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Mechanical behavior of glass fiber‐reinforced Nylon‐6 syntactic foams and its Young's modulus numerical study
Author(s) -
YáñezMacías Roberto,
RiveraSalinas Jorge E.,
SolísRosales Silvia,
OrduñaAltamirano Daniel,
RuízMendoza David,
HerreraGuerrero Adán,
LaraSanchez Jesús,
GonzálezMorones Pablo,
GarcíaHernández Zureima,
HernándezHernández Ernesto,
GregorioJáuregui Karla M.
Publication year - 2021
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.50648
Subject(s) - materials science , composite material , syntactic foam , glass microsphere , ultimate tensile strength , volume fraction , composite number , glass fiber , toughness , fiber , volume (thermodynamics) , silane , modulus , microsphere , chemical engineering , physics , quantum mechanics , engineering
Glass fiber‐reinforced Nylon‐6 syntactic foams (GRSF) were fabricated by melt mixing, adding silane‐modified hollow glass microspheres (HGMf) at 5, 10, 15, and 20 wt% and an impact modifier at 15 wt. Tensile test results showed that the foam's strength increased with the addition of HGMs but started to decrease when the volume fraction of the spheres was higher than 18 vol% (10 wt%). To elucidate the reinforcement mechanism, a numerical simulation of GRSF was carried out. It revealed that HGMs progressively become the reinforcement phase of GRSFs, as their volume fraction increased due to the load transfer occurring more readily in the HGMs than the fiber, which is expected to be the reinforcement. Hence, for a desired weight‐strength ratio, thicker walls are necessary to delay the elastic relaxation of the microspheres and the impairing of the composite as a whole in the context of strength. HGMs with relative wall thickness τ = 0.04 produce an impairing on Young's modulus, if the volume fraction of microspheres is exceeded than 18 vol% because the microspheres are not able to endure increased loads. In addition, a significant reduction of the density was observed by up to 12% in the GRSFs with 30 wt% of both fibers and HGMs. The insight gained of GRSFs role and the numerical simulation achieved through this work, is a significant step toward developing applications of these lightweight materials, since they show good combination of strength, toughness, density, and thermal insulation performance, which can be useful in the automotive, aeronautical and sports industries.