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Exoerimental and Numerical Study of Transverse Impact Response of TiNi Phase Transformation End Clamped Beam

Author: HuangHe
Tutor: TangZhiPing
School: University of Science and Technology of China
Course: Engineering Mechanics
Keywords: Phase transition beam Pseudo-elastic Phase transformation hinge Martensite content Lateral impact Axis force Clamped Conditions Energy consumption rate
CLC: O347.3
Type: Master's thesis
Year: 2011
Downloads: 33
Quote: 0
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Abstract


TiNi alloy is the study of the earliest and most widely used of a shape memory alloy materials in the aerospace, machinery and electronics, biomedical, due to the shape memory effect and superelasticity, and excellent corrosion resistance and biocompatibility, it and other fields have a wide range of applications. However, the current research on the the TiNi alloy material performance is relatively mature, the study of the mechanical response of the phase transition of structural components is still in the exploratory stage. Combined with the characteristics of the structural parts of the the TiNi alloy material superiority, give full play to the advantages of the two will be the direction of further research. The most widely used in the paper selected engineering basic structural components - beams, as research subjects. Systematic studies from both experiment and numerical simulation of lateral impact, pseudo-elastic TiNi alloy clamped beam dynamic mechanical response characteristics. Reveal phase transformations, development and evolution, analysis of the phase transition beam energy dissipation mechanism. These conclusions can provide important reference for the the TiNi beam theory research and practical application. On the experimental side, the paper clamped beam experiments fixtures have been many improvements in order to ensure the full realization of the conditions of clamped, and conducted in-depth discussion specifically clamped boundary conditions for the realization of its impact on the experimental results. On this basis, the use of SHPB device clamped beam of rectangular cross-section TiNi different the bullets length and projectile velocity impact experiments, compared with elastoplastic beam. Experimental results show that: 1, the entire TiNi clamped beam response process can be divided into early fluctuations in response to the overall structure of the response, and the late free vibration of three stages, mainly the feature early fluctuations in response to elastic bending wave propagation, fluctuations in response and structure The response time cut-off point is is about 0.5ms about. 2, the phase change occurs first in the impact point and the vicinity of the fixed end. As the load increases, the local strain concentrated form phase transformation hinge beam into the hinge mechanism. Compared with traditional plastic hinge, phase transformation hinge recoverable, there is no residual deformation after unloading. , Clamped beams in the the bullets impact of axial force effect is very significant, resulting in tensile side compression side strain amplitude showing asymmetry. Due to the superposition of the axial tensile stress will first stretch side to form a \With the increase in the energy of the bullet enter the the TiNi clamped beam energy consumption rate was significantly improved. In the same bullet initial kinetic energy, short bullets energy absorption efficiency higher than long bullet. 5, compared with the experimental results of Izod impact TiNi clamped beam deflection smaller axial force greater. Numerical simulation using finite element software LS-DYNA numerical simulation study of the impact test TiNi clamped beam bullets. The results showed that: 1, numerical results confirmed unilateral hinge bullets under the impact of phase transformation hinge formed in the the TiNi clamped beam of the point of impact and the vicinity of the fixed end. 2, bullet impact of TiNi clamped beam dynamic impact load displacement curve can be divided into: impact shocks segment, load hardening segment, two-phase elastic, uninstall the linear segment, unloading platform segment and the uninstall is complete paragraph six stages. Phase transition beam bullets under the impact of the dynamic response behavior of its material which martensitic transformation state has a close relationship between the impact and interaction. Of TiNi clamped beam under lateral impact dynamic response characteristics are determined by the nature of the shock loading, and beam geometry. 5, the bullet under the impact of TiNi clamped beam by local material phase change to dissipate energy when the input energy is increased to a certain value, the material enters the elastic portion of the two-phase, energy reaches saturation is no longer increases.

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CLC: > Mathematical sciences and chemical > Mechanics > Solid Mechanics > Deformation solid dynamics > The strength of the materials under impact loading
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