By George Ferguson; et al
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Extra resources for Structural integrity and failure : selected, peer reviewed papers from the International Conference on Structural Integrity and Failure (SIF 2010), July 4-7, 2010, held at the University of Auckland, Auckland, New Zealand
Sample text
After the post-ECAP annealing, GBs partly lost broad contours and SADP showed a decrease in misorientation angle between adjacent grains. The tensile strength of annealed copper (UFGA) was about 5 % smaller than that of UFG. Correspondingly, the fatigue life at high stress amplitudes was smaller in UFGA than UFG, whereas at stress amplitudes less than 130 MPa, the fatigue life of UFGA exceeds UFG. A 20 µm length crack initiation life decreased due to the annealing. Regarding crack growth behavior, at high stress amplitudes, dl/dN vs.
5 MPa√m. 0 MPa√m. 5 MPa√m. In calculating the critical distance, Lo, the choice of threshold is one of the important factors. In this study, the R independent value for ∆Kth-eff was chosen. The conventional treatment of fatigue from notches is to use the fatigue notch factor, Kf, to account for the combined effects of the elastic stress concentration at the notch and the sensitivity of the material to notches using the method described in Lee et al [1]. The ∆σe and ∆σR90, C90 endurance limits for the notched samples are shown in Table 1, along with calculated values based on the un-notched fatigue limit.
Before the ECAP process, the materials were annealed at 500˚C for 1hr (grain size: 60 µm). The ECAP die used in the processing is shown in Fig. 1. The inner and outer angles of channel intersection were 90˚ and 45˚, respectively. Repetitive ECAP was accomplished by Bc route (after each pressing, the billet bar was rotated around its longitudinal axis through 90˚). 9 [8]. To change the non-equilibrium states of the grain boundary (GB) region, some of the ECAP processed samples were annealed at 180˚C for 3 min in an oil bath.