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Halpin-Kardos Equations
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Definition: These equations have been proposed for the estimation of the strength reduction factor (SRF), which is used to calculate allowable strains (longitudinal, transverse and shear) in the layered composite. This proposal is in compliance with the observation of fiber breakage at its intrinsic strength, but at a reduced composite strength, when a critical fiber aspect ratio is equaled or exceeded. Below the critical value, the composite will fail in the matrix or interfacial region. The critical ratio is expressed as:

(1/d)c = 1/2 (fs/Tm)

where

fs = fiber strength
Tm = matrix shear strength
Definition Copyright ©1989 CRC Press LLC. All rights reserved.

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