Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5015154 | International Journal of Fatigue | 2017 | 21 Pages |
Abstract
In this paper, the 2060 Al-Li alloy specimens containing a single crack and multiple cracks were tested under fatigue load. The experimental results showed that the fatigue crack growth rates for multiple cracks deviated from the single crack when there is no interaction between multiple cracks. The results cannot be interpreted by the conventional Paris law using the crack tip stress intensity factor range ÎK calculated with the external applied nominal stress ÎÏ. At a given ÎK, the fatigue crack growth rates (da/dN) of different cracks for the same homogeneous material should be same based on the Paris law. Therefore, a new mechanical driving force parameter ÎKn that was calculated using the net section stress range ÎÏn was proposed to describe the single crack and collinear multiple cracks growth behavior under fatigue load. All da/dN vs ÎKn curves for collinear cracks of equal and unequal crack sizes were overlapped, and also overlapped with the single crack curve when no interaction occurred, showing that the ÎKn can be considered as a proper parameter to address the fatigue behavior of materials containing multi-cracks.
Related Topics
Physical Sciences and Engineering
Engineering
Mechanical Engineering
Authors
Hui Jin Jin, Su Jun Wu,