Papers by Keyword: Deformation

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Authors: Bo Wen Zhang, Yong Da Yan, Zhen Jiang Hu, Xue Sen Zhao, Ying Chun Liang, Wei Dong Fei, Shen Dong
Abstract: As the dimensions of parts become smaller, understanding the mechanical properties of these small components was becoming more important. Till present day, the methods and technology used to investigate the deformation behavior in nanoscale were still lacking. In this paper, the specimens were single crystal copper wires with diameter in 50 microns. Atomic force microscope integrated with an in- situ tensile system were used to determine the mechanical behavior of copper wires and observe the surface topography deformation in nanoscale simultaneously. The results were as follows: the modulus of elasticity, tensile strength and failure strain of the sample were 167Gpa, 0.564GPa and 0.011, respectively. By using AFM, the separation process between the copper wire and impurities on it, such as oxide film, was observed. The nanoscale deformation process of the copper wire was also obtained.
Authors: Masanori Fujinami, Ryutaro Minei, Chang Gui Liu, Kenta Hara
Abstract: The in situ positron annihilation spectroscopy measurement has been developed and applied to investigate the structural change in free volume on the tensile deformation of linear low-density polyethylene. The pick-off lifetime of ortho-positronium (Ps) decreases by applying the strain and an aging variation cannot be observed. On the contrary the fraction of Ps formation gradually decreases day by day and becomes constant after several days. Further, after release of strain, it returns to the original value. The reason is considered to be that the molecular chains become rigid gradually during deformation and they lose the flexibility.
Authors: Y. B. Wang, M.L. Sui
Abstract: This paper reviews our recent studies on the effect of twin boundary (TB) on the deformation behavior in Cu with nanoscale growth twins. In situ straining transmission electron microscopy investigations on TB migration, TBs and twin ends acting as dislocation emission sources, and the interactions between dislocations and TBs are highlighted. Results provide some useful understanding of why Cu with nanoscale twins leads to a combination of ultrahigh strength and high ductility.
Authors: Yan Ping Sun, De Chen Zhang, Ming Yang, Yuan Li
Abstract: In this paper, iron ladle stress and deformation has been accurately calculated using finite element analysis software ANSYS based on 260t iron ladle in standing, lifting, tipping working conditions. Distribution of stress field was obtained. The stiffness and strength of the iron ladle has been evaluated. The results show that the iron ladle in the standing, lifting and tipping working conditions, structural deformation is small, the strength and stiffness meet the requirements. This research extends the working life of 260t iron ladle. It provides theoretical basis for producing and using of the iron ladle and further optimal designing.
Authors: Gui Rong Liu, Shi Hai Xiang, Xiao Ke Li, Shun Bo Zhao
Abstract: Under the background of engineering application, a 3-D FE analysis was carried out to evaluate the loading performance of a two-hole pair-arch tunnel under-across the main canal of South-to-North Water Transfer Project. In fact, the tunnel was constructed in integral longitudinally without obeying the design requirement of parting within certain length. The analysis showed that the vertical deformation and tensile stress along the longitudinal axis are obviously affected by the loads from main canal, moreover, the tensile stress exceeds the limit of tensile strength of concrete, which may lead thoroughly cracks on top plate of tunnel. This analysis determined the crack zone which should be dealt with.
Authors: Cong Shi, Yong Huang, Rui Liu
Abstract: In engineering practice, there is an increasing application of ram-compacted pile composite foundation for its economical and environmental consideration. In order to forward settlement property research of ram-compacted pile applied in high-speed railway deep soft ground treatment for the first time, and based on ram-compacted pile settlement data of trunk embankment near Beijing-Shanghai high speed railway Langfang station, this paper starts from 3D FEM analysis and provides the study on ram-compacted pile settlement characteristics. What more, settlement prediction using 3D FEM analysis is proved to be applicable and effective.
Authors: Tie Jun Wang, Wen Xu Zhang, Kikuo Kishimoto, Mitsuo Notomi
Abstract: Body-centered cubic unit cell models and three-dimensional finite element method are used to study the inelastic deformation of rubber particle modified polymers. Calculations are carried out for three loading conditions, i.e. uniaxial loading, plane strain deformation loading and the so-called 'equivalent shear' loading. Distributions of the localized shear deformation are presented to understand the microscopic deformation mechanisms of the polymers. Effects of particle size, particle volume fraction and loading conditions on the micro- and macroscopic deformation behavior of rubber particle modified polymers are discussed.
Authors: Ying Jun Jin, Tie Jun Wang
Abstract: The objective of the work is to numerically study the meso-scale deformation of amorphous glassy polymer. A molecular polymerization algorithm is employed to generate three-dimensional (3D) random networks of polymer, in which the micro-parameters and meso-structures, such as entanglement point, sliding point, etc. are considered. Then, 3D unit cell model and finite element method are used to calculate the stress and deformation relations of polymer. The evolution of meso-structure of glassy polymer with deformation is obtained simultaneously. Further, variation of the orientation of polymer chain with deformation was quantitatively studied.
Authors: Michael Ferry, Wan Qiang Xu, M. Zakaria Quadir, Nasima Afrin Zinnia, Kevin J. Laws, Nora Mateescu, Lalu Robin, Lori Bassman, Julie M. Cairney, John F. Humphreys, Adeline Albou, Julian H. Driver
Abstract: A focused ion beam (FIB) coupled with high resolution electron backscatter diffraction (EBSD) has emerged as a useful tool for generating crystallographic information in reasonably large volumes of microstructure. In principle, data generation is reasonably straightforward whereby the FIB is used as a high precision serial sectioning device for generating consecutive milled surfaces suitable for mapping by EBSD. The successive EBSD maps generated by serial sectioning are combined using various post-processing methods to generate crystallographic volumes of the microstructure. This paper provides an overview of the use of 3D-EBSD in the study of various phenomena associated with thermomechanical processing of both crystalline and semi-crystalline alloys and includes investigations on the crystallographic nature of microbands, void formation at particles, phase redistribution during plastic forming, and nucleation of recrystallization within various regions of the deformation microstructure.
Authors: Li Zhi Gu, Z. Zhang
Abstract: On the combination analog of the mussel ripple and leaf embrace, designed a new composite bottle cap consisting of the outer body, the inner lining washer, and the resin embrace, for multi-function, especially for better seal and ready open. According to the structural feature and the functional requirements of the cap, two fundamental components, the lining washer and the outer body, were abstracted into a plate and a cylinder with thin wall, respectively. Under the pressing force the elastic and plastic deformations of both were studied with Tresca’s yielding rule and the limitation of the plastic deformation was presented when the two components were assembled into a unit. For the production of this kind of bottle cap, the maximum value of the allowance press and the maximum pressing velocity were also provided.
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