elib
DLR-Header
DLR-Logo -> http://www.dlr.de
DLR Portal Home | Imprint | Privacy Policy | Contact | Deutsch
Fontsize: [-] Text [+]

Numerical Modeling of Guided Waves in Anisotropic Composites with Application to Air-coupled Ultrasonic Inspection

Huber, Armin (2020) Numerical Modeling of Guided Waves in Anisotropic Composites with Application to Air-coupled Ultrasonic Inspection. DLR-Forschungsbericht. DLR-FB-2020-50. Dissertation. Universität Augsburg. 233 S.

[img] PDF
20MB

Abstract

This thesis is about the physics of ultrasonic guided waves in multilayered anisotropic composites. The Stiffness Matrix Method (SMM) is presented, and its implementation into the Dispersion Calculator (DC) is reported. The mode family-specific boundary conditions and characteristic functions as well as the dispersion curve tracing algorithms applied by the DC are discussed. The DC allows the calculation of guided wave dispersion diagrams and mode shapes for laminates containing several hundreds of layers with high efficiency and robustness. A new method of Lamb wave-based non-destructive inspection using an a priori calculated excitation angle map is presented. The Adaptive Slanted Reflection Mode (ASRM) allows the optimal excitation of Lamb waves in CFRP components with varying layups and curvature gradients. The robotic Adaptive End Effector (AEE) enables the in-line adaptation of the Lamb wave excitation angle during the scanning. The ASRM proves superior to the conventional non-adaptive Focused Slanted Reflection Mode (FSRM).

Item URL in elib:https://elib.dlr.de/139819/
Document Type:Monograph (DLR-Forschungsbericht, Dissertation)
Title:Numerical Modeling of Guided Waves in Anisotropic Composites with Application to Air-coupled Ultrasonic Inspection
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Huber, ArminArmin.Huber (at) dlr.dehttps://orcid.org/0000-0002-5694-8293
Date:16 December 2020
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Number of Pages:233
ISSN:1434-8454
Status:Published
Keywords:Ultrasonics, Guided waves, Lamb waves, Multilayered composites, Numerical modeling, Stiffness matrix method, Software, Dispersion Calculator, Non-destructive inspection, Adaptive End Effector, Adaptive Slanted Reflection Mode
Institution:Universität Augsburg
Department:Mathematisch-Naturwissenschaftlich-Technischen Fakultät
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:fixed-wing aircraft
DLR - Research area:Aeronautics
DLR - Program:L AR - Aircraft Research
DLR - Research theme (Project):L - Structures and Materials (old)
Location: Augsburg
Institutes and Institutions:Institute of Structures and Design > Automation and Production Technology
Deposited By: Huber, Armin
Deposited On:18 Dec 2020 10:17
Last Modified:16 Dec 2022 15:51

Repository Staff Only: item control page

Browse
Search
Help & Contact
Information
electronic library is running on EPrints 3.3.12
Website and database design: Copyright © German Aerospace Center (DLR). All rights reserved.