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Random glass mat reinforced thermoplastic composites. Part II: Analysis of model materials
Author(s) -
Stokes Vijay K.
Publication year - 1990
Publication title -
polymer composites
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.577
H-Index - 82
eISSN - 1548-0569
pISSN - 0272-8397
DOI - 10.1002/pc.750110107
Subject(s) - materials science , composite material , ultimate tensile strength , flexural modulus , modulus , elastic modulus , flexural strength , young's modulus , tensile testing , glass fiber , thermoplastic
The mechanical properties of random continuous glass mat reinforced composites, as determined by standard tensile tests, are known to have a very large scatter. New test procedures have shown that the tensile modulus in these materials can vary by a factor of two over a 12.7‐mm (½‐in) distance. The elastic modulus in a 150 × 305‐mm (6 × 12‐in) plaque can vary by a factor of three. In order to understand the effects of the gauge length on the properties of such materials measured in tensile and flexural tests, a simple model, in which the tensile elastic modulus is modulated by a spacewise sinusoidal variation, has been analyzed. The effect of the functional form of the modulus variation has been assessed by analyzing a square‐wave variation.