Development of damage-tolerant and fracture-resistant materials by utilizing the material inhomogeneity effect

[+] Author and Article Information
Otmar Kolednik

Austrian Academy of Sciences Jahnstrasse 12 Leoben, A-8700 Austria otmar.kolednik@oeaw.ac.at

Roland Kasberger

Jahnstrasse 12 Leoben, A-8700 Austria Roland.Kasberger@bohler-edelstahl.at

Masoud Sistaninia

Roseggerstrasse 12 Leoben, 8700 Austria masoudsi@yahoo.com

Jozef Predan

Smetanova 17 Maribor, SI-2000 Slovenia jozef.predan@um.si

Marko Kegl

Smetanova 17 Maribor, SI-2000 Slovenia marko.kegl@um.si

1Corresponding author.

Contributed by the Applied Mechanics Division of ASME for publication in the Journal of Applied Mechanics. Manuscript received March 29, 2019; final manuscript received May 15, 2019; published online xx xx, xxxx. Assoc. Editor: Francois Barthelat.

ASME doi:10.1115/1.4043829 History: Received March 29, 2019; Accepted May 15, 2019


The improvement of fracture strength by insertion of thin, soft interlayers is a strategy observed in biological materials, such as deep-see sponges. The basic mechanism is a reduction of the crack driving force due to the spatial variation of yield strength and/or Young's modulus. The application of this “material inhomogeneity effect” is demonstrated in this paper. The effectiveness of various interlayer configurations is investigated by numerical simulations under application of the configurational force concept. Laminated composites, made of high-strength tool steels as matrix materials and a low-strength deep drawing steel as interlayer material, were manufactured by hot press bonding. The number of interlayers and the interlayer thickness were varied. Fracture mechanics experiments show crack arrest in the first interlayer and significant improvements in fracture toughness, even without the occurrence of other toughening mechanisms, such as interface delamination. The application of the material inhomogeneity effect for different types of matrix materials is discussed.

Copyright © 2019 by ASME
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