Fatigue crack growth and stress redistribution at interfaces |
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| Affiliation: | 1. Politecnico di BARI, Center of Excellence in Computational Mechanics, Viale Gentile 182, Bari 70126, Italy;2. Department of Mechanical Engineering, Hamburg University of Technology, Am Schwarzenberg-Campus 1, Hamburg 21073, Germany;1. Faculty of Materials Science and Engineering, Kunming University of Science and Technology, Kunming 650093, China;2. Yunnan Academy of Science and Technology, Kunming 650051, China |
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| Abstract: | The role of the interface in redistributing stress around cracks in multilayered ceramic/metal composites is investigated. The emphasis is on the different effects of interfacial debonding or of plastic slip in the metal phase adjacent to strongly bonded interfaces. The experiments are conducted on alumina/aluminum multilayered composites. Monotonic loading precracked test pieces causes plastic shear deformation within the aluminum layer at the tip of the notch without debonding. However, interfacial debonding can be induced by cyclic loading, in accordance with a classical fatigue mechanism. Measurements of the stress around the crack demonstrate that debonding is much more effective than slip at reducing the stress ahead of the crack. |
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