Needs and opportunities: nondestructive evaluation for energy systems

Bond, Leonard J.

doi:10.1117/12.2086279

Cited by 5 publications

(4 citation statements)

References 30 publications

(28 reference statements)

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“…Many critical components in aerospace structures and energy systems are comprised of highly heterogeneous composites [1,2]. Examples include (a) single- and polycrystalline superalloys deployed in aeroengine and gas turbine blades [3], (b) interpenetrating phase metamaterials such as SiC-SiC composites used in accident-tolerant nuclear fuel claddings [4,5] and (c) multifunctional polymer matrix composites with a wide spectrum of applications thanks to their exceptional mechanical properties [6,7].…”

Section: Introductionmentioning

confidence: 99%

Ultrasonic imaging in highly heterogeneous backgrounds

Pourahmadian

Haddar

2023

Proc. R. Soc. A.

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This work formally investigates the differential evolution indicators as a tool for ultrasonic tracking of elastic transformation and fracturing in randomly heterogeneous solids. Within the framework of periodic sensing, it is assumed that the background at time t ∘ contains (i) a multiply connected set of viscoelastic, anisotropic and piecewise homogeneous inclusions, and (ii) a union of possibly disjoint fractures and pores. The support, material properties and interfacial condition of scatterers in (i) and (ii) are unknown, while elastic constants of the matrix are provided. The domain undergoes progressive variations of arbitrary chemo-mechanical origins such that its geometric configuration and elastic properties at future times are distinct. At every sensing step t ∘ , t 1 , … , multi-modal incidents are generated by a set of boundary excitations, and the resulting scattered fields are captured over the observation surface. The test data are then used to construct a sequence of wavefront densities by solving the spectral scattering equation. The incident fields affiliated with distinct pairs of obtained wavefronts are analysed over the stationary and evolving scatterers for a suit of geometric and elastic evolution scenarios entailing both interfacial and volumetric transformations. The main theorem establishes the invariance of pertinent incident fields at the loci of static fractures and inclusions between a given pair of time steps, while certifying variation of the same fields over the modified regions. These results furnish a basisfor theoretical justification of differential evolution indicators for imaging in complex composites which, in turn, enable the exclusive tomography of evolution in a background endowed with many unknown features.

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Section: Introductionmentioning

confidence: 99%

Ultrasonic imaging in highly heterogeneous backgrounds

Pourahmadian

Haddar

2023

Proc. R. Soc. A.

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show abstract

“…Many critical components in aerospace structures and energy systems are comprised of highly heterogeneous composites [41,11]. Examples include (a) single-and polycrystalline superalloys deployed in aeroengine and gas turbine blades [6], (b) interpenetrating phase metamaterials such as SiC-SiC composites used in accident-tolerant nuclear fuel claddings [1,46], and (c) multifunctional polymer matrix composites with a wide spectrum of applications thanks to their exceptional mechanical properties [25,47].…”

Section: Introductionmentioning

confidence: 99%

Ultrasonic imaging in highly heterogeneous backgrounds

Pourahmadian,

Haddar

2022

Preprint

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This work formally investigates the differential evolution indicators as a tool for ultrasonic tracking of elastic transformation and fracturing in randomly heterogeneous solids. Within the framework of periodic sensing, it is assumed that the background at time t • contains (i) a multiply connected set of viscoelastic, anisotropic, and piece-wise homogeneous inclusions, and (ii) a union of possibly disjoint fractures and pores. The support, material properties, and interfacial condition of scatterers in (i) and (ii) are unknown, while elastic constants of the matrix are provided. The domain undergoes progressive variations of arbitrary chemomechanical origins such that its geometric configuration and elastic properties at future times are distinct. At every sensing step t • , t 1 , . . ., multi-modal incidents are generated by a set of boundary excitations, and the resulting scattered fields are captured over the observation surface. The test data are then used to construct a sequence of wavefront densities by solving the spectral scattering equation. The incident fields affiliated with distinct pairs of obtained wavefronts are analyzed over the stationary and evolving scatterers for a suit of geometric and elastic evolution scenarios entailing both interfacial and volumetric transformations. The main theorem establishes the invariance of pertinent incident fields at the loci of static fractures and inclusions between a given pair of time steps, while certifying variation of the same fields over the modified regions. These results furnish a basis for theoretical justification of differential evolution indicators for imaging in complex composites which, in turn, enable the exclusive tomography of evolution in a background endowed with many unknown features.

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“…At present, to identify the damage, there are two approaches that can be used. The first approach is to use the local damage identification techniques such as ultrasonic testing, eddy current, radiography, thermography, and shearography [9,10]. This local damage identification can be efficiently applied for small-to medium-sized structures [11].…”

Section: Introductionmentioning

confidence: 99%

Vibration-based damage identification for ship sandwich plate using finite element method

et al. 2020

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The sandwich plate can be used to replace the conventional steel stiffened plates on the ship’s hull structure. By using the sandwich plate, not only the stiffness of the plate can be increased but also the overall ship weight can be reduced, as well as the ship payload can be increased. The sandwich plate should be accompanied by the damage identification system to prevent ship structural failure. In this paper, the global damage identification method, which is based on the vibration analysis, is investigated. For that purpose, the vibration-based damage identification using the Finite Element Method (FEM) is explored. The variables being investigated are the damage sizes, damage locations, and the boundary conditions which affect the natural frequencies of the structures. The sandwich plate considered in this study consisted of steel faceplates with the polyurethane elastomer core, which has been checked to meet Lloyd’s register, an international maritime standard. From the analysis, it is found that the fully clamped boundary conditions accompanied by high vibration modes are more sensitive to the presence of artificial damage. The changes in the natural frequencies can be used as a reference to identify the size and location of damage in the sandwich plate.

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Needs and opportunities: nondestructive evaluation for energy systems

Cited by 5 publications

References 30 publications

Ultrasonic imaging in highly heterogeneous backgrounds

Ultrasonic imaging in highly heterogeneous backgrounds

Ultrasonic imaging in highly heterogeneous backgrounds

Vibration-based damage identification for ship sandwich plate using finite element method

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