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Simulation of Dynamic Mechanical Behavior of Near Lamellar TiAl at Elevated Temperature Containing the Grain Boundary Effect

Author: LuShan
Tutor: LiZiRan
School: University of Science and Technology of China
Course: Solid Mechanics
Keywords: The nearly lamellar Organization TiAl Voronoi algorithm Grain boundary Dynamic tensile Finite Element
CLC: O733
Type: Master's thesis
Year: 2011
Downloads: 45
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Abstract


Nearly lamellar TiAl ( referred NL TiAl) in the numerical calculation , and further improve the numerical calculations of the NL TiAl the Voronoi algorithm - based three-dimensional finite element model , and the introduction of a grain boundary effects . Based on the theory of crystal plasticity , the introduction of the grain boundary constitutive consider slip and content , the development of a more reasonable taking into account the dislocation glide , deformation twins and grain boundary deformation of TiAl constitutive model . NL TiAl based on Voronoi algorithm , to reflect the distribution of crystal group size , shape , spatial orientation are randomly change 3D polycrystalline finite element model to describe the grain boundaries between the crystal group by shell elements introduced at the junction of the grain group , and examine the impact on the calculation results of the model size and the number of units . On this basis , each grain group is further divided into a number of grains and the introduction of the shell element in grains and between grains , and thus better reflect the true NL TiAl microstructure . The finite element model of the use of more than two different temperatures (room temperature , 500 ° C , 700 ° C ) and tensile strain rate ( the 10-3 s -1 320 s -1 < / sup>, 800 s -1 , 1350 s -1 ) the NL of TiAl elastoplastic mechanical behavior numerical simulation . The results show that the two models simulated stress-strain curve with the experimental results fit better to reflect the NL TiAl material response under different temperature and strain rate . This article also examines the impact of the grain boundary for the mechanical behavior of materials . The calculation results show that included in the NL TiAl grain boundary effects , the stress distribution within the crystal group changed obviously , will have some of the stress concentration in the grain group near the grain boundary . In addition, the the grain group grain boundary twins impediment exists and makes a the twin crystal crystal group near the grain boundary unit number of points to be slightly lower than the the polycrystalline overall average number of points of the twin crystal . Finally, the full text of work summary and outlook .

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CLC: > Mathematical sciences and chemical > Crystallography > Crystal physics > The mechanical properties of the crystal
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