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Key engineering materials
Trans Tech Publications Ltd.
Key engineering materials

Trans Tech Publications Ltd.

半月刊

1013-9826

Key engineering materials/Journal Key engineering materials
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    Molecular Dynamics Simulation of Rubbing Phenomena in Ultra-Precision Abrasive Machining

    Jun ShimizuLibo ZhouTakeyuki YamamotoHan Huang...
    P.417-422页
    查看更多>>摘要：This study aims to clarify the friction and wear phenomena, which are of great importance in abrasive machining with atomic-scale material removal, such as polishing of magnetic disk substrates and CMP of semiconductor substrates. Various phenomena that occurred when a well-defined copper surface rubbed by an extremely fine rigid diamond abrasive, such asthe sliding without removal and the atomic-scale wear, were analyzed using a molecular dynamics model, in which the abrasive grain was connected to a three-dimensional spring and the holding rigidity of the abrasive grain was taken into account. A series of simulations using different indentation depths clarified that the one- or two-dimensional atomic-scale stick-slip phenomenon in proportion to the period of atomic arrays of workpiece surface occurred in the sliding processes without atomic removal. The results also demonstrated that the period and amplitude of the fundamental stick-slip wave varied when accompanied with atomic removal due to the increase in normal load.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    Modeling of Depth of Cut in Abrasive Waterjet Cutting of Thick Kevlar-Epoxy Composites

    Tauseef Uddin SiddiquiMukul Shukla
    P.423-427页
    查看更多>>摘要：Abrasive water jet cutting (AWJC) is one of the widely used non-conventional techniques for cutting difficult-to-cut materials like composites, super alloys and ceramics. However, while conducting initial trials the inability of the jet to cut through the workpiece is a major problem particularly in thicker materials. Therefore an accurate prediction of depth of cut (DOC) is absolutely necessary to achieve through cuts and more so to minimize delamination in polymer matrix composites. In this paper, a semi-empirical model is developed using non-linear regression analysis for prediction of DOC in AWJC of thick Kevlar-epoxy composites. Further, the model is verified by conducting experiments within the investigated range of process parameters and a good agreement is obtained between the two.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    Prediction of Erosion Profiles during ECM of Spiral Holes

    M.H. WangQ.F. ZhangC.K. ZhuC.Y. Yao...
    P.428-432页
    查看更多>>摘要：In this study the prediction of the erosion profiles during ECM of the spiral hole was presented. By assumptions, the major points were simplified into one-dimensional problems. The theoretical and computational model was built to illustrate the profile movement as the time elapses. The analysis was based on the law of electrolysis and the software MATLAB was used. Verifications were done through experiments and the deviation was 7.5% between theoretical and experimental result. On the basis of the prediction of the erosion profile, the applied parameters could be estimated.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    Chipping Brittle Materials: A Finite Element Analysis

    Seyed Saleh MostafaviL.C. ZhangJason Lunn
    P.433-438页
    查看更多>>摘要：Edge chipping by an indenter has been used to investigate the fragmentation of brittle materials. This paper proposed a constitutive model for studying both the initiation and propagation of cracks during the chipping of concrete. The analysis was carried out by the finite element method using a commercially available code, LS-DYNA. The results showed that a zone with very high compressive stresses appears beneath the indenter and causes the material to break or crush. Most of the external work, about 78%, was dissipated in the crushing zone while only a small percentage (less than 17%) contributed to form chips/fragments. As the indentation proceeded, radian-median cracks initiated and propagated downward and parallel to the front surface of the material to form a half penny crack. The crack tips from both sides of the indenter on the surface would then deviate toward the free edge, leading to a chipping scallop at a critical load.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    Research on the Removal Mechanism of Engineering Ceramics Based on Energy Density

    X.L. TianB.G. ZhangJ.F. YangF. Guo...
    P.439-444页
    查看更多>>摘要：Based on the calculation of energy density for several kinds of non-traditional machining process of engineering ceramics, the material removal mechanism for ceramics was studied. The studies revealed that the key reason for these technologies to machine ceramics effectively is high-energy-density. For Laser machining, EDM and plasma arc cutting, the material was removed by the high temperature ablation while the high density energy is applied to material surface. For high pressure abrasive water jet machining, the material was removed by erosion using the abrasive particles with high density energy. The ceramics was machined by micro-detonation arc under the synergy of ablation and erosion.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    Research on Tooth Trace Modification of Spur Bevel Gear

