About the role of interfaces on the fatigue crack propagation in laminated metallic composites

Pohl P, Kümmel F, Schunk C, Serrano-Munoz I, Markötter H, Göken M, Höppel HW (2021)

Publication Type: Journal article

Publication year: 2021

Journal

Materials MDPI

Book Volume: 14

Article Number: 2564

Journal Issue: 10

DOI: 10.3390/ma14102564

Abstract

The influence of gradients in hardness and elastic properties at interfaces of dissimilar materials in laminated metallic composites (LMCs) on fatigue crack propagation is investigated ex-perimentally for three different LMC systems: Al/Al-LMCs with dissimilar yield stress and Al/Steel-LMCs as well as Al/Ti/Steel-LMCs with dissimilar yield stress and Young’s modulus, respectively. The damage tolerant fatigue behavior in Al/Al-LMCs with an alternating layer structure is enhanced significantly compared to constituent monolithic materials. The prevalent toughening mechanisms at the interfaces are identified by microscopical methods and synchrotron X-ray computed tomography. For the soft/hard transition, crack deflection mechanisms at the vicinity of the interface are observed, whereas crack bifurcation mechanisms can be seen for the hard/soft transition. The crack propagation in Al/Steel-LMCs was studied conducting in-situ scanning electron microscope (SEM) experiments in the respective low cycle fatigue (LCF) and high cycle fatigue (HCF) regimes of the laminate. The enhanced resistance against crack propagation in the LCF regime is attributed to the prevalent stress redistribution, crack deflection, and crack bridging mechanisms. The fatigue properties of different Al/Ti/Steel-LMC systems show the potential of LMCs in terms of an appropriate selection of constituents in combination with an optimized architecture. The results are also dis-cussed under the aspect of tailored lightweight applications subjected to cyclic loading.

Authors with CRIS profile

Philip Pohl Lehrstuhl für Werkstoffwissenschaften (Allgemeine Werkstoffeigenschaften) Frank Kümmel Lehrstuhl für Werkstoffwissenschaften (Allgemeine Werkstoffeigenschaften) Christopher Schunk Lehrstuhl für Werkstoffwissenschaften (Allgemeine Werkstoffeigenschaften) Mathias Göken Lehrstuhl für Werkstoffwissenschaften (Allgemeine Werkstoffeigenschaften) Heinz Werner Höppel Lehrstuhl für Werkstoffwissenschaften (Allgemeine Werkstoffeigenschaften)

Related research project(s)

Center for Nanoanalysis and Electron Microscopy (CENEM) Jan. 1, 2010 - March 3, 2038 Mechanical properties and fracture behavior of thin layers (GRK1896-B3) In-situ Characterization of Nanomaterials with Electrons, X-rays/Neutrons and Scanning Probes (GRK 1896) Oct. 1, 2013 - Sept. 30, 2022

Involved external institutions

Bundesanstalt für Materialforschung und -prüfung (BAM) DE Germany (DE)

How to cite

APA:

Pohl, P., Kümmel, F., Schunk, C., Serrano-Munoz, I., Markötter, H., Göken, M., & Höppel, H.W. (2021). About the role of interfaces on the fatigue crack propagation in laminated metallic composites. Materials, 14(10). https://dx.doi.org/10.3390/ma14102564

MLA:

Pohl, Philip, et al. "About the role of interfaces on the fatigue crack propagation in laminated metallic composites." Materials 14.10 (2021).

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