An accelerated multilevel test and design procedure for polymer gears

Pogačnik, A.; Tavčar, Jože

doi:10.1016/j.matdes.2014.10.016

Cited by 70 publications

(51 citation statements)

References 20 publications

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“…Polymer gear can fail in two typical ways, fatigue or sudden melting as reported in the research by A. Pogacnik and J. Tavcar [23]. A new multilevel accelerated testing procedure was proposed by the authors and the results which are life span and gear temperature were compared with a calculation procedure.…”

Section: Firstmentioning

confidence: 99%

A review on failure characteristics of polymer gear

et al. 2016

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Abstract.Polymer are now widely used as substitute material for steel gear in low load devices. Its failure differs from gears made of steel, thus it is important to categorize the failures shown by polymer gears. Several previous studies noted that wear detection, microstructure surface condition monitoring, weight loss and temperature detection can be used in detecting failure of polymer gear. This article reviews the failure detection method mentioned above. Other researcher works were studied and their findings were extracted in order to identify the methods they used. The most common method used was wear detection and it was supplemented by other methods such as microstructure surface condition monitoring. Failures shown by polymer can be concluded to be tooth breakage, tooth deformation, material removal and surface fatigue.

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Section: Firstmentioning

confidence: 99%

A review on failure characteristics of polymer gear

et al. 2016

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“…All the gear pairs were running without lubrication. The values of the coefficient of friction for the analysed material pair POM/PA6 in non-lubricated conditions range between 0,18 [2] and 0,29 [10], depending on the source. Lifetime of tested gears was determined for moment loads from 0,8 to 1,5 N·m.…”

Section: Testing Conditionsmentioning

confidence: 99%

“…Polymer gears tend to fail in two typical ways: due to fatigue (cracked flank surface and fractures in the root), and due to material softening [10]. For the moment loads at which the gears were tested, temperature-induced defects were expected.…”

Section: Types Of Defectsmentioning

confidence: 99%

“…Therefore, for the purpose of dimensioning and using plastic gears in real applications, the gears should be tested in operating or similar conditions [8]. Because this testing is time consuming and expensive, researchers are also using accelerated testing, where the moment load of a gear pair is incrementally added [9,10]. The goal of such tests is to determine the critical load at which the gear pair fails.…”

Section: Introductionmentioning

confidence: 99%

“…In the final phase of dimensioning the gears the interest is always in whether a gear under a particular load will achieve the target number of operating cycles. Therefore, research continues in the direction of predicting the lifetime of polymer gears [10] and characterizing the impact parameters that affect the lifetime.…”

Section: Introductionmentioning

confidence: 99%

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The effect of the teeth profile shape on polymer gear pair properties

2016

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Original scientific paper The paper presents an extensive research on two different tooth-flank geometries, i.e. involute and S-gears. A significant difference between the two analyzed geometries was observed during the lifetime testing. The tests were conducted on special test equipment with an axis distance of 20 mm. The material used for the tested gears was POM for the driver gear and PA6 for the driven gear. The same sizes of driver and driven gears were used (m = 1 mm, z = 20). Gears of this size are particularly suitable for micro-gear transmissions. The tests were carried out using different rotational speeds and torques, between 0,8 N·m and 1,5 N·m. During testing the thermal state of the gears was measured with a thermal camera. The stress and deformation analyses of the tested gears were undertaken using numerical simulations employing the finite-element method. Keywords: failure; involute gears; polymer; S-gears; temperature Utjecaj oblika profila zuba na svojstva para polimernih zupčanikaOriginal scientific paper U radu se predstavlja opsežno istraživanje dviju različitih geometrija boka zuba t.j. evolventnih i S-zupčanika. Zapažena je značajna razlika između te dvije analizirane geometrije tijekom ispitivanja njihovog vijeka trajanja. Ispitivanja su provedena na posebnoj opremi za ispitivanje s udaljenošću vratila od 20 mm. Materijal ispitivanih zupčanika bio je POM za pogonski zupčanik i PA6 za pogonjeni zupčanik. Rabljene su iste veličine pogonskog i pogonjenog zupčanika (m = 1 mm, z = 20). Zupčanici te veličine su naročito pogodni za mikro zupčanični prijenos. Ispitivanja su provedena uz različite brzine vrtnje i okretne momente, između 0,8 N·m i 1,5 N·m. Tijekom ispitivanja toplinskom se kamerom mjerilo toplinsko stanje zupčanika. Analize naprezanja i deformacije ispitivanih zupčanika provedene su numeričkom simulacijom primjenom metode konačnih elemenata.

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