Composites (pp. 3-23). Woodhead Publishing.
[2] Papageorgiou, D.G., Kinloch, I.A. and Young, R.J., 2017. Mechanical properties of graphene and graphene-based nanocomposites. Progress in Materials Science, 90, pp.75-127.

[@mfaranmughalUET]

Good lecture..But Brother speak loudly in the next video.

[@齋藤齋藤-z9b]

nice video
from Waseda university

[@kachinaganz8009]

How do we determine the strain of the composite (epsilon c)?

[@mechanicsforengineers]

Use PMMA-SU8 composite as an example, the composite strain is the same as the strain of matrix or fibre, as this is assuming an equal strain for long fibre composite. This can be measured directly from the bulk sample from strain gauge or camera system. The strain of graphene will be measured and calculated by the Raman shift -strain relationship.