The dominant effect of temperature on the fatigue behaviour of polymer gears

Kalin, Mitjan; Kupec, Alja

doi:10.1016/j.wear.2017.02.003

Cited by 63 publications

(25 citation statements)

References 23 publications

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“…Polymer gears are used widely in many engineering applications, such as office appliances, mechatronic devices, household facilities, computer and laboratory equipment, medical instruments, etc. [ 1 , 2 , 3 , 4 ]. These polymer gears can be produced by classical cutting processes or, for large series production, by injection moulding [ 5 , 6 ].…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation of the Wear Behaviour of Coated Polymer Gears

et al. 2021

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A comprehensive experimental investigation of the wear behaviour of coated spur polymer gears made of POM is performed in this study. The three physical vapour deposition (PVD) coatings investigated were aluminium (Al), chromium (Cr), and chromium nitrite (CrN). Al was deposited in three process steps: By plasma activation, metallisation of Al by the magnetron sputtering process, and by plasma polymerisation. Cr deposition was performed in only one step, namely, the metallization of Cr by the magnetron sputtering process. The deposition of CrN was carried out in two steps: the first involved the metallization of Cr by the magnetron sputtering process while the second step, vapour deposition, involved the reactive metallisation of Cr with nitrogen, also by the magnetron sputtering process. The gears were tested on an in-house developed testing rig for different torques (16, 20, 24 and 30 Nm) and rotational speed of 1000 rpm. The duration of the experiments was set to 13 h, when the tooth thickness, and, consequently, the wear of the tooth flank was recorded. The experimental results showed that the influence of metallisation with aluminium, chromium, and chromium nitrite surface coatings on the wear behaviour of the analysed polymer gear is not significant. This is probably due to the fact that the analysed coatings were, in all cases, very thin (less than 500 nm), and therefore did not influence the wear resistance significantly. In that respect, an additional testing using thicker coatings should be applied in the further research work.

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Section: Introductionmentioning

confidence: 99%

Experimental Investigation of the Wear Behaviour of Coated Polymer Gears

et al. 2021

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“…Several studies have assigned "run-out" limits to conclude gear tests. 6,21,22 Accordingly, a "run-out" limit of two million cycles was considered a termination criterion for trials in which no failure occurred. The fatigue strength of the test gears, corresponding to 10 million cycles, was not determined due to the constraints with testing duration.…”

Section: Test Methodologymentioning

confidence: 99%

Effect of metal and polymer mating gears on the bending fatigue performance of asymmetric polymer gears

Pandian

Gautam

Senthilvelan

2021

Proceedings of the Institution of Mechanical Engineers, Part L:

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The material of the mating gear influences the fatigue life of polymer gears. The bending fatigue characteristics of polyamide 66 asymmetric gears (34°/20° and 20°/34°) corresponding to steel–polymer and polymer–polymer material combinations were investigated. The performance of symmetric gear pairs (20°/20°) was determined to serve as a comparison. Quasi-static numerical simulations were performed in a finite element analysis tool to predict root bending stress, load sharing ratio, and tooth deflection. The bending fatigue strength of steel–polymer and polymer–polymer pairs of each test configuration was determined using bending fatigue tests. The load sharing ratio and root bending stress of polymer–polymer pairs decreased substantially compared to steel–polymer pairs. The extent of deflection-induced load sharing was greater in polymer–polymer pairs. The bending fatigue life of polymer–polymer pairs was lower than that of steel–polymer pairs owing to the higher operating temperature. In polymer–polymer pairs, polymer driving and driven gears increased the heat generated and diminished the heat dissipation to the environment. In steel–polymer and polymer–polymer pairs, the configuration with the highest bending fatigue strength was 34°/20° and 20°/34°, respectively. This divergence was caused by the increase in temperature difference between the two configurations for polymer–polymer pairs. Analysis of hysteresis loops indicated that the loop area was higher for polymer–polymer pairs, signifying the increased amount of dissipated energy. No noticeable variation was observed between the failure modes of steel–polymer and polymer–polymer pairs despite the significant difference in the operating temperatures. The bending stress and operating temperature were the dominant factors affecting the performance of steel–polymer and polymer–polymer gear pairs, respectively.

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“…The run-out limit was selected based on the literature review. Kalin and Kupec 29 set two million as the limit for stopping the tests. Mao et al.…”

Section: Test Methodologymentioning

confidence: 99%

Experimental and numerical investigation of the bending fatigue performance of symmetric and asymmetric polymer gears

Pandian

Gautam

Selvaraj

2020

Proceedings of the Institution of Mechanical Engineers, Part L:

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In this work, the bending fatigue strengths of injection-molded symmetric and asymmetric nylon 66 gears were evaluated experimentally, and the results were substantiated using numerical studies. The symmetric (20°/20°) and asymmetric (34°/20° and 20°/34°) configurations were subjected to bending fatigue tests under a load controlled mode. The bending stresses of the symmetric and asymmetric gears were predicted by quasi-static simulations using a commercial finite element analysis software. The form factor ([Formula: see text]) and the stress correction factor ([Formula: see text]) were computed using an adapted ISO method. The 34°/20° configuration exhibited the lowest bending stress and highest bending fatigue life among the tested configurations. The form factor exerted a decisive influence on the magnitude of the bending stress compared to the stress correction factor. For the considered loading conditions, deflection-induced load sharing occurred in the 20°/20° and 20°/34° configurations but was absent in the 34°/20° configuration. Failure analysis indicated that a high stress concentration caused multiple cracks in the fillets of asymmetric gears.

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The dominant effect of temperature on the fatigue behaviour of polymer gears

Cited by 63 publications

References 23 publications

Experimental Investigation of the Wear Behaviour of Coated Polymer Gears

Experimental Investigation of the Wear Behaviour of Coated Polymer Gears

Effect of metal and polymer mating gears on the bending fatigue performance of asymmetric polymer gears

Experimental and numerical investigation of the bending fatigue performance of symmetric and asymmetric polymer gears

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