Theoretical framework for estimating a product's reliability using a variable-amplitude loading spectrum and a stress-based approach

Moral Portalés, Rubén (author), Bochons Sania, María del Mar (author), Klemenc, Jernej (author)

An innovative approach for predicting the reliability of a structure that is subject to a variable-amplitude dynamic load is presented. In this approach, a Gassner durability curve with its scatter is modelled using a 2-parametric Weibull's probability density function (PDF). The trend of the Gassner durability curve is modelled with a general hyperbola equation in a log-log scale. The hyperbola equation is applied to represent the durability curve for the 63.2% probability of fatigue failure that describes the dependency of the Weibull's scale parameter on the loading spectrum's maximum stress. Equations are derived to link the parameters of the hyperbola curve to the material's S-N curve and the loading spectrum. The Weibull's shape parameter is estimated from the scatter of the material's S-N curve. The proposed Gassner-curve model is applied to calculate the fatigue reliability from the PDF of the loading spectrum's maximum stress and the PDF of the durability-curve's amplitude stress for the selected number of loading-cycles-to-failure. Method for predicting reliability of the structures with a spectrum loading is presented. Durability curve and its scatter are modelled with a 2-parametric Weibull's PDF. Scale parameter of the Weibull's PDF is modelled using a general hyperbola equation. Reliability is calculated on the basis of the modelled durability curve with its scatter.

• Language: English
• Keywords: durability curve, fatigue life reliability, S‐N curve, variable‐amplitude loading, 2‐parametric Weibull PDF
• Work type: Article
• Typology: 1.01 - Original Scientific Article
• Organization: FS - Faculty of Mechanical Engineering
• Publication status: Published
• Publication version: Version of Record
• Year: 2018
• Number of pages: Str. 1662-1673
• Numbering: Vol. 41, iss. 8
• PID: 20.500.12556/RUL-101853
• UDC: 620.178.32(045)
• ISSN on article: 8756-758X
• DOI: 10.1111/ffe.12804
• COBISS.SI-ID: 15958811
• Publication date in RUL: 09.07.2018

Record is a part of a journal

• Title: Fatigue & fracture of engineering materials & structures
• Shortened title: Fatigue fract. eng. mater. struct.
• Publisher: Wiley
• ISSN: 8756-758X
• COBISS.SI-ID: 584210

Licences

• License: CC BY 4.0, Creative Commons Attribution 4.0 International
• Link: http://creativecommons.org/licenses/by/4.0/
• Description: This is the standard Creative Commons license that gives others maximum freedom to do what they want with the work as long as they credit the author.
• Licensing start date: 23.03.2018

Secondary language

• Language: Slovenian
• Keywords: krivulja trajnosti, zanesljivost življenjske dobe utrujenosti, krivulja S-N, obremenitev s spremenljivo amplitudo, 2-parametrični Weibull PDF

Projects

• Funder: ARRS - Slovenian Research Agency
• Project number: P2-0182
• Name: Razvojna vrednotenja