Effects of Mission Overloads on Fatigue Crack Growth in Ti-6Al-2Sn-4Zr-2Mo
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| Language: | English |
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University of Dayton / OhioLINK
2018
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| Online Access: | http://rave.ohiolink.edu/etdc/view?acc_num=dayton1532083676103601 |
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ndltd-OhioLink-oai-etd.ohiolink.edu-dayton15320836761036012021-08-03T07:07:43Z Effects of Mission Overloads on Fatigue Crack Growth in Ti-6Al-2Sn-4Zr-2Mo Solomon, Daniel Maurice Materials Science Aerospace Materials Engineering Fatigue Crack Growth Variable Amplitude Loading Mission Loading Ti-6242 Compact Tension Aircraft turbine engines, especially military engines, experience variable amplitude loading (mission loading) during operation. Predicting the impact of overloads in turbine engines is key in interpreting fatigue damage and assessing the reliable lifetime of components. The objective of this study was to understand the effects of single and repeated overloads during fatigue crack growth in Ti-6Al-2Sn-4Zr-2Mo used in aircraft turbine engine rotor components.Experiments were conducted using compact tension specimens in a servo-hydraulic testing machine to measure the fatigue crack growth rates during the application of single overloads under stress intensity factor and load control. Additional experiments were conducted having, variable amplitude loading consisting of a controlled number of constant amplitude baseline cycles between periodic overloads.Single overload experiments revealed crack growth acceleration and not the classic retardation typically expected. Repeated overloads experiments demonstrated that Miner’s rule accurately predicted realistic overload behavior. Overall, the crack growth rates during single overload or repeated overloads resulted in consistent behavior, and significant crack growth retardation was not observed throughout testing in this material. In addition, crack growth rates were similar for overload and underload block fatigue conditions. The understanding of this behavior and the impact on aircraft turbine engine life tracking using Total Accumulated Cycles (TACs) was discussed. It appeared that minor cycles were generally more damaging than currently accounted for in military turbine engine life tracking. 2018-08-20 English text University of Dayton / OhioLINK http://rave.ohiolink.edu/etdc/view?acc_num=dayton1532083676103601 http://rave.ohiolink.edu/etdc/view?acc_num=dayton1532083676103601 unrestricted This thesis or dissertation is protected by copyright: all rights reserved. It may not be copied or redistributed beyond the terms of applicable copyright laws. |
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NDLTD |
| language |
English |
| sources |
NDLTD |
| topic |
Materials Science Aerospace Materials Engineering Fatigue Crack Growth Variable Amplitude Loading Mission Loading Ti-6242 Compact Tension |
| spellingShingle |
Materials Science Aerospace Materials Engineering Fatigue Crack Growth Variable Amplitude Loading Mission Loading Ti-6242 Compact Tension Solomon, Daniel Maurice Effects of Mission Overloads on Fatigue Crack Growth in Ti-6Al-2Sn-4Zr-2Mo |
| author |
Solomon, Daniel Maurice |
| author_facet |
Solomon, Daniel Maurice |
| author_sort |
Solomon, Daniel Maurice |
| title |
Effects of Mission Overloads on Fatigue Crack Growth in Ti-6Al-2Sn-4Zr-2Mo |
| title_short |
Effects of Mission Overloads on Fatigue Crack Growth in Ti-6Al-2Sn-4Zr-2Mo |
| title_full |
Effects of Mission Overloads on Fatigue Crack Growth in Ti-6Al-2Sn-4Zr-2Mo |
| title_fullStr |
Effects of Mission Overloads on Fatigue Crack Growth in Ti-6Al-2Sn-4Zr-2Mo |
| title_full_unstemmed |
Effects of Mission Overloads on Fatigue Crack Growth in Ti-6Al-2Sn-4Zr-2Mo |
| title_sort |
effects of mission overloads on fatigue crack growth in ti-6al-2sn-4zr-2mo |
| publisher |
University of Dayton / OhioLINK |
| publishDate |
2018 |
| url |
http://rave.ohiolink.edu/etdc/view?acc_num=dayton1532083676103601 |
| work_keys_str_mv |
AT solomondanielmaurice effectsofmissionoverloadsonfatiguecrackgrowthinti6al2sn4zr2mo |
| _version_ |
1719454329087197184 |