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Toughening Mechanisms and Enhanced Damage Tolerant Fatigue Behaviour in Laminated Metal Composites

In the present study, fatigue crack growth (FCG) in a laminated metal composite (LMC) consisting of Al-based constituents with dissimilar strength was studied. Additionally, the FCG in both monolithic constituent materials was determined and a linear elastic rule of mixture (ROM) concept was calculated as a reference for the FCG of the laminated composite. Crack networks in the laminates were analyzed post-mortem by means of light microscopy and synchrotron X-Ray tomography (SXCT). Significantly reduced FCG rates for the LMC were found at elevated stress intensity ranges compared to both the monolithic constituents as well as the ROM concept. …

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In the present study, fatigue crack growth (FCG) in a laminated metal composite (LMC) consisting of Al-based constituents with dissimilar strength was studied. Additionally, the FCG in both monolithic constituent materials was determined and a linear elastic rule of mixture (ROM) concept was calculated as a reference for the FCG of the laminated composite. Crack networks in the laminates were analyzed post-mortem by means of light microscopy and synchrotron X-Ray tomography (SXCT). Significantly reduced FCG rates for the LMC were found at elevated stress intensity ranges compared to both the monolithic constituents as well as the ROM concept. This is the result of the formation of a complex 3D crack network in the laminated architecture caused by the appearance of the two different toughening mechanisms a) crack deflection and b) crack bifurcation at the vicinity of the interfaces.

Reference
LCF9-2022-035

Title
Toughening Mechanisms and Enhanced Damage Tolerant Fatigue Behaviour in Laminated Metal Composites
Author(s)
P. M. Pohl, I. Serrano-Munoz, H. Markötter, M. Göken, H. W. Höppel
DOI
10.48447/LCF9-2022-035
Event
LCF9 - Ninth International Conference on Low Cycle Fatigue
Year of publication
2022
Publication type
conference paper (PDF)
Language
English
Keywords
laminated metal composite, damage tolerance, fatigue crack growth, toughening mechanism, synchrotron X-ray computed tomography