Al-Li alloy AA2198's very high cycle fatigue crack initiation mechanism and its fatigue thermal effect

Luopeng Xu; Xiaojian Cao; Yu Chen; Qingyuan Wang

doi:10.1117/12.2202283

8 October 2015 Al-Li alloy AA2198's very high cycle fatigue crack initiation mechanism and its fatigue thermal effect

Luopeng Xu, Xiaojian Cao, Yu Chen, Qingyuan Wang

Proceedings Volume 9677, AOPC 2015: Optical Test, Measurement, and Equipment; 967724 (2015) https://doi.org/10.1117/12.2202283
Event: Applied Optics and Photonics China (AOPC2015), 2015, Beijing, China

Abstract

AA2198 alloy is one of the third generation Al-Li alloys which have low density, high elastic modulus, high specific strength and specific stiffness. Compared With the previous two generation Al-Li alloys, the third generation alloys have much improved in alloys strength, corrosion resistance and weldable characteristic. For these advantages, the third generation Al-Li alloys are used as aircraft structures, such as C919 aviation airplane manufactured by China and Russia next generation aviation airplane--MS-21. As we know, the aircraft structures are usually subjected to more than 10⁸ cycles fatigue life during 20-30 years of service, however, there is few reported paper about the third generation Al-Li alloys’ very high cycle fatigue(VHCF) which is more than 10⁸ cycles fatigue. The VHCF experiment of AA2198 have been carried out. The two different initiation mechanisms of fatigue fracture have been found in VHCF. The cracks can initiate from the interior of the testing material with lower stress amplitude and more than 10⁸ cycles fatigue life, or from the surface or subsurface of material which is the dominant reason of fatigue failures. During the experiment, the infrared technology is used to monitor the VHCF thermal effect. With the increase of the stress, the temperature of sample is also rising up, increasing about 15 °C for every 10Mpa. The theoretical thermal analysis is also carried out.

Citation Download Citation

Luopeng Xu, Xiaojian Cao, Yu Chen, and Qingyuan Wang "Al-Li alloy AA2198's very high cycle fatigue crack initiation mechanism and its fatigue thermal effect", Proc. SPIE 9677, AOPC 2015: Optical Test, Measurement, and Equipment, 967724 (8 October 2015); https://doi.org/10.1117/12.2202283

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KEYWORDS

Thermal effects

Aircraft structures

Infrared technology

Ultrasonics

Infrared radiation

Eye

Scanning electron microscopy

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