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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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    Cutting Characteristic of Polycarbonate Sheet Subjected to Wedge Indentation by Knife Edge and Grooved Plate

    Shigeru NagasawaYuuya MasakiMasatoshi FujikuraYasushi Fukuzawa...
    P.602-607页
    查看更多>>摘要：Asymmetric plunge cutting by using grooved knife edge plate was proposed for advanced die cutting of a polycarbonate (PC) sheet. By varying the tip angle α_U and the tip thickness w_U of knife edge in the counter plate, and combining a standard steel cutting rule of 42° center bevel blade, a cutting load response of PC sheet was investigated and also that deformation was observed by a CCD camera. Through this works, the followings were found: 1) there were two deformation modes of sheared profile. 2) The tip thickness w_U was a primary factor, compared to the tip angle of α_U 3) The equivalent wedge angle effect was revealed with respect to the upper/lower angles α and α_U, while the PC sheet was bent up by the lower knife indentation.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    Machining Properties of Insulating ZrO_2 Ceramics Using Porous Copper Electrodes

    Yasushi FukuzawