Loading rate and temperature dependence of flexural behavior in injection-molded glass fiber reinforced polypropylene composites

Yu, Lichao; Ma, Yan

doi:10.1016/j.compositesb.2018.10.035

Cited by 27 publications

(10 citation statements)

References 11 publications

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“…In other words, the time span reflects the time required for the mechanical properties of the material at −60 °C to transform to mechanical properties at 100 °C. It can be concluded that the long-term properties of PP/WP composite sample are based on the matrix, PP, though the addition of wood powder enhanced the mechanical properties of resulting materials, which can be confirmed by the previous study obtained the similar conclusion [43].…”

Section: Resultssupporting

confidence: 78%

Effect of Temperature and Strain Rate on the Flexural Behavior of Wood-Polypropylene Composites

et al. 2019

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The mechanical properties of wood-polypropylene composites exhibit typical viscoelasticity. However, there is little information on the mechanical properties of wood-polypropylene composites related to temperature and time, which limits the use of wood-polypropylene composites as structural components. Here, the effect of time (strain rate) and temperature on the flexural properties and the master curve of the storage modulus used to predict the long-term performance of wood-polypropylene composites were investigated. The results showed that the flexural strength and modulus increased linearly with the increase of wood contend, which can increase by 134% and 257% respectively when the mass fraction of wood powder reached 45%. Moreover, there was a positive linear relationship between flexural strength and ln strain rate, while the flexural strength and modulus decreased as temperature elevated. The storage modulus as a function of frequency (time) and temperature confirmed this trend. To evaluate the long-term performance, the storage modulus master curve was constructed and the respective activation energy was calculated, which revealed that the long-term performance of the samples depended on the matrix and the addition of an appropriate amount of wood powder was beneficial to improve their durability.

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Section: Resultssupporting

confidence: 78%

Effect of Temperature and Strain Rate on the Flexural Behavior of Wood-Polypropylene Composites

et al. 2019

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“…Empirically the relationship between shift factor and the temperature in the master curve is generally expressed by equation (1): where E represents relaxation modulus, T 0 represents the reference temperature, t represents time, T represents temperature, and a T 0 represents horizontal shift factor. The linear relationship between the logarithm of shift factor a T 0 and the reciprocal of temperature (1/ T ) obtained from the master curve of tensile strength agrees quantitatively with an Arrhenius type equation, 24,27,33 as shown in equation (2): where Δ E is activation energy [kJ mol −1 ], R is gas constant [=8.314 × 10 −3 kJ K −1 mol −1 ], and T is the experiment temperature [K]. a T 0 is the shift factor defined as the ratio of the increased theoretical log of time at the reference temperature (25°C) to the log of time at each temperature.…”

Section: Resultssupporting

confidence: 73%

“…Modulus, as well as tensile strength, would increase with the rise in stretching speed according to most of the existing works on injection molded short fiber composites with some exceptions. 27,33–35 However, in this work, at the same temperature with higher tensile speed, elastic modulus did not increase; instead it remained almost stable or even decreased (except when the temperature was over the T g , i.e. 100°C).…”

Section: Resultscontrasting

confidence: 50%

“…The conventional viscoelastic and rheological discussion of composite materials, often used the time-temperature equivalent principle in the mechanical relaxation process. 23,24,26,31,33 In this study, further analysis for determining rheological properties of GF/PETs the TTSP was applied. The time-temperature dependence fitted isotherms of the tensile viscoelasticity of GF/PETs are presented in Figure 8, where tensile strength data points at all temperatures and theoretical stretching time are plotted against the logarithm of time as a minute unit.…”

Section: Resultsmentioning

confidence: 99%

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Time-temperature-dependent mechanical durability analysis of short (glass) fiber-reinforced polyethylene terephthalate injection molding composites with weld line

Miah

Yang

et al. 2022

Textile Research Journal

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The mechanical property and long-term durable life of short fiber composites are inevitably subjected to internal and external influences during molding and afterwards, such as weld, temperature, stress type, and so on. This study was concerned with the influence of weld on mechanical properties of short glass fiber reinforced polyethylene terephthalate injection molding composites and the investigation of their tensile properties at different temperatures and tensile speeds with varying fiber contents. The weld strength was about 50–60% less than the tensile strength at different temperatures and tensile speeds. As the fiber content increased from 15 wt% to 30 wt%, the weld strength was reduced by 10%. The tensile and weld strength were in general inversely proportional to the temperature and linearly proportional to the tensile speed. Tensile modulus showed an inverse association with temperature and a mostly non-linear relation with the tensile speed. The weld line integrity in tensile strength was independent of tensile speed and temperature below the glass transition temperature level. Morphology evaluation testified that the higher test speed emanated better fracture surface fiber–resin adhesion properties with comparatively brittle fracture tensile behavior. The time-temperature superposition principle was applied to find the scope of long-term durability, lifetime prediction and to describe the viscoelastic properties of the welded glass fiber reinforced polyethylene terephthalate composites. An Arrhenius type of shift factor was obtained to fit the tensile strength data which was independent of the fiber contents of the welds. The experimental results can provide a valuable reference for the design and manufacture of short fiber-reinforced composites in long-term durability applications.

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“…The majority of GF‐PP composites are fabricated by injection molding processes. [ 25–28 ] Thermo‐compression molding is one of the most simple and cost‐effective methods for large‐scale processing of thermoplastic long fiber‐reinforced composites, especially in the automotive industry. This process provides longer fiber lengths inside the processed pieces compared with injection molding and extrusion processes.…”

Section: Introductionmentioning

confidence: 99%

Comparison of the physicochemical, rheological, and mechanical properties of core and surface of polypropylene composite (GF50‐PP) plate fabricated by thermocompression process

et al. 2021

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The microstructural properties and rheological behavior of the long‐glass‐fiber‐reinforced polypropylene (GF50‐PP) composite produced by the compression molding process were studied and modeled. Composite plates of GF50‐PP with different thicknesses of 4, 12, and 24 mm have been used to study the effect of glass fiber distribution and various thicknesses on the properties of the core and the surface of the composites. Physicochemical characteristics and rheological behavior of the surface and the core of the plates have been compared. The effect of material sampling area on glass transition temperature, melting temperature, crystallization temperature, degree of crystallinity (Xc), and viscosity were analyzed. Mechanical tests have been carried out to assess the impact of the process parameters on the mechanical characteristics. The results showed that in the compression molding process, three competing parameters should be considered: the Xc, fiber accumulation, and presence of porosity. One can note that this study is applicable to present the relation or interaction between process, microstructure, and properties of the GF50‐PP composite prepared by the thermocompression method.

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Loading rate and temperature dependence of flexural behavior in injection-molded glass fiber reinforced polypropylene composites

Cited by 27 publications

References 11 publications

Effect of Temperature and Strain Rate on the Flexural Behavior of Wood-Polypropylene Composites

Effect of Temperature and Strain Rate on the Flexural Behavior of Wood-Polypropylene Composites

Time-temperature-dependent mechanical durability analysis of short (glass) fiber-reinforced polyethylene terephthalate injection molding composites with weld line

Comparison of the physicochemical, rheological, and mechanical properties of core and surface of polypropylene composite (GF50‐PP) plate fabricated by thermocompression process

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