Ultrasonic guided wave-based inspection of additively manufactured components (Record no. 433136)
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| 000 -LEADER | |
|---|---|
| fixed length control field | 04548nam a2200337 4500 |
| 008 - FIXED-LENGTH DATA ELEMENTS--GENERAL INFORMATION | |
| fixed length control field | 250219b |||||||| |||| 00| 0 eng d |
| 041 ## - LANGUAGE CODE | |
| Language code of text/sound track or separate title | en |
| 082 ## - DEWEY DECIMAL CLASSIFICATION NUMBER | |
| Classification number | 621.988 |
| Item number | DUB |
| 100 ## - MAIN ENTRY--PERSONAL NAME | |
| Personal name | Dube, Anoop Kumar |
| 245 ## - TITLE STATEMENT | |
| Title | Ultrasonic guided wave-based inspection of additively manufactured components |
| 260 ## - PUBLICATION, DISTRIBUTION, ETC. (IMPRINT) | |
| Place of publication, distribution, etc | Bangalore : |
| Name of publisher, distributor, etc | Indian Institute of Science, |
| Date of publication, distribution, etc | 2025. |
| 300 ## - PHYSICAL DESCRIPTION | |
| Extent | xxxviii, 338 p. : |
| Other physical details | col. ill. |
| Accompanying material | e-Thesis |
| Size of unit | 132.2 Mb |
| 500 ## - GENERAL NOTE | |
| General note | Includes bibliographical references |
| 502 ## - DISSERTATION NOTE | |
| Dissertation note | PhD;2025;Aerospace Engineering<br/> |
| 520 ## - SUMMARY, ETC. | |
| Summary, etc | Layered structural components, such as laminated composites and those made via Additive Manufacturing (AM), are widely used in aerospace and automotive industries due to their various advantages. The layer-wise approach allows for intricate and multifunctional designs, but their performance depends on factors such as joining technique, material properties, manufacturing conditions, and service environments. These layered components are susceptible to defects like delamination, debonding, porosity, residual stress, cracks, and surface roughness, affecting mechanical performance. In AM, process parameters like laser power, scan speed, layer thickness, hatch spacing, scan strategies, solidification strategies, and build chamber conditions impact the quality of the produced parts. Optimizing these parameters and using in-process monitoring systems can minimize these defects. This thesis focuses on developing an ultrasonics-based monitoring system for AM processes. This work involves the modeling and analysis of wave propagation in multi-layered structures. For this purpose, three different approaches based on the modeling of interlayer interface bonding have been formulated. The developed models allow for the analysis of different levels of interface bonding, including perfect bonding and complete debonding. The AM components are idealized as one-dimensional higher-order planar frame structures. The equations of motion are derived from Hamilton's principle, and the Fourier transform-based Spectral Finite Element Method (FSFEM) is used to perform the spectral analysis and the spectral elements formulation. The FSFEM formulation results in the dispersion curves and responses in frequency domain, which is transformed into the time domain by performing the inverse Fast Fourier Transform. A concept of effective thickness is introduced to match the cut-off frequencies in the dispersion curves obtained from the developed approaches with those of exact Lamb waves, which are used in determining the shear correction factors necessary for higher-order frame formulations. The developed models undergo two levels of validation involving the validation of the dispersion curves, and time-domain responses. Reference dispersion curves are computed from open-source software for dispersion curve computation, while the reference time-domain responses are obtained from experiments and the Finite Element simulations. Further, this thesis focuses on examining the interaction of ultrasonic-guided waves (UGW) with two types of defects - porosity and delamination/debonding. The impact of porosity is analyzed through porosity-dependent constitutive models. Various levels of delamination/debonding are numerically simulated by varying the interface bonding strength in the defect region. Additionally, the Semi-analytical Finite Element Method is employed to perform spectral analysis of defective structural waveguides with complex geometry, where the impact of various defect parameters, such as size, depth, and orientation, have been investigated. Further, the developed FSFEM models are employed to solve inverse problems for material property characterization, porosity estimation, and interface bonding strength characterization. Ultimately, these models provide a framework for analyzing the dynamic behavior of multi-layered structures, offering insights into the interaction of UGW with defects. |
| 650 ## - SUBJECT ADDED ENTRY--TOPICAL TERM | |
| Topical term or geographic name as entry element | Guided waves |
| 650 ## - SUBJECT ADDED ENTRY--TOPICAL TERM | |
| Topical term or geographic name as entry element | Higher-order frame structures |
| 650 ## - SUBJECT ADDED ENTRY--TOPICAL TERM | |
| Topical term or geographic name as entry element | Multi-layered structural waveguides |
| 650 ## - SUBJECT ADDED ENTRY--TOPICAL TERM | |
| Topical term or geographic name as entry element | Non-destructive evaluation |
| 650 ## - SUBJECT ADDED ENTRY--TOPICAL TERM | |
| Topical term or geographic name as entry element | Spectral finite element method |
| 650 ## - SUBJECT ADDED ENTRY--TOPICAL TERM | |
| Topical term or geographic name as entry element | Structural health monitoring |
| 650 ## - SUBJECT ADDED ENTRY--TOPICAL TERM | |
| Topical term or geographic name as entry element | Wave propagation |
| 650 ## - SUBJECT ADDED ENTRY--TOPICAL TERM | |
| Topical term or geographic name as entry element | Inverse problems |
| 650 ## - SUBJECT ADDED ENTRY--TOPICAL TERM | |
| Topical term or geographic name as entry element | Additive Manufacturing |
| 650 ## - SUBJECT ADDED ENTRY--TOPICAL TERM | |
| Topical term or geographic name as entry element | Laminated composites |
| 650 ## - SUBJECT ADDED ENTRY--TOPICAL TERM | |
| Topical term or geographic name as entry element | Ultrasonics |
| 650 ## - SUBJECT ADDED ENTRY--TOPICAL TERM | |
| Topical term or geographic name as entry element | Ultrasonic-guided waves |
| 700 ## - ADDED ENTRY--PERSONAL NAME | |
| Personal name | Advised by Gopalakrishnan, S |
| 856 ## - ELECTRONIC LOCATION AND ACCESS | |
| Uniform Resource Identifier | https://etd.iisc.ac.in/handle/2005/6805 |
| 942 ## - ADDED ENTRY ELEMENTS (KOHA) | |
| Koha item type | Thesis |
No items available.
