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DTIC ADA559012: Vacuum Levels Needed to Simulate Internal Fatigue C... |
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by Defense Technical Information Center |
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Prior studies have examined fatigue growth of surface |
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cracks in vacuum to simulate sub-surface growth in Ti- |
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alloys and Ni-base superalloys. Even with the highest |
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vacuum level attained using state-of-the-artpumps, it is |
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unclear if conditions of internal crack growth are truly |
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simulated. We consider thermodynamics of the oxidation |
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process to help answer this question. This consideration |
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helps explain a previously reported anomalous behavior of |
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longer life in air than in vacuum under certain material/ |
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test conditions |
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Date Published: 2018-09-01 06:55:28 |
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Identifier: DTIC_ADA559012 |
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Item Size: 11955229 |
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Language: english |
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Media Type: texts |
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# Topics |
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DTIC Archive; ; AIR FORCE RESEARCH LA... |
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# Uploaded by |
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@chris85 |
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