The Ultrasonic Modeling Code Efit as Applied to Inhomogeneous Dissipative Isotropic and Anisotropic Media

Marklein, R.; Bärmann, R.; Langenberg, K. J.

doi:10.1007/978-1-4615-1987-4_28

Cited by 30 publications

(13 citation statements)

References 10 publications

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“…The Gauss-Hermite [7,8,9], the multi-Gaussian [10,11], and the boundary diffraction models [12,13,14] are all paraxial models. Other models have been developed that may be more detailed but also more computationally intensive than these [15,16,17,18,19,20,21]. The models describe fields generated by transducers of different shapes and fields and are calculated on the basis of external properties of the transducer (i.e.…”

Section: Theories Of Interaction With Probe Fieldsmentioning

confidence: 99%

Evolution of Qnde’s Core Interdisciplinary Science and Engineering Base

Thompson¹,

Chimenti²

2010

AIP Conference Proceedings

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Nondestructive testing (NDT) for flaws in materials and structures has undergone an evolutionary change over the past 50 years. In the U.S. it has moved from a testing strategy (NDT) with a zero defects requirement to a test and evaluate technology (NDE) based upon damage tolerant design considerations. Here it is assumed that the part will always contain defects but those greater than a critical size, specified by fracture mechanics, will be removed by inspection thereby resetting the part's service clock. In this talk, events will be identified that were critical in promoting this paradigm shift and in moving on to quantitative NDE (QNDE). A number of major research programs were also initiated to upgrade NDT to meet the new requirements; principal attention in this talk will be given to research highlights initiated in the first of these programs, the DARPA∕AFML Interdisciplinary Program for Quantitative Flaw Definition that was established 35 years ago. Its purpose was threefold: to develop a new core science∕people base for inspection technology that could meet the new requirements, to set the stage for new field-adaptable engineering tools, and to initiate the current continuing series of quantitative NDE (QNDE) meetings. Advances initiated in this program and pursued by many over the years have resulted in a scientific core structure for quantitative NDE (QNDE) based on a linkage of fundamental models of the various measurement processes that are involved in any inspection and∕or technology. These models and their linkage will be discussed and the core structure defined. A new and powerful set of engineering tools-i.e. simulation programs for UT, X-ray, and EC technologies -has also been developed using these models. Applications of these tools will be highlighted and their role in other advanced programs including Structural Health Monitoring and Condition-Based Maintenance will be noted. Finally, a discussion of visions of future opportunities and directions for QNDE will be given. Published by the American Institute of Physics. Related ArticlesInfluence of a localized defect on acoustic field correlation in a reverberant medium J. Appl. Phys. 110, 084906 (2011) Full-field imaging of nonclassical acoustic nonlinearity Appl. Phys. Lett. 91, 264102 (2007) Laser ablation of solid substrates in a water-confined environment Appl. Phys. Lett. 79, 1396Lett. 79, (2001 Estimation of lubricant thickness on a magnetic hard disk using acoustic emission Rev. Sci. Instrum. 71, 1915 (2000) A theoretical model for acoustic emission sensing process in contact/near-contact interfaces of magnetic recording system J. Appl. Phys. 85, 5609 (1999) Additional information on AIP Conf. Proc. ABSTRACT. Nondestructive testing (NDT) for flaws in materials and structures has undergone an evolutionary change over the past 50 years. In the U.S. it has moved from a testing strategy (NDT) with a zero defects requirement to a test and evaluate technology (NDE) based upon damage tolerant design considerations. Here it ...

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Section: Theories Of Interaction With Probe Fieldsmentioning

confidence: 99%

Evolution of Qnde’s Core Interdisciplinary Science and Engineering Base

Thompson¹,

Chimenti²

2010

AIP Conference Proceedings

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“…87.5 0 degree. This effect is due to the anisotropy of austenite which is already studied elsewhere [6,7]. transversely isotropic austenite with a horizontal fiber direction (m = ~).…”

Section: Transducer Modelingmentioning

confidence: 99%

“…Well known direct numerical procedures for the time domain modeling of ultrasonic waves (elastodynamic waves) are given in the references [1]- [6]. One of these, the Elastodynamic Finite Integration Technique (EFIT) [6,7], has been applied to several real-life NDT situations. A subset of six 2D EFIT simulations include the NDT of a welded high pressure vessel, ultrasonic pipeline inspection, NDT of concrete (NDT-CE) (the reader is referred to [8]), NDT of fiber reinforced laminates, NDT of fiber reinforced T-stringer, and transducer modeling.…”

Section: Introductionmentioning

confidence: 99%

Ultrasonic Modeling of Real-Life NDT Situations: Applications and Further Developments

Marklein

Langenberg

Klaholz

et al. 1996

Review of Progress in Quantitative Nondestructive Evaluation

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“…EFIT is a numerical method similar to staggered-grid finite difference techniques. The technique has been in use since the 1990s with extensive foundational work reported by authors such as Fellinger, Marklein, and Schubert, among others [19][20][21][22]. In this paper EFIT is implemented to study wave interaction with in-plane fiber waviness defects.…”

Section: Waviness Modeling Elastodynamic Finite Integration Techniquementioning

confidence: 99%

Simulation of guided wave interaction with in-plane fiber waviness

Leckey

Juarez

2017

AIP Conference Proceedings

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Abstract.Reducing the timeline for certification of composite materials and enabling the expanded use of advanced composite materials for aerospace applications are two primary goals of NASA's Advanced Composites Project (ACP). A key a technical challenge area for accomplishing these goals is the development of rapid composite inspection methods with improved defect characterization capabilities. Ongoing work at NASA Langley is focused on expanding ultrasonic simulation capabilities for composite materials. Simulation tools can be used to guide the development of optimal inspection methods. Custom code based on elastodynamic finite integration technique is currently being developed and implemented to study ultrasonic wave interaction with manufacturing defects, such as in-plane fiber waviness (marcelling). This paper describes details of validation comparisons performed to enable simulation of guided wave propagation in composites containing fiber waviness. Simulation results for guided wave interaction with in-plane fiber waviness are also discussed. The results show that the wavefield is affected by the presence of waviness on both the surface containing fiber waviness, as well as the opposite surface to the location of waviness.

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The Ultrasonic Modeling Code Efit as Applied to Inhomogeneous Dissipative Isotropic and Anisotropic Media

Cited by 30 publications

References 10 publications

Evolution of Qnde’s Core Interdisciplinary Science and Engineering Base

Evolution of Qnde’s Core Interdisciplinary Science and Engineering Base

Ultrasonic Modeling of Real-Life NDT Situations: Applications and Further Developments

Simulation of guided wave interaction with in-plane fiber waviness

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