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Rotating bending fatigue is the most commonly encountered loading in most machines and machine tools. At the same time, modern literature in this area is very little. EN31 steel is a steel which is commonly used in load bearing applications which encounters fatigue loading. Further, studies on heat treated EN31 steel to improve fatigue strength is...
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... increase is ~2.2 times in water quenched ones and ~2.5 times in gingili oil quenched ones Thus there is ~120% increase in the UTS life of the water quenched specimens and ~150% increase in case of gingili oil quenched specimen. Figure 4, indicates the UTS of untreated, water treated and gingili oil treated specimens. ...
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The fretting wear among the steel wires aggravates the wire rope’s fatigue damage, affects the service performance of the wire ropes, and threatens mine hoisting safety. In this paper, the practical friction behavior and wear mechanism among the wires in the wire rope are investigated. A series of tests were carried out on multiple steel wires in h...
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... The test results showed that fatigue resistance with the quenching media of air was superior to that with the quenching media of water which was superior to the oil when the austenized temperature was 850 or 800 • C. This was different from the case with the austenized temperature of 900 or 950 • C. It has been observed by Harichandra et al. (2016) that the specimens of EN31 steel quenched in gingili oil have 10 times more fatigue life than the specimens quenched in the water and 100 times more than unquenched specimens in high-cycle rotating bending fatigue tests. ...
In this work, the effect of the quenching media (brine,
water, and two types of naphthenic mineral oils) and the tempering
temperature (200, 400, 600 ∘C) on the static mechanical properties
and the fatigue life has been investigated using 300 fatigue and 36 static
tension tests. S–N curves and standard deviations of fatigue life under each
heat treatment condition were calculated and shown. The fracture surfaces of
the selected 11 specimens were observed by the scanning electron microscope
and the reasons of affecting the fatigue life were discussed. To estimate
the mean fatigue life under the conditions of any given tempering
temperature and cycle stress amplitude based on 300 fatigue tests, the mean
fatigue life estimation method based on RBF neural network was presented and
verified by 12 other fatigue tests. The test results have shown that (1) the
mean fatigue life decreases with the increase of tempering temperature for
the same quenching media, (2) the mean fatigue life using brine is more than
water which is more than naphthenic mineral oils for the same tempering
temperature, and (3) the proposed method based on RBF neural network could
accurately estimate the mean fatigue life when the tempering temperature and
cyclic stress amplitude are given for each quenching medium.
Polyamide 6 (PA6)-based composite materials have shown attractive mechanical properties for structural applications. However, their tribological properties have not been much improved till date. Therefore, influence of graphite (Grt) with variation of 1, 3, and 5 mass% on the mechanical and tribological behaviours of 5 mass% glass fibre (GF)-reinforced injection moulded PA6 composites has been studied. This study describes the fabrication and experimental evaluation of Grt-reinforced PA6/GF composites (e.g., PA6/5GF/1Grt, PA6/5GF/3Grt, and PA6/5GF/5Grt). The coefficient of friction (COF) and dry wear properties were evaluated under ambient conditions at variable rotating speeds of 200, 400 and 800 rpm, and normal loads of 10, 20 and 30 N for a fixed run-time of 30 min. SEM and optical microscopy revealed the morphology and wear mechanisms of worn surfaces. Among all the developed composites, 1 mass% of graphite-reinforced PA6/5GF composite had shown noticeably enhanced the tribological (0.20–0.26 COF) and mechanical (45 MPa tensile strength and HRB 47 hardness) characteristics compared to pure PA6, other prepared composites and also some other reported similar composite systems. The thermogravimetric analysis revealed that the optimal thermal stability can be achieved by PA6/5GF/1Grt composite, which, thus, can be used for further applications.
