Validation of linear damage rules using random loading

Franko, Mitja (author), Sedlaček, Marko (author), Podgornik, Bojan (author), Nagode, Marko (author)

Fatigue damage is a parameter which plays an important role in lifetime and reliability predictions of randomly loaded structures. In this paper, four different forms of the Miner linear accumulation damage rule are examined. They are used to compare observed experimental damage and the results of numerical simulations for both uniaxial and multiaxial fatigue. First, critical fatigue damage values for all forms of the Miner accumulation damage rule are calculated for uniaxial cases. Based on the results presented in this paper, it has been established that for high strength materials the critical damage value is around 0.3. These results are then applied to the multiaxial cases. The multiaxiality is taken into account using either the signed von Mises or critical plane method. Finally, the fatigue fracture surface has been calculated and compared to the experimental pattern of fatigue fracture. The results show that the fatigue fracture surface determined by the numerical simulation is comparable to the fatigue fracture observed experimentally.

• Language: English
• Keywords: damages, multiaxial, fatigue, critical plane, signed von Mises
• Work type: Article
• Typology: 1.01 - Original Scientific Article
• Organization: FS - Faculty of Mechanical Engineering
• Publication status: Published
• Publication version: Author Accepted Manuscript
• Year: 2017
• Number of pages: Str. 463-479
• Numbering: Vol. 26, iss. 3
• PID: 20.500.12556/RUL-105273
• UDC: 531(045)
• ISSN on article: 1056-7895
• DOI: 10.1177/1056789515605881
• COBISS.SI-ID: 14219547
• Publication date in RUL: 19.11.2018

Secondary language

• Language: Slovenian
• Keywords: poškodbe, večosnost, utrujanje, kritična ravnina

Projects

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