| About this Abstract |
| Meeting |
2024 ASC Technical Conference, US-Japan Joint Symposium, D30 Meeting
|
| Symposium
|
2024 ASC Technical Conference, US-Japan Joint Symposium, D30 Meeting
|
| Presentation Title |
Does Micromechanics Work for Predicting the Transverse Tensile Strength of a Composite? |
| Author(s) |
Michael Wisnom |
| On-Site Speaker (Planned) |
Michael Wisnom |
| Abstract Scope |
Analytical and finite element micromechanical models of single fibres surrounded by matrix are often used to deduce the stress state arising in composites loaded in transverse tension. These give useful information about the distribution and concentrations of stresses, but are they able to predict transverse strength from independently measured properties of the fibre, matrix and interface? Analyses typically show large stress concentrations in the matrix and at the interface which suggest that the composite should be much weaker than the matrix itself, but such reductions in strength are not always obtained experimentally. This paper considers the issues of predicting transverse tensile strength and the related difficulties of measuring the strength of the composite and its constituents.
It is argued that the length scale of single fibres is too small because there is insufficient energy to propagate failures that initiate at this level. The critical crack size is much larger than the fibre diameter and so it is weak clusters of a number of fibres close together that are responsible for failure rather than stresses or defects at single fibres. Micromechanical models of multiple fibres can give realistic simulations, but results of single fibre models should be treated with caution. |
| Proceedings Inclusion? |
Definite: Post-meeting proceedings |