On Step-Stress Partially Accelerated Life Testing with Competing Risks Under Progressive Type-II Censoring

El-Azeem, S. O. Abd; Abu‐Moussa, Mahmoud H.; El-Din, M. M. Mohie; Diab, L. S.

doi:10.1007/s40745-022-00454-0

Cited by 6 publications

(3 citation statements)

References 31 publications

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“…Utilizing materials and processing circumstances close to those of the helix upper dispenser, the constitutive material properties such as PC (helix upper dispenser) were decided. As a consequence, the stress of the parts by FEA inspection was lessened from 45.0 kPa to 20.0 kPa (Figure 15) [40,41]. As the matter of the bearing in an auger motor was modified and the strengthened rib of the helix upper dispenser was thickened, the lifetime of an ice-maker was expanded.…”

Section: Resultsmentioning

confidence: 99%

Improving the Fatigue Design of Mechanical Products Such as Bearings Based on a (Generalized) Life-Stress Prototype and Sample Size

Woo¹,

O’Neal²,

Hassen³

et al. 2023

Preprint

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To prolong the fatigue life of a product handled by machine, parametric accelerated life testing (ALT) is mentioned as an organized technique to pinpoint design flaws and minimize fatigue-connected failures. It requires (1) an ALT procedure, (2) fatigue model, (3) parametric ALTs with adjustment, and (4) an approximate of whether present product complete the BX life. The use of a quantum-transported time-to-failure archetype and a sample size are advised. The improvements in the reliability of a refrigerator ice-maker, comprising an auger motor with bearing, were utilized as a case investigation. In the 1st ALT, a steel rolling bearing cracked due to repeated loads under cold circumstances (below −20 C) in the freezer compartment. The bearing was altered by adjusting the matter from AISI 52100 alloy steel with 1.30-1.60% chromium to lubricated sliding bearing with sintered and hardened steel (FLC 4608-110HT) because of its high fatigue strength at lower temperatures. In the 2nd ALT, a helix made of polycarbonates (PCs) fractured. As an adjustment, a reinforced rib of the helix was thickened. As no troubles in the 3rd ALT occur, the lifetime of an ice-maker was proved to be B1 life 10 years.

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Section: Resultsmentioning

confidence: 99%

Improving the Fatigue Design of Mechanical Products Such as Bearings Based on a (Generalized) Life-Stress Prototype and Sample Size

Woo¹,

O’Neal²,

Hassen³

et al. 2023

Preprint

View full text Add to dashboard Cite

show abstract

“…Utilizing materials and processing circumstances close to those of the helix upper dispenser, the constitutive material properties such as PC (helix upper dispenser) were discovered. As a consequence, the stress of the parts by the FEA inspection was lessened from 45.0 kPa to 20.0 kPa (Figure 14) [42,43]. As the material of the bearing in an auger motor was modified and the strengthened rib of the helix upper dispenser was thickened, the lifetime of an ice-maker was expanded.…”

Section: Resultsmentioning

confidence: 99%

Enhancing the Fatigue Design of Mechanical Systems Such as Refrigerator to Reserve Food in Agroindustry for the Circular Economy

Woo¹,

O’Neal

Hassen³

et al. 2023

Sustainability

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To prolong the fatigue life of a product handled by machines such as refrigerators and agricultural machinery, parametric accelerated life testing (ALT) is recommended as a systemized approach to detect design inadequacies and reduce fatigue. It demands (1) an ALT strategy, (2) a fatigue type, (3) parametric ALTs with change, and (4) an estimate of whether the present product completes the BX lifetime. The utilization of a quantum-transported life-stress type and a sample size are advocated. The enhancements in the lifetime of a refrigerator ice-maker, containing an auger motor with bearings, were employed as a case study. In the 1st ALT, a steel rolling bearing cracked due to repeated loading under cold conditions (below −20 °C) in the freezer compartment. The bearing material was changed from an AISI 52100 Alloy Steel with 1.30–1.60% chromium to a lubricated sliding bearing with sintered and hardened steel (FLC 4608-110HT) because of its high fatigue strength at lower temperatures. In the 2nd ALT, a helix made of polycarbonates (PCs) fractured. In the redesign, a reinforced rib of the helix was thickened. Because no troubles in the 3rd ALT happened, the life of an ice-maker was proven to have a B1 life 10 years.

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“…Hakamipour (2020) designed a step-stress ALT plan for a generalized exponential failure model under progressively Type-I censoring scheme for the approximated optimal design plan. El-Azeem et al (2022) studied SSPALT with competing risks when the lifetime of test units follows the Nadarajah-Haghighi failure model. The maximum likelihood estimates and Bayes estimates of the model parameters are derived under a progressive Type-II censoring plan.…”

Section: Introductionmentioning

confidence: 99%

Warranty costs analysis under accelerated life test for power Ishita distribution with type-I censored data

Alam

Haq

Sharma³

et al. 2023

IJQRM

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PurposeIn this paper, the authors design accelerated life test and provide its application in the field of accelerated life test. The authors use maximum likelihood estimation method as a parameter estimation method.Design/methodology/approachIn this paper we design accelerated life test and provide its application in the field of accelerated life test. The authors use maximum likelihood estimation method as a parameter estimation method.FindingsIn this study, the authors design accelerated life test under Type-I censoring when the lifetime of test items follows PID and also provides its application in the field of warranty policy. The following conclusion is made on the basis of this study. (1) An inverse relationship is shown between the shape parameter with the expected total cost and expected cycle time, while the shape parameter directly relates to the expected cost rate (see Table 5). (2) A direct relationship is shown between the scale parameter with the expected total cost and expected time cycle, while the inverse relationship is shown with the expected cost rate (see Table 5). (3) An inverse relationship is shown between the replacement age and the expected cost rate, while there are direct relationships between expected total cost and expected time cycle (see Table 5).Originality/valueThis paper is neither published or neither accepted anywhere.

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On Step-Stress Partially Accelerated Life Testing with Competing Risks Under Progressive Type-II Censoring

Cited by 6 publications

References 31 publications

Improving the Fatigue Design of Mechanical Products Such as Bearings Based on a (Generalized) Life-Stress Prototype and Sample Size

Improving the Fatigue Design of Mechanical Products Such as Bearings Based on a (Generalized) Life-Stress Prototype and Sample Size

Enhancing the Fatigue Design of Mechanical Systems Such as Refrigerator to Reserve Food in Agroindustry for the Circular Economy

Warranty costs analysis under accelerated life test for power Ishita distribution with type-I censored data

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