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The uniaxially prestrained specimens exhibited higher fatigue strength than that of the as-received ones for the long life region, but the opposite effect was observed for the short life region of less than 104 reversals.
This characteristic can be well explained by the fact that there exist several dominant failure modes including delamination damage in this life region.
Most of them could not be applied for welded structures serviced in the ultra-long life region so the new recommendations were discussed.
The failure mode under fatigue loading mainly consisted of three kinds: the fiber breakage, matrix cracking and interlaminar delamination, which clearly depends upon the stress level, in other words, fatigue life region.
The fatigue behavior of forged Ti 6Al 4V with three different microstructures were thereby characterized on the basis of multiscale fatigue crack observations on electrolytically polished hourglass specimens loaded in the finite life region.
The fretting fatigue life of Ti 4.5Al 3V 2Mo 2Fe is hardly affected by the volume fraction and diameter of the primary α phase in the low cycle fretting fatigue life region.
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As these factors are important in providing a high quality of life, regions would benefit from having a high number of potential entrepreneurs willing to act on potential gains from trade.
Furthermore, from detailed observations of crack initiation sites using a scanning electron microscope (SEM), the difference in the fatigue fracture morphology between the shorter and longer fatigue life regions was investigated and the shape of the S N diagram was discussed.
More importantly, shot peening after CC treatment resulted in considerably longer fatigue life over untreated and CC treated materials in the finite-life region.
The proposed S-N curve appears to be more accurate in describing the S-N relation in high-cycle fatigue: it presents a smooth transition from finite to infinite-life regions and, differently from previous non-linear S-N relations with fatigue limit, this transition is controlled by an independent model parameter.
Her poems are flash bulletins from her inner life, a region that she examines unsparingly.
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