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What is going to be covered. Fatigue investigation of Al7010 Crack Initiation Crack Propagation Rupture.
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Composition of examined alloy (Al7010) [1]. Element Zn Mg Cu Zr Fe Si Ti %Weight 6.07 2.43 1.60 0.103 0.098 0.079 0.028.
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. . uAOL•;. . Crack Start-up Locations. T he locations where the brittle particles are intragranular is known as “hazardous zones”. (Mostly crack initiation begins).
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Although the fractures might diverge locally depending on the microstructure they come across, they stay in mode 1: [1]..
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During the fatigue life of the same sample several cracks can be initiated..
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Table 2. Mechanical properties of Alloys. Fatigue Strength.
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Results of training. An improvement in the fatigue life at all stress levels A significant increase in the fatigue life of AA2024 at the load of 200MPa 25 times rise in the lifetime of trained AA7050 The trained material can be capable of acquiring the fatigue strength approximately ½ of its tensile strength The greatest increase for the stronger materials due to the larger strength difference between the original PFZ’s and the grain interior.
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