    Dong YangHuanyong CuiXijie TianQingping Zhang...
    P.445-449页
    查看更多>>摘要：Based on the gear geometry theory and the normal meshing motion equation of gear pairs, changes of meshing points and angles are analyzed and the effect of tooth trace modification on gear pair meshing movement is discussed. It is concluded that chemical milling can effect tooth trace involute modification of fine-forged spur bevel gear, improve its surface quality and dimensional precision and therefore prolong its service life.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    In-situ Observation and Anisotropy of Free Surface Roughening for Polycrystalline Metals

    Tsuyoshi FurushimaTetsuro MasudaKen-ichi Manabe
    P.450-455页
    查看更多>>摘要：To understand the free surface roughening phenomena of polycrystalline metals, the surface roughening behaviors of three kinds of metal sheets were investigated under uniaxial tension. The materials used were AZ31 magnesium alloy, SPFC 590Y steel, and A5052-O aluminum alloy. In the in-situ observation of surface roughening for AZ31 magnesium alloy, it seemed that the surface of each grain roughened independently and the roughness increases with increasing plastic strain. In contrast to A5052-O and SPFC, the anisotropy of free surface roughening was observed for AZ31 magnesium alloy. Compared with planar anisotropy Δr, the microscopic anisotropy of surface roughening is not related to Δr. In AZ31 magnesium alloy, the anisotropy of surface roughening arises and, instead of the r-value, another parameter is needed to evaluate the anisotropy of free surface roughening.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    Edge Chipping of Rock: An Experimental Study

    Qingyu YaoL.C. ZhangRonghao BaoJason Lunn...
    P.456-461页
    查看更多>>摘要：This paper investigates experimentally the edge chipping of a rock to assess the cutting performance of a conical and a pyramidal tip. It was found that the conical tip generates many radiated cracks and results in a larger amount of fine rock grains due to crashing. The size of chips produced by the pyramidal tip is bigger. It was concluded that the critical chipping energy has approximately a linear relation with h~(9/4) of which h is the depth of cut of the tip.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    Microstructure and Properties of TiAlN/AlN Composite Film Deposited on Cam's Profile by Ion Beam Sputtering Technique

    Peiquan GuoShouren WangHuanyong Cui
    P.465-468页
    查看更多>>摘要：The study reports a new surface formation technology during manufacturing process of parallel indexing cam mechanism, ion beam sputtering deposition, in which the operation temperature can be controlled below the limitation of phases exchanging or at room temperature. Phase exchanging deformation can be avoided and the shape accuracy and dimension accuracy can be improved compared with surface quenching process. The microstructure and properties of TiAlN/AlN composite film deposited on the profile surface of cam (made of 45 steel) by ion beam sputtering deposition were discussed. X-ray diffraction (XRD), scanning electron microscopy (SEM) and transmission electron microscope (TEM) analysis has been used to characterize film's microstructure and properties. The micro-hardness and adherence grade were tested.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    Wear Characteristics and Adhesion Behavior of Calcium Phosphate Thin-films

    M. HamdiJ.A. ToqueA. Ide-Ektessabi
    P.469-474页
    查看更多>>摘要：Wear resistance is an important mechanical property expected from coatings intended for any type of applications. Understanding of this quantity is very practical because in real situations, coatings are subjected to repeating loads experienced not in a gradual orderly fashion but abruptly and indeterminately. This study looked into the wear characteristic and adhesion behavior of calcium phosphate, a known bioceramics, and hopes to provide better understanding of these properties. Radio frequency-magnetron sputtering (RF-MS) was used to deposit thin film (CaP) on glass. The coatings were subjected to single-pass microscratch and multi-pass wear test while monitoring the depth, load and displacement in situ. The results have shown that the changes in the surface topography can give an indication of the wear resistance of CaP. Coatings with good adherence to the substrate have shown less alteration of its surface roughness, measured in terms of Ra values, even after several scratch passes. The study on the different parameters revealed that deposition time is the most influential factor in CaP wear behavior. This was attributed to its correlation with coating thickness. Analysis of variance (ANOVA) also suggested that the other sputtering parameters studied in the experiments (argon pressure and RF power) did not have very significant effect on the wear pattern of the CaP thin films.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd