| Autor: |
Button, Lloyd, Codrington, John, Simcock, Trent, Brooks, Chris, Rajic, Nik |
| Předmět: |
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| Zdroj: |
EA National Conference Publications; 2023, p401-406, 6p |
| Abstrakt: |
This paper investigates the determination of crack tip locations within complex stress fields, namely within fastened aircraft joints, using thermoelastic stress analysis. Samples were designed using best-practice structural methodology to represent a two-row aircraft joint with minimal secondary bending such that through-thickness cracks were dominant. This was achieved with a double-lap configuration which also utilised an extra-thick centre sheet to ensure cracks form in the outer (visible) sheets. Testing was conducted under constant amplitude cyclic loading. The samples were divided into two treatment groups: a dry (untreated) group, and a group with corrosion treatments applied (CorrosionX Aviation). Crack tip locations were identified from the captured images of the thermal response fields. The crack tip finding algorithm used the location of the maximum spatial gradient of the thermal field in the direction of crack growth. Resultant crack growth rates were further verified using quantitative fractography. The results obtained from this study are now being used to develop a method to evaluate the stress intensity factor and therefore characterise the severity of the crack within a complex stress field environment. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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