Elastoplastic response of a pipe bend using Prandtl operator approach in a finite element analysis

Šeruga, Domen (author), Klemenc, Jernej (author), Oman, Simon (author), Nagode, Marko (author)

Structural components are subjected to variable thermomechanical loads during use. These loads can lead to fatigue failure therefore it is important to detect potential weak points in the structure already during early stages of the R&D process. Reliable results of the stress-strain response are of crucial importance during the structural analyses. In this paper, a metallic pipe bend is subjected to a variable thermomechanical load and its structural response is investigated. The loads reach beyond the yield stress of the material, therefore an elastoplastic stress-strain response is observed. Prandtl operator approach, implemented into the finite element analysis, is used to simulate the response of the pipe bend. The approach enables fast and accurate structural simulations using the material parameters gained from uniaxial low-cycle fatigue testing at few test temperatures. The approach considers a cyclic elastoplastic material behaviour with multilinear kinematic hardening at variable temperatures. Comparison with the commonly used Besseling model shows a comparable stress-strain path simulation, but ensures a 30 % shorter computational time. Fatigue lifetime estimation differs for 4 % at the critical control point for the analysed thermomechanical load history.

• Language: English
• Keywords: finite element method, thermomechanical loading, Prandtl operator, plasticity, fatigue, pipe bends
• Work type: Article
• Typology: 1.08 - Published Scientific Conference Contribution
• Organization: FS - Faculty of Mechanical Engineering
• Publication status: Published
• Publication version: Version of Record
• Year: 2022
• Number of pages: Str. 150-158
• Numbering: Vol. 35
• PID: 20.500.12556/RUL-134441
• UDC: 620.178.3
• ISSN on article: 2452-3216
• DOI: 10.1016/j.prostr.2021.12.059
• COBISS.SI-ID: 93442563
• Publication date in RUL: 14.01.2022

Record is a part of a proceedings

• Title: 2nd International Workshop on Plasticity, Damage and Fracture of Engineering Materials (IWPDF 2021), 18-20 August 2021, Ankara, Turkey
• COBISS.SI-ID: 93441539

Record is a part of a journal

• Title: Procedia structural integrity
• Publisher: Elsevier
• ISSN: 2452-3216
• COBISS.SI-ID: 19720726

Secondary language

• Language: Slovenian
• Keywords: metoda končnih elementov, termomehansko utrujanje, Prandtlov operator, plastičnost, utrujanje, cevna kolena

Projects

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