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Ultrasonic measurement of crack opening load for life-extending control of mechanical structures
This paper develops and validates a technique for real-time measurement of crack tip opening load using ultrasonic sensors and its application to life-extending control of mechanical structures. To experimentally validate the proposed measurement technique, fatigue tests have been conducted in the l...
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Main Authors: | , , , , |
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Format: | Conference Proceeding |
Language: | English |
Subjects: | |
Online Access: | Request full text |
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Summary: | This paper develops and validates a technique for real-time measurement of crack tip opening load using ultrasonic sensors and its application to life-extending control of mechanical structures. To experimentally validate the proposed measurement technique, fatigue tests have been conducted in the laboratory environment on center-notched 7075-T6 aluminium alloy specimens. The energy of reflected ultrasonic waves is used to detect crack closure and opening phenomena that lead to real-time measurement of crack opening load. Experimental results are compared with the Newman's crack opening stress model under constant amplitude cyclic loading. A life-extending control scheme is proposed by taking advantage of the real-time information on fatigue damage in mechanical structures. |
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ISSN: | 0743-1619 2378-5861 |
DOI: | 10.1109/ACC.2009.5160021 |