Publication detail
Critical length parameter of HDPE and its use in fatigue lifetime predictions
KOZÁKOVÁ, K. TRÁVNÍČEK, L. PODUŠKA, J. KLUSÁK, J.
English title
Critical length parameter of HDPE and its use in fatigue lifetime predictions
Type
journal article in Web of Science
Language
en
Original abstract
The contribution describes the fatigue lifetime predictions of polyethylene notched specimens based on the theory of critical distance. The approach uses the line method, which averages the axial stress over the critical distance. The critical distance is determined from experimental data of Cracked Round Bar (CRB) specimens and specimens with a model notch. From these two sets of experimental fatigue data and corresponding axial stress distributions, the critical distance is determined. The critical distance depends on the number of cycles to failure and notch radius. For this reason, the critical distance is modified by the ratio of stress concentration factors and the modified distance is used for fatigue lifetime predictions of notched specimens with various notch radii. Using this approach significant savings in testing time can be achieved. CRB fatigue tests are commonly used tests for ranking PE pipe grades and are easily available. Adding the fatigue tests of notched specimens with a model notch, the critical parameter can be found, and fatigue lifetime predictions of various notches can be calculated.
English abstract
The contribution describes the fatigue lifetime predictions of polyethylene notched specimens based on the theory of critical distance. The approach uses the line method, which averages the axial stress over the critical distance. The critical distance is determined from experimental data of Cracked Round Bar (CRB) specimens and specimens with a model notch. From these two sets of experimental fatigue data and corresponding axial stress distributions, the critical distance is determined. The critical distance depends on the number of cycles to failure and notch radius. For this reason, the critical distance is modified by the ratio of stress concentration factors and the modified distance is used for fatigue lifetime predictions of notched specimens with various notch radii. Using this approach significant savings in testing time can be achieved. CRB fatigue tests are commonly used tests for ranking PE pipe grades and are easily available. Adding the fatigue tests of notched specimens with a model notch, the critical parameter can be found, and fatigue lifetime predictions of various notches can be calculated.
Keywords in English
Polyethylene; theory of critical distances; notches; CRB tests; fatigue lifetime predictions
Released
12.12.2024
Publisher
GRUPPO ITALIANO FRATTURA
Location
CASSINO
ISSN
1971-8993
Volume
19
Number
January 2025
Pages from–to
211–222
Pages count
12
BIBTEX
@article{BUT193829,
author="Kamila {Kozáková} and Lukáš {Trávníček} and Jan {Poduška} and Jan {Klusák},
title="Critical length parameter of HDPE and its use in fatigue lifetime predictions",
year="2024",
volume="19",
number="January 2025",
month="December",
pages="211--222",
publisher="GRUPPO ITALIANO FRATTURA",
address="CASSINO",
issn="1971-8993"
}