<abstract xml:lang="en" xmlns="http://www.w3.org/1999/xhtml"><p>The paper presents the attempt to predict fatigue crack growth rate in a component subjected to variable amplitude loading containing overload-underload cycles. For this goal in a deterministic approach the modified Willenborg retardation model was applied. To provide experimental data the research into fatigue crack growth for 2024-T3 aluminum alloy sheet CCT specimens under LHL type block program loading with multiple overload-underload cycles was developed. The microfractographic analysis of fatigue fractures with the use of the transmission electron microscope (TEM) made it possible to trace the effect of block program loading on the crack growth rate. The knowledge of the affection of a particular overload-underload cycle or a block of these cycles on crack rate on the basis of microfractographic analysis was utilized for assessing the equivalent loading for the LHL block program. The diagrams that presented the crack growth rate both on the surface and inside the aluminum alloy sheet was performed. The crack growth rate inside the sheet was estimated on the basis of the striation spacing analysis.</p></abstract>

The paper presents the attempt to predict fatigue crack growth rate in a component subjected to variable amplitude loading containing overload-underload cycles. For this goal in a deterministic approach the modified Willenborg retardation model was applied. To provide experimental data the research into fatigue crack growth for 2024-T3 aluminum alloy sheet CCT specimens under LHL type block program loading with multiple overload-underload cycles was developed. The microfractographic analysis of fatigue fractures with the use of the transmission electron microscope (TEM) made it possible to trace the effect of block program loading on the crack growth rate. The knowledge of the affection of a particular overload-underload cycle or a block of these cycles on crack rate on the basis of microfractographic analysis was utilized for assessing the equivalent loading for the LHL block program. The diagrams that presented the crack growth rate both on the surface and inside the aluminum alloy sheet was performed. The crack growth rate inside the sheet was estimated on the basis of the striation spacing analysis.

Deterministic Approach to Predicting the Fatigue Crack Growth in the 2024-T3 Aluminum Alloy Under Variable Amplitude Loading

Military University of Technology, Warsaw, Poland

Fatigue of Aircraft Structures

The paper presents the attempt to predict fatigue crack growth rate in a component subjected to variable amplitude loading containing overload-underload...

Deterministic Approach to Predicting the Fatigue Crack Growth in the 2024-T3 Aluminum Alloy Under Variable Amplitude Loading

Published Online: Sep 23, 2010

Page range: 102 - 115

DOI: https://doi.org/10.2478/v10164-010-0010-1

Keywords
aluminum alloy, fatigue crack growth rate, microfractographic analysis, Willenborg retardation model

This content is open access.

Deterministic Approach to Predicting the Fatigue Crack Growth in the 2024-T3 Aluminum Alloy Under Variable Amplitude Loading

Published Online: Sep 23, 2010

Page range: 102 - 115

DOI: https://doi.org/10.2478/v10164-010-0010-1

Keywordsaluminum alloy, fatigue crack growth rate, microfractographic analysis, Willenborg retardation model

This content is open access.

Keywords
aluminum alloy, fatigue crack growth rate, microfractographic analysis, Willenborg retardation model