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PODUŠKA, J. HUTAŘ, P. FRANK, A. KUČERA, J. SADÍLEK, J. PINTER, G. NÁHLÍK, L.
Original Title
Numerical simulations of cracked round bar test: Effect of residual stresses and crack asymmetry
Type
journal article in Web of Science
Language
English
Original Abstract
The Cracked Round Bar (abbreviated as CRB in the following) test is used as standardized accelerated testing method for simple ranking of polyethylene pipes based on measuring number of cycles to failure of the cyclically loaded CRB specimen. It can also be used for the slow crack growth rate evaluation of the tested material. This paper deals with the issue of asymmetrically growing cracks in CRB specimens and possible influence of the asymmetry on the results of CRB tests, both the number of cycles to failure and the crack growth rates. It is assumed that the asymmetry is caused by presence of residual stress in the CRB specimens. In the first part of the paper, residual stress in two polyethylene pipes (produced using different extrusion speed) is investigated. Then CRB specimens made from these pipes are also examined regarding the residual stress and the results are compared. The found residual stress distributions are used as input for the following finite element method (FEM) simulation of crack growth in the CRB specimens. The FEM model results are then evaluated and fatigue crack growth rates for asymmetrically growing cracks are calculated. They are compared to the results for symmetrically growing cracks and influence on the results and its significance is discussed. In the end, CRB specimen lifetime prediction is carried out and the influence of the asymmetry on the obtained number of cycles to the failure is also addressed.
Keywords
Asymmetrical crack;Cracked round bar test;Fatigue crack growth rate;Polyethylene pipe;Residual stress
Authors
PODUŠKA, J.; HUTAŘ, P.; FRANK, A.; KUČERA, J.; SADÍLEK, J.; PINTER, G.; NÁHLÍK, L.
Released
13. 11. 2018
Publisher
Elsevier Ltd
ISBN
0013-7944
Periodical
Engineering Fracture Mechanics
Year of study
203
Number
2018
State
United Kingdom of Great Britain and Northern Ireland
Pages from
18
Pages to
31
Pages count
14
URL
https://www.sciencedirect.com/science/article/pii/S0013794418300997?via%3Dihub
BibTex
@article{BUT151149, author="Jan {Poduška} and Pavel {Hutař} and Andreas {Frank} and Jaroslav {Kučera} and Jiří {Sadílek} and Gerald {Pinter} and Luboš {Náhlík}", title="Numerical simulations of cracked round bar test: Effect of residual stresses and crack asymmetry", journal="Engineering Fracture Mechanics", year="2018", volume="203", number="2018", pages="18--31", doi="10.1016/j.engfracmech.2018.06.032", issn="0013-7944", url="https://www.sciencedirect.com/science/article/pii/S0013794418300997?via%3Dihub" }