Structural Degradation of a Tank Cannon due to Hole Damage

Structural degradation of the material upon long-term thermal and force impacts is a complex process which includes migration of the grain boundaries, diffusion of the active elements of the external and technological environment, hydrogen embrittlement, aging, grain boundary corrosion and other mechanisms. Application of the fractal and multifractal formalism to the description of microstructures opens up wide opportunities for quantitative assessment of the structural arrangement of the material, clarifies and reveals new aspects of the known mechanisms of structural transformations. Multifractal parameterization allows us to study the processes of structural degradation from the images of microstructures and identify structural changes that are hardly distinguishable visually. Any quantitative structural indicator can be used to calculate the multifractal spectra of the microstructure, but the most preferable is that provides the maximum range of variation in the numerical values of the multifractal components. The results of studying structural degradation of steel 15Kh5M upon continuous duty are presented. It is shown that structural degradation of steel during operation under high temperatures and stresses is accompanied by enlargement of the microstructural objects, broadening of the grain boundaries and allocation of the dispersed particles which are represented as point objects in the images. The processes of structural degradation lead to an increase in the range of changes in the components of the multifractal spectra. High values of complex indicators of structural arrangement indicate to an increase in heterogeneity and randomness at the micro-scale level, but at the same time, to manifestation of the ordered combinations of individual submicrostructures. Those structural transformations adapt the material to external impacts and provide the highest reliability and fracture resistance of the material.

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Structural degradation of ceramics

Biomaterials ◽

10.1016/0142-9612(84)90064-4 ◽

1984 ◽

Vol 5 (1) ◽

pp. 37-41 ◽

Cited By ~ 6

Author(s):

R.W. Davidge

Keyword(s):

Structural Degradation

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Evaluation of the structural degradation and damage of steel of steam pipelines subjected to the long-term action of thermomechanical factors

Materials Science ◽

10.1007/bf02538520 ◽

1997 ◽

Vol 33 (2) ◽

pp. 232-237

Author(s):

O. V. Vol'demarov ◽

V. Sijacki-Zeravcic ◽

I. R. Dzioba ◽

M. Radovic ◽

E. Kovacevic

Keyword(s):

Structural Degradation

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Damage model for diffusion-induced structural degradation of metal-ion battery

Journal of Energy Storage ◽

10.1016/j.est.2021.103748 ◽

2022 ◽

Vol 45 ◽

pp. 103748

Author(s):

Fuqian Yang

Keyword(s):

Metal Ion ◽

Damage Model ◽

Structural Degradation

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Testing of Acoustic Emission Technology to Detect Cracks and Corrosion in the Marine Environment

Journal of Ship Production and Design ◽

10.5957/jspd.2010.26.2.106 ◽

2010 ◽

Vol 26 (02) ◽

pp. 106-110

Author(s):

Ge Wang ◽

Michael Lee ◽

Chris Serratella ◽

Stanley Botten ◽

Sam Ternowchek ◽

...

Keyword(s):

Acoustic Emission ◽

Structural Integrity ◽

Pilot Project ◽

Development Project ◽

Management Program ◽

Pipeline System ◽

Inspection Planning ◽

Structural Degradation ◽

Integrity Management ◽

Acoustic Emission Technology

Real-time monitoring and detection of structural degradation helps in capturing the structural conditions of ships. The latest nondestructive testing (NDT) and sensor technologies will potentially be integrated into future generations of the structural integrity management program. This paper reports on a joint development project between Alaska Tanker Company, American Bureau of Shipping (ABS), and MISTRAS. The pilot project examined the viability of acoustic emission technology as a screening tool for surveys and inspection planning. Specifically, testing took place on a 32-year-old double-hull Trans Alaska Pipeline System (TAPS) trade tanker. The test demonstrated the possibility of adapting this technology in the identification of critical spots on a tanker in order to target inspections. This targeting will focus surveys and inspections on suspected areas, thus increasing efficiency of detecting structural degradation. The test has the potential to introduce new inspection procedures as the project undertakes the first commercial testing of the latest acoustic emission technology during a tanker's voyage.

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