Publicación: SIMULATION OF THE INFLUENCE OF THE RADIAL GRADED POROSITY DISTRIBUTION ON ELASTIC MODULUS OF / PHASE TI-BASED ALLOY FOAMS FOR BONE IMPLANT
Fecha
2023
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Resumen
THIS RESEARCH AIMS TO EXAMINE HOW A RADIAL GRADED POROSITY DISTRIBUTION AFFECTS THE ELASTIC MODULUS BY CONDUCTING SIMULATIONS ON TI-BASED ALLOY FOAMS WITH FACE-CENTERED CUBIC AND BODY-CENTERED CUBIC CRYSTAL STRUCTURES. FOUR TYPES OF FOAMS WERE ANALYZED; COMMERCIALLY PURE-TI, TI-13TA-6MN (TTM), TI-13TA-(TT) AND TI-13TA-6SN (TTS), (ALL IN AT.%). FOUR RADIAL GRADED POROSITY DISTRIBUTION CONFIGURATIONS WERE MODELED AND SIMULATED USING THE FINITE ELEMENT ANALYSIS (FEA). THE RADIAL GRADED POROSITY DISTRIBUTION CONFIGURATIONS WERE GENERATED USING A MATERIAL DESIGNER (ANSYS) WITH A PORE RANGE OF 200 TO 600 ?M. THESE RADIAL GRADED POROSITY DISTRIBUTIONS HAD AVERAGE POROSITY VALUES OF 0, 20, 30 AND 40%. THE CONSOLIDATED SAMPLES THAT WERE OBTAINED THROUGH A POWDER METALLURGY TECHNIQUE IN TWO STEP SAMPLES WERE SYNTHESIZED USING A POWDER METALLURGY TECHNIQUE, WITH THE ELASTIC MODULI VALUES OF THE AFOREMENTIONED TI BASED ALLOYS BEING MEASURED BY ULTRASOUND USING ~110, ~69, ~61 AND ~65 GPA, RESPECTIVELY. THE RESULTS SHOWED THAT THE MODULUS DECREASED AS A FUNCTION OF POROSITY LEVEL IN ALL SIMULATED MATERIALS. THE TTM, TT AND TTS FOAMS, WITH AVERAGE POROSITIES OF 20, 30 AND 40%, EXHIBITED AN MODULUS SMALLER THAN 30 GPA, WHICH IS A REQUIREMENT TO BE USED AS A BIOMATERIAL IN HUMAN BONES. THE TT FOAMS SHOWED THE LOWEST MODULUS WHEN COMPARED TO THE OTHER FOAMS. FINALLY, CERTAIN THEORETICAL MODELS WERE USED TO OBTAIN THE MODULUS, THE BEST BEING; THE GIBSON?ASHBY MODEL (? = 1 AND N = 2.5) FOR THE CP-TI FOAMS AND KNUDSEN?SPRIGGS MODEL (B = 3.06) FOR THE TTM, TT AND TTS FOAMS.
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Ti-based alloys, simulation, radial graded porosity, foam, elastic modulus
