micromechanical models based on the mathematical theory of plasticity haveappeared. These include finite element approaches" for a unidirectionally reinforced composite, and various self•consistent models. 6 2 Spencer, Mulhern,and their associates' ' ' have based an elaborate micromechanical model on the assumption that the fibres are inextensional, i.e., incapable of undergoing any elongation whatsoever. Their assumption appears to be unrealistic and their theory too unwieldy to be of practical use for purposes of structural engineering analysis.
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