Robustness evaluation using highly accelerated life testing

Charki, Abdérafi; Laronde, Rémi; Guérin, Fabrice; Bigaud, David; Coadou, F.

doi:10.1007/s00170-011-3264-z

Cited by 14 publications

(15 citation statements)

References 3 publications

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“…Researchers have investigated different methods that correlate the lifetime under accelerated test conditions to the lifetime under normal conditions [23,24]. To reduce the duration of the tests, a highly accelerated life testing method (known as HALT) can be used.…”

Section: Accelerated Testingmentioning

confidence: 99%

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An accelerated multilevel test and design procedure for polymer gears

Pogačnik

Tavčar

2015

Materials & Design (1980-2015)

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Section: Accelerated Testingmentioning

confidence: 99%

Section: Accelerated Testingmentioning

confidence: 99%

An accelerated multilevel test and design procedure for polymer gears

Pogačnik

Tavčar

2015

Materials & Design (1980-2015)

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“…Reliability and durability testing requires a large number of tests because of uncertainty. Researchers have investigated different methods that correlate the lifetime under accelerated Tavčar, Grkman and Duhovnik, Journal of Advanced Mechanical Design, Systems, and Manufacturing, Vol.12, No.1 (2018) test conditions to the lifetime under normal conditions (Charki, 2011), (Gouno, 2007). To reduce the duration of the tests, a highly accelerated life testing method (known as HALT) can be used.…”

Section: Introductionmentioning

confidence: 99%

“…It is an effective approach because it is conducted at relatively high stresses for short periods of time. It is very important to prepare a test plan that can effectively assess the robustness of the product (system) for short duration tests (Charki, 2011). An alternative to HALT testing is stepstress accelerated life testing (SSALT), a subsection of the accelerated life test (ALT) family.…”

Section: Introductionmentioning

confidence: 99%

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Accelerated lifetime testing of reinforced polymer gears

Tavčar

Grkman

Duhovnik

2018

JAMDSM

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The main advantages of polymer gears compared to metal gears are low manufacturing costs for mass production, vibration damping, and there is no need for a lubricant. In the literature and guidelines, the allowable gear endurance limits for bending and contact stresses are mainly given for polyamides (PA) and polyacetals (POM). A large number of suitable polymer gear materials is available, but the standards offer little support for the lifetime calculations of polymer gears from other materials. Therefore, the testing of gear geometry and materials combinations cannot be avoided in the design of an optimal gear drive. However, gear testing is very time-consuming and expensive, especially when testing several different material combinations in different testing conditions. By applying the upgraded accelerated testing procedure, gear test time and costs can decrease significantly. Determination of the gear temperature during meshing is needed for the precise calculation of plastic gears. The presented temperature calculation model is corrected and improved with input parameters, which were determined from the test results. Accelerated tests were conducted on different combinations of reinforced and unreinforced commercially available materials: PA6, PA66, POM and PPS. Glass and carbon fiber were used for reinforcement. The research goal was characterization of different material pairs with the coefficient of friction, time strength, wear, and the failure mechanism in relation to load cycles and load level. The paper's contribution are some general guidelines for selecting polymer material for gears, such as fiber reinforcement improves the allowable stress level at up to a few million load cycles; unreinforced polymers are better for a higher number of load cycles. Also, PTFE -the internal lubricant significantly reduces a coefficient of friction if added to PA polymers, and is less efficient in combination with POM.

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Robustness study and reliability growth based on exploratory design of experiments and statistical analysis: a case study using a train door test bench

Cauffriez¹,

Loslever²,

Caouder³

et al. 2012

Int J Adv Manuf Technol

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This paper presents a methodology to improve the reliability/robustness of a complex mechatronic system for passenger access, which is greatly stressed over its life cycle. The proposed methodology aims to weed out design problems during the development phase and to test the robustness of the passenger access system under operating conditions as close to the real service conditions as possible. The empirical study process is based on an experimental design series in order to cover a complex experimental domain in a reasonable number of tests for each experimental design. The exploratory aspect that stands in the experimental stage also stands in the data analysis stage thanks to a descriptive multivariate approach that reduces the initial information as less as possible. An application concerning the passenger access system for a train is presented. The experimental process is mainly based on the D-optimal design and is used with a 1:1 scale test bench. An example with five input factors is presented; the output data consist in a multidimensional signal containing open/close cycles that may be perturbed. The statistical analysis process starts by considering a scale windowing while beeping both time and multivariate aspects. The frequency values are then investigated using multiple correspondence analysis. Advantages and disadvantages of the proposed design of experiments and data analysis are discussed.

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Robustness evaluation using highly accelerated life testing

Cited by 14 publications

References 3 publications

An accelerated multilevel test and design procedure for polymer gears

An accelerated multilevel test and design procedure for polymer gears

Accelerated lifetime testing of reinforced polymer gears

Robustness study and reliability growth based on exploratory design of experiments and statistical analysis: a case study using a train door test bench

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