Fatigue properties of vibration‐welded postindustrial waste nylon with glass fibers at room and elevated temperatures

Abstract

The effect of temperature on the tensile and fatigue strength of vibration‐welded and unwelded postindustrial waste nylon 6 reinforced with 30 wt% glass fiber (PIWGF) was experimentally examined, and the results were compared to those obtained from a 30 wt% glass fiber reinforced prime nylon 6 compound (PAGF) from a previous study. Fatigue tests were performed under sinusoidal constant amplitude tension‐tension load at a stress ratio of R = 0.1 and within the frequency range of 2–10 Hz at temperatures from 24 to 120°C. Stress levels from just under the tensile strength down to the run‐out point at 5 million cycles were used. It was found that increasing temperature led to a significant decrease in both tensile strength and fatigue life. For PIWGF, there was ∼20% strength reduction under both static tensile and cyclic loading as compared to PAGF. For both welded and unwelded PIWGF, the endurance ratio; i.e., the ratio of fatigue strength to static tensile strength, was ∼45% regardless of the temperature. The fatigue notch factor (Kf) was between 1.4 and 1.8 for all test temperatures examined. POLYM. ENG. SCI., 55:799–806, 2015. © 2014 Society of Plastics Engineers

Tensile, creep and fatigue behaviours of short fibre reinforced polymer composites at elevated temperatures: a literature survey

“…Increasing temperature has been found to significantly reduce fatigue strength of SFRPCs. 7,28,29,31,62,[66][67][68][69][70][71] Guster et al 66,67 investigated effects of temperature and fibre orientation on fatigue behaviour of 50 wt% short glass fibre reinforced polyamide-6 T/6I specimens with R = 0.1 at 50% relative humidity. Increasing the temperature from 23 to 120°C decreased the fatigue strength considerably.…”

“…Lockwood et al investigated the effect of temperature in the range of 23 to 120 °C on tensile strength of vibration welded and unwelded 30 wt% short glass fibre reinforced nylon‐6. Dog‐bone shape specimens were machined from welded plaques in a way that loading direction was perpendicular to weld line and fibre orientation.…”

“…Lockwood et al studied the effect of temperature ranging between 24 and 120 °C on fatigue strength of vibration‐welded and unwelded short glass fibre polyamide‐6. Fatigue tests were conducted under constant amplitude loading with a stress ratio of R = 0.1 and within frequency range of 2 – 10 Hz.…”

Morphological properties, rheological behaviors, and phase interaction of nylon 11/polypropylene blends by in situ reactive compatibilization and dispersion through polyhydroxybutyrate

“…The formed PP drops are large, and thus the homogeneity is only limited to 70%, which leads to acquiring low strength and modulus. Similarly, many of the researchers used the nanoparticle and polymer as a third phase in the binary blends of nylon6 and PP 31–34 . The introduction of the third phase reduces the surface tension and allows the PP chains to spread throughout the structure of nylon6.…”

“…Similarly, many of the researchers used the nanoparticle and polymer as a third phase in the binary blends of nylon6 and PP. [31][32][33][34] The introduction of the third phase reduces the surface tension and allows the PP chains to spread throughout the structure of nylon6. This uniform distribution of one polymeric phase in other can be observed in compilation with the various mechanisms.…”