The use of polyethylene copolymers as compatibilizers in carbon fiber reinforced high density polyethylene composites

Savaş, Lemiye Atabek; Tayfun, Ümit; Doğan, Mehmet

doi:10.1016/j.compositesb.2016.06.043

Cited by 79 publications

(46 citation statements)

References 50 publications

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“…A noticeable drop in ratcheting strain ε r over loading cycles in NR/SBR blend containing10 phr nylon fibers is associated with the limited plastic deformation of the rubber blend matrix at localized regions where nylon fibers exist. Savas et al related the fibers constraining plastic deformation in composites to the strong fiber‐matrix bonding restricting the polymeric chain mobility.…”

Section: Discussionmentioning

confidence: 99%

Ratcheting response of nylon fiber reinforced natural rubber/styrene butadiene rubber composites under uniaxial stress cycles: Experimental studies

Vahidifar

Esmizadeh

Naderi

et al. 2017

Fatigue Fract Eng Mat Struct

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The present study intends to study the ratcheting response of nylon fiber reinforced natural rubber (NR)‐styrene butadiene rubber (SBR) composite samples under asymmetric stress cycles. Uniaxial tests conducted on composite samples have shown how influential the weight fraction of short nylon fibers on the stress‐strain curves/loops under monotonic and cyclic loads is. NR/SBR composite samples with various fiber contents of 0, 10, 20, 30, and 40 per hundred rubber (phr) were tested under asymmetric stress cycles. In these tests, stress‐strain hysteresis loops were progressively shifted over stress cycles resulting in progressive plastic strain accumulation. Over stress cycles, ratcheting strain progressed within the first few cycles with a relatively high rate, and as the number of cycles increased, this rate decayed resulting in a plateau in strain accumulation (shakedown). The ratcheting strain rate and magnitude resulting in shakedown were highly affected by the nylon fiber content. The experimental observations showed that this plateau (shakedown) occurred after a number of cycles in NR/SBR composite samples where the widths of hysteresis loops stayed unchanged. Samples with no fiber and that with 10 phr fiber content possessed high ratcheting rates leading samples to failure after a few stress cycles. Fracture surfaces in these samples were further analyzed through SEM investigation.

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Section: Discussionmentioning

confidence: 99%

Ratcheting response of nylon fiber reinforced natural rubber/styrene butadiene rubber composites under uniaxial stress cycles: Experimental studies

Vahidifar

Esmizadeh

Naderi

et al. 2017

Fatigue Fract Eng Mat Struct

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show abstract

“…Because the piezoelectric wafer is attached on the HDPE sheath directly, it is necessary to understand the mechanical properties of HDPE under various temperature but not the steel wires inside. The experimental investigations indicate that HDPE's Young's modulus varies nonlinearly with temperature, and it decreases when the temperature drops . Additionally, the thermal shrinkage of HDPE materials induces additional thermal stresses due to the decrease in temperature.…”

Section: Emi Methods and The Temperature Effectsmentioning

confidence: 99%

“…The experimental investigations indicate that HDPE's Young's modulus varies nonlinearly with temperature, and it decreases when the temperature drops. 53 Additionally, the thermal shrinkage of HDPE materials induces additional thermal stresses due to the decrease in temperature. It is also experimentally shown that the mechanical properties of ice and the piezoelectric wafer depend on the temperature.…”

Section: Emi Methods and The Temperature Effectsmentioning

confidence: 99%

Electromechanical impedance‐based ice detection of stay cables with temperature compensation

Zhang

Zhou

2019

Struct Control Health Monit

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Summary Ice accretion on stay cables is a critical problem for cable‐stayed bridges in a cold climate. Timely and reliable ice detection is a primary and necessary measure for all types of de‐icing solutions. In the study, electromechanical impedance (EMI) method is first proposed to detect ice accretion on the stay cables. This method is extremely sensitive to the small changes in local mass, local stiffness, and temperature, and all of the aforementioned are involved in the icing process on stay cables. With respect to ice detection by using the EMI method, the changes in structural stiffness and mass due to the ice covered are considered as primary characteristics, whereas the change in temperature corresponds to the disturbing factor. Thus, temperature compensation should be implemented during the post processing of experimental data. The proposed method is demonstrated by experiments on a segment of a full‐scale stay cable and with necessary signal processing. The icing process is simulated by spraying water in a low temperature laboratory. The root mean square deviation, relative root mean square deviation, and the characteristic bandwidth are used to quantitatively evaluate the ice accretion. Subsequently, more accurate ice thickness identification is implemented through a trained artificial neural network model. Results indicate that the proposed EMI method with temperature compensation is rapid and feasible for the ice detection of stay cables.

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“…However, addition of clay and elastomer together makes the polymer tougher and increases the impact strength. This situation can be explained by the effect of clay particles on the elastomeric domain sizes [33][34][35]. Elastomeric domains absorb the impact energy and restrict the propagation of the cracks.…”

Section: Impact Testmentioning

confidence: 99%

Mechanical, thermal and rheological characterization of polystyrene/organoclay nanocomposites containing aliphatic elastomer modifiers

Dike

Yilmazer

2020

Mater. Res. Express

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In this study, organoclay containing polystyrene (PS) based nanocomposites were prepared by extrusion in the presence of aliphatic elastomer modifiers. Three different types of aliphatic elastomeric materials and three different types of organoclays were used. Their effects on the morphology, and mechanical, thermal, and rheological properties of PS were investigated by scanning electron microscopy (SEM), transmission electron microscopy (TEM) and x-ray diffraction (XRD), tensile and impact tests, differential scanning calorimetry (DSC), and melt flow index measurements, respectively. Lotader AX8900, Lotader AX8840 and Lotader 2210 were chosen as the aliphatic elastomeric compatibilizers; and Cloisite 15 A, Cloisite 25 A and Cloisite 30B were chosen as the organoclays. The organoclay content was kept constant at 2 wt% and elastomer content was kept constant at 5 wt% throughout the study. Significant improvement is observed on the basal spacing for 30B containing samples according to XRD analysis. SEM studies indicate that the clay particles mostly reside between the PS matrix and the spherical elastomeric domains. Additions of elastomer and organoclay decrease the MFI value of PS. Mechanical test results show that, improvement is observed in elongation at break of unfilled PS with the addition of elastomers. Organoclay addition increases the tensile modulus of PS. According to thermal characterizations, the glass transition temperature (T g ) of PS decreases with elastomer addition, whereas organoclay addition shifts T g values to higher temperatures.

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The use of polyethylene copolymers as compatibilizers in carbon fiber reinforced high density polyethylene composites

Cited by 79 publications

References 50 publications

Ratcheting response of nylon fiber reinforced natural rubber/styrene butadiene rubber composites under uniaxial stress cycles: Experimental studies

Ratcheting response of nylon fiber reinforced natural rubber/styrene butadiene rubber composites under uniaxial stress cycles: Experimental studies

Electromechanical impedance‐based ice detection of stay cables with temperature compensation

Mechanical, thermal and rheological characterization of polystyrene/organoclay nanocomposites containing aliphatic elastomer modifiers

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