An experimental study was conducted to investigate the effects of temperature and strain rate on tensile behavior of polybutylene terephthalate and polyamide-6 reinforced with short glass fibers. Tension tests were performed in several mold flow directions, at a range of temperatures between −40°C and 125°C, and a range of strain rates between 5 × 10−5 s−1 and 5 × 10−1 s−1. Mathematical relationships were developed to represent the stress–strain response, as well as tensile strength and elastic modulus in terms of strain rate and temperature. Time–temperature superposition principle was also employed to superimpose the effect of temperature and strain rate on tensile strength. A temperature-dependent shift factor of Arrhenius type is suggested, which is independent of the mold flow direction. Mechanisms of tensile failure were also identified from fractured surface of specimens.
MortazavianSFatemiA. Fatigue behavior and modeling of short fiber reinforced polymer composites: a literature review. Int J Fatigue2015; 70: 297–321.
2.
GüllüAÖzdemirAÖzdemirE. Experimental investigation of the effect of glass fibres on the mechanical properties of polypropylene (PP) and polyamide 6 (PA6) plastics. Mater Des2006; 27: 316–323.
3.
RamsteinerFTheysohnR. The influence of fibre diameter on the tensile behaviour of short-glass-fibre reinforced polymers. Compos Sci Technol1985; 24: 231–240.
4.
FuSYLaukeBMäderE. Tensile properties of short-glass-fiber- and short-carbon-fiber-reinforced polypropylene composites. Compos Part A Appl Sci Manuf2000; 31: 1117–1125.
5.
ThomasonJL. The influence of fibre length and concentration on the properties of glass fibre reinforced polypropylene: 5. Injection moulded long and short fibre PP. Compos A Appl Sci Manuf2002; 33: 1641–1652.
6.
WangZZhouYMallickPK. Effects of temperature and strain rate on the tensile behavior of short fiber reinforced polyamide-6. Polym compos2002; 23: 858–871.
7.
ZhouYMallickPK. A non-linear damage model for the tensile behavior of an injection molded short E-glass fiber reinforced polyamide-6,6. Mater Sci Eng A2005; 393: 303–309.
8.
De MonteMMoosbruggerEQuaresiminM. Influence of temperature and thickness on the off-axis behaviour of short glass fibre reinforced polyamide 6.6–Quasi-static loading. Compos A Appl Sci Manuf2010; 41: 859–871.
9.
MortazavianSFatemiA. Effects of fiber orientation and anisotropy on tensile strength and elastic modulus of short fiber reinforced polymer composites. Compos B Eng2015; 72: 116–129.
10.
ValentinDParayFGuettaB. The hygrothermal behaviour of glass fibre reinforced PA66 composites: a study of the effect of water absorption on their mechanical properties. J Mater Sci1987; 22: 46–56.
11.
BergeretAPiresIFoulcMP. The hygrothermal behaviour of glass-fibre-reinforced thermoplastic composites: a prediction of the composite lifetime. Polym Test2001; 20: 753–763.
12.
PedrosoAGMeiLHIAgnelliJAM. The influence of the drying process time on the final properties of recycled glass fiber reinforced polyamide 6. Polym Test2002; 21: 229–232.
13.
LyonsJS. Time and temperature effects on the mechanical properties of glass-filled amide-based thermoplastics. Polym Test1998; 17: 237–245.
14.
BastioliCGuanellaIRomanoG. Effects of water sorption on the physical properties of PET, PBT, and their long fibers composites. Polym Compos1990; 11: 1–9.
15.
CarrascalICasadoJAPolancoJA. Absorption and diffusion of humidity in fiber glass-reinforced polyamide. Polym Compos2005; 26: 580–586.
16.
MortazavianSFatemiAKhosrovanehA. Effect of water absorption on tensile and fatigue behaviors of two short glass fiber reinforced thermoplastics. SAE Int J Mater Manuf2015; 8(2): 435–443.
17.
ShiXQWangZPPangHLJ. Investigation of effect of temperature and strain rate on mechanical properties of underfill material by use of microtensile specimens. Polym Test2002; 21: 725–733.
18.
MouhmidBImadABenseddiqN. A study of the mechanical behaviour of a glass fibre reinforced polyamide 6,6: experimental investigation. Polym Test2006; 25: 544–552.
19.
SchoßigMBierögelCGrellmannW. Mechanical behavior of glass-fiber reinforced thermoplastic materials under high strain rates. Polym Test2008; 27: 893–900.
20.
PetersonBLPangbornRNPantanoCG. Static and high strain rate response of a glass fiber reinforced thermoplastic. J Compos Mater1991; 25: 887–906.
21.
HashemiS. Temperature, strain rate and weldine effects on strength and micromechanical parameters of short glass fibre reinforced polybutylene terephthalate (PBT). Polym Test2011; 30: 801–810.
22.
SchultzJMFriedrichK. Effect of temperature and strain rate on the strength of a PET/glass fibre composite. J Mater Sci1984; 19: 2246–2258.
23.
MiwaMHoribaN. Strain rate and temperature dependence of tensile strength for carbon/glass fibre hybrid composites. J Mater Sci1993; 28: 6741–6747.
24.
ASTM D638:2010. Standard test method for tensile properties of plastics.
25.
ISO 527:1993. Plastics – determination of tensile properties.
26.
ASTM E646:2007. Standard test method for tensile strain-hardening exponents (n-values) of metallic sheet materials.
27.
ChouSCRobertsonKDRaineyJH. The effect of strain rate and heat developed during deformation on the stress-strain curve of plastics. Exp Mech1973; 13: 422–432.
28.
RichetonJAhziSVecchioKS. Influence of temperature and strain rate on the mechanical behavior of three amorphous polymers: characterization and modeling of the compressive yield stress. Int J Solids Struct2006; 43: 2318–2335.
MortazavianSFatemiA. Tensile and fatigue behaviors of polymers for automotive applications. Materialwissenschaft und Werkstofftechnik2015; 46: 204–213.
