Generating Tap Test Images With a Free-Hand Motorized Tapper

Barnard, Daniel J.; Foreman, Cory; Hsu, David K.

doi:10.1063/1.3114160

Cited by 2 publications

(1 citation statement)

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“…3. In other work [5], a motorized tapper was developed to enable increased speed in tap test imaging, capable of tapping in the range of 15-40 taps per second, Fig. 4a.…”

Section: Current Work -Hysteresis Measurementmentioning

confidence: 99%

Development of a Portable Mechanical Hysteresis Measurement and Imaging System for Impact Characterization in Honeycomb Sandwich Structures

Barnard

Hsu

2011

AIP Conference Proceedings

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Honeycomb sandwich materials are commonly used for aero-structures, but because the outer skins are typically thin, 2-10 plys, the structures are susceptible to impact damage. NDI methods such as tap tests, bond testers and TTU ultrasound are successfully deployed to find impact damage, but identifying the type∕degree of damage is troublesome. As the type∕degree of impact damage guides decisions by the maintenance, repair and overhaul (MRO) community regarding repair, the ability to characterize impacts is of interest. Previous work demonstrated that additional impact characterization may be gleaned from hysteresis loop area, as determined from an out-of-plane load-vs-displacement plot, where this parameter shows a correlation with impact energy. This presentation reports on current work involving the development of a portable hysteresis measurement and imaging system based on an instrumented tapper. Data processing and analysis methods that allow production of the load∕displacement data from a single accelerometer are discussed, with additional reporting of tests of software to automatically vary pixel size during scanning to decrease C-scans inspection time. Related ArticlesProbing of laser-induced crack closure by pulsed laser-generated acoustic waves J. Appl. Phys. 113, 014906 (2013) Quantitative evaluation of hidden defects in cast iron components using ultrasound activated lock-in vibrothermography Rev. Sci. Instrum. 83, 094902 (2012) Quantitative trap and long range transportation of micro-particles by using phase controllable acoustic wave J. Appl. Phys ABSTRACT. Honeycomb sandwich materials are commonly used for aero-structures, but because the outer skins are typically thin, 2-10 plys, the structures are susceptible to impact damage. NDI methods such as tap tests, bond testers and TTU ultrasound are successfully deployed to find impact damage, but identifying the type/degree of damage is troublesome. As the type/ degree of impact damage guides decisions by the maintenance, repair and overhaul (MRO) community regarding repair, the ability to characterize impacts is of interest. Previous work demonstrated that additional impact characterization may be gleaned from hysteresis loop area, as determined from an out-of-plane load-vs-displacement plot, where this parameter shows a correlation with impact energy. This presentation reports on current work involving the development of a portable hysteresis measurement and imaging system based on an instrumented tapper. Data processing and analysis methods that allow production of the load/displacement data from a single accelerometer are discussed, with additional reporting of tests of software to automatically vary pixel size during scanning to decrease C-scans inspection time.

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“…3. In other work [5], a motorized tapper was developed to enable increased speed in tap test imaging, capable of tapping in the range of 15-40 taps per second, Fig. 4a.…”

Section: Current Work -Hysteresis Measurementmentioning

confidence: 99%