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Numerical model of plastic deformation of crack surface under repeated aerodynamic impact

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Document pages: 9 pages

Abstract: Crack closure by repeated impact is considered to be an effective and economic method, which can prolong the fatigue residual life of the structure affected by fatigue and have less damage. In order to describe the crack closure effect, the plastic behavior of material under repeated impact of chisel and material body was studied. The mathematical model between impact depth, impact times and device parameters is established and verified by experiments. The material properties after repeated impact are determined by metallographic analysis and microhardness test. It shows that due to the grain refinement caused by repeated impact, the material will harden in a small influence area. The finite element method is used as a supplementproach, to investigate the relationship between impact depth and horizontal deformation on the cracked surface. A one-to-one linear relation was obtained, even under the different chisel tip parameters. Therefore, the contact of fracture surface, i.e. crack closure, can be predicted with the help of this numerical model and the aforementioned relationship.

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