Simulating UT measurements from bolthole cracks

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Gray, Timothy
Roberts, Ronald
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Grandin, Robert
Research Computing Systems Analyst
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Aerospace Engineering

The Department of Aerospace Engineering seeks to instruct the design, analysis, testing, and operation of vehicles which operate in air, water, or space, including studies of aerodynamics, structure mechanics, propulsion, and the like.

The Department of Aerospace Engineering was organized as the Department of Aeronautical Engineering in 1942. Its name was changed to the Department of Aerospace Engineering in 1961. In 1990, the department absorbed the Department of Engineering Science and Mechanics and became the Department of Aerospace Engineering and Engineering Mechanics. In 2003 the name was changed back to the Department of Aerospace Engineering.

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  • Department of Aerospace Engineering and Engineering Mechanics (1990-2003)

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Center for Nondestructive Evaluation

The Center for Nondestructive Evaluation at Iowa State has been involved in the use of nondestructive evaluation testing (NDT) technologies to: assess the integrity of a substance, material or structure; assess the criticality of any flaws, and to predict the object’s remaining serviceability. NDT technologies used include ultrasonics and acoustic emissions, electromagnetic technologies, computer tomography, thermal imaging, and others.

In October of 1985 the CNDE was approved by the State Board of Regents after it had received a grant from the National Science Foundation (NSF) as an Industry/University Cooperative Research Center.

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Analytical computer models of UT measurements are becoming more prominent in evaluating NDEmethods – a process known as Model Assisted Probability of Detection, or MAPOD. As inspection requirements become more stringent, the respective models become more complex. An important application for aerospace structures involves inspection for cracks near boltholes in plate and layered structures. This paper describes a project to develop and validate analytical models for bolthole crackinspection, as well as to implement and demonstrate those models within an integrated graphical interface which can be used to simulate these inspections. The work involves a combination of approximate, paraxial, bulk-wave models as well as more rigorous, analytical models that include both bulk and surface/plate modes. The simpler models have greater flexibility and efficiency for handling complex geometry, while the more exact models are useful for benchmarking and assessing the accuracy of the paraxial versions. Model results will be presented for bolthole cracks in single layered components. Extensions of the models to multiple layers and to more complex geometries and materials will also be discussed.


The following article appeared in AIP Conference Proceedings 1706 (2016): 050004 and may be found at doi: 10.1063/1.4940503.

Fri Jan 01 00:00:00 UTC 2016