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A lower bound of longitudinal elastic modulus for three-phase fibrous composites. (English) Zbl 1425.74406

Summary: A lower bound of the longitudinal elastic modulus of polymer composite materials reinforced with unidirectional continuous fibres is obtained by means of a Differential Calculus approach. In the mathematical derivations, the concept of interphase between the fibre and matrix was also taken into consideration. The three phases are considered as isotropic. The results obtained from the proposed formula were compared with those arising from some reliable and accurate theoretical models as well as with experimental data found in the literature, and a reasonable agreement was observed.

MSC:

74Q20 Bounds on effective properties in solid mechanics
74E30 Composite and mixture properties
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