The previous section presented various analytical methods for textile structural composites. Experimental work dealing with different composite systems was used in a comparative way to help in evaluating the different models. The logical sequence of results was also incorporated in the evaluation procedure.
The previous mentioned methods could be divided into two main categories: a) Elasticity Techniques: including all Stiffness Averaging Methods, Modified Matrix Method as well as Fiber Inclination Method and Bridging Method; and b) Finite Element Methods: which include the FCM, as well as discrete and continuum techniques.
Elasticity techniques, except for Modified Matrix Method, proved to agree well with experiment. They are relatively easy to implement and insensitive or “forgiving” to geometric descriptions. These models need a failure criterion which probably has to be based on an energy approach.
On the other hand, Finite Element Methods were able to relate the external forces to the internal displacement. They are not easily implemented and are very sensitive to detailed geometric description. They can use a geometrical modelling preprocessor to help identify the geometry for them. The knowledge of internal strains, and consequently stresses, can help to identify strength criteria in the future. This can happen only if the unit cell approach is replaced by a more global one to help account for crack propagation.
All of these models need to be linked' to the real composite production processes. This includes modelling of the processing effects, matrix and fiber architectural variations, macro and micro crimp and twist effects as well as interfacial bonding.
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Gowayed, Y.A., Pastore, C.M. Analytical techniques for the prediction of elastic properties of textile reinforced composites. Mech Compos Mater 28, 393–408 (1993). https://doi.org/10.1007/BF00608607
- Finite Element Method
- Modify Matrix
- Interfacial Bonding
- Strength Criterion
- Geometric Description