Functionally graded materials have gained significant interest within the research community in recent years. Functionally graded materials are advanced composites in which local material properties are tailored to suit application requirements by altering the volume fraction ratios of two or more constituents. In this article, the behavior of metal-ceramic functionally graded material plates under low-velocity, medium-energy impact loading is considered using experimental and computational techniques. A series of impact tests were conducted on monolithic and functionally graded plates composed of titanium and titanium boride. The tests were performed using a vertical drop test apparatus in which highly controlled impacts of up to 108 J were delivered to the center of the top surface of each plate. The opposing bottom surface of each plate was instrumented with strain gauges wired into a high-speed data acquisition system to collect strain histories throughout the duration of the impact event. A sophisticated finite element model of the test was constructed to simulate the conditions ofthe experiments. Two distinct material models were used in the finite element analyses to study the monolithic and graded plates. The first model used analytical expressions based on the local volume fractions of the constituents to generate homogenized-material properties for the mixtures of titanium and titanium boride. The second model randomly distributed cells containing titanium elements and titanium boride elements constrained to satisfy local volume fraction ratios in the monolithic and graded specimens. The strain histories from the experiments were compared with the analogous solutions from the finite element model analyses to validate the computational models used in the study. Specifically, analyses with respect to historical trends, maximum strain magnitudes, and strain-rate effects were performed to gain insight into the impact response of the plate structures. The key contribution is validation of functionally graded material models and a computational framework for studying the impact response of functionally graded material plates as a foundation for investigations of more severe impact loads.
Impact response of titanium and titanium boride monolithic and functionally graded composite plates
Stoßfestigkeit von monolithischen und Funktionsgradientenwerkstoffen basierend auf Titan und Titanborid
AIAA Journal ; 47 , 3 ; 676-691
2009
16 Seiten, 21 Bilder, 9 Tabellen, 43 Quellen
Aufsatz (Zeitschrift)
Englisch
Impact Response of Titanium and Titanium Boride Monolithic and Functionally Graded Composite Plates
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