Dr. Marcias J. Martinez Profile

Dr. Marcias J. Martinez

Association Editor at Clarkson Univ

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Publications (4)

Proceedings Article | 18 April 2023 Presentation + Paper

Ultrasonic inspection of thin composite laminates

Todd Mull, Jared Taylor, David Forsyth, Marcias Martinez

Proceedings Volume 12487, 124870J (2023) https://doi.org/10.1117/12.2657281

KEYWORDS: Composites, Simulations, Inspection, Ultrasonics, Wave propagation, Finite element methods

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Proceedings Article | 27 March 2015 Paper

MEMS inertial sensors for load monitoring of wind turbine blades

Aubryn Cooperman, Marcias Martinez

Proceedings Volume 9439, 94390A (2015) https://doi.org/10.1117/12.2082926

KEYWORDS: Sensors, Microelectromechanical systems, Filtering (signal processing), Finite element methods, Magnetic sensors, Magnetism, Beam shaping, Magnetometers, Gyroscopes, Wind turbine technology

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Proceedings Article | 9 April 2010 Paper

Damage quantification using smart patch system for hot spot monitoring

Sourav Banerjee, Shawn Beard, Fady Habib, Marcias Martinez

Proceedings Volume 7650, 76501N (2010) https://doi.org/10.1117/12.847377

KEYWORDS: Sensors, Expectation maximization algorithms, Statistical analysis, Damage detection, Structural health monitoring, Calibration, Detection and tracking algorithms, Algorithm development, Data modeling, Data analysis

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Proceedings Article | 10 April 2007 Paper

Demonstration of an instrumented patch

M. Martinez, G. Renaud, D. Backman, M. Genest, M. Delannoy

Proceedings Volume 6530, 65300M (2007) https://doi.org/10.1117/12.713930

KEYWORDS: Adhesives, Aluminum, Capacitance, Digital image correlation, Composites, Inspection, Nondestructive evaluation, Stress analysis, Thermography, Finite element methods

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The primary objective of this study was to demonstrate the effectiveness of various strain measurement techniques at detecting the disbonding of a composite repair patch and then using this information to validate a new capacitance based disbond detection technique. The instrumented repair patch was parametrically designed with the help of Finite Element Analysis (FEA) software to have a stress concentration at its tip. This stress concentration was designed to produce a disbond during fatigue testing, without the need for the introduction of any foreign material to create an artificial disbond condition. The aluminum substrate was grit blasted and the instrumented patch was bonded using FM^®73 adhesive, and was cured following the recommendations of the manufacturer. The geometric characteristics of the patch followed standard repair guidelines for such variables as material selection, taper angles and loading conditions, with the exception of the area designed for premature disbond. All test specimens were inspected using non-destructive testing technique (ultrasound pulse echo) to guarantee that no disbonding had occurred during curing of the specimen. The specimens were placed under fatigue loading to induce a disbond condition between the aluminum substrate and the patch. The specimens were cyclically loaded and strain gauges bonded to strategic locations on the aluminum and composite patch surface to be able to measure changes in surface strains as the disbond progressed. A Digital Image Correlation (DIC) system was also used to measure full field strains over the gauge length of the coupon. The DIC results were compared with the strain gauge data and were used to provide a qualitative measure of the load transfer in the bonded specimen, which clearly demonstrated the change in surface strain that occurred as the composite patch disbonded from the aluminum substrate. Thermoelastic Stress Analysis (TSA) was also used to measure surface strains on the composite patch. Thermoelastic stress analysis proved to be the most sensitive technique for experimentally monitoring the disbond process in real time. Failure analysis of the specimens using optical microscope techniques was performed to determine the type of failure between the patch and the substrate. The results of this work will serve to test the different types of sensors available for the design and manufacturing of a "Smart Patch" for aircraft structure applications.

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