Life prediction and life extension of composite specimens using acoustic emission technique

Francis Nkrumah; Mannur J. Sundaresan; Leonard Uitenham

doi:10.1117/12.600193

17 May 2005 Life prediction and life extension of composite specimens using acoustic emission technique

Francis Nkrumah, Mannur J. Sundaresan, Leonard Uitenham

Proceedings Volume 5764, Smart Structures and Materials 2005: Smart Structures and Integrated Systems; (2005) https://doi.org/10.1117/12.600193
Event: SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring, 2005, San Diego, California, United States

Abstract

This paper discusses a proof test procedure for estimating and extending the fatigue life of composite coupons. The estimates were based on the acoustic emission data collected during the described proof test procedure. A group of coupon specimens that included both undamaged as well as damaged ones were tested to verify the ability to estimate the fatigue durability. For majority of the specimens tested the fatigue life of the coupons is inversely proportional to the cumulative AE energy collected during the proof test procedure. Based on the trend that was established, a new group of specimens AE based proof test was performed and using the acoustic emission response, the life was estimated. If one could estimate the fatigue life, it would be possible to identify those specimens, which are likely to fail prematurely. For such specimens it may be possible to extend the fatigue life by appropriate reduction in the cyclic load amplitude. This hypothesis was tested on the last group of specimens. The results obtained during the life extension phase actually show that it is possible to identify the specimens, which are likely to have short life and extend the fatigue life by subjecting them to less demanding load history.

Citation Download Citation

Francis Nkrumah, Mannur J. Sundaresan, and Leonard Uitenham "Life prediction and life extension of composite specimens using acoustic emission technique", Proc. SPIE 5764, Smart Structures and Materials 2005: Smart Structures and Integrated Systems, (17 May 2005); https://doi.org/10.1117/12.600193

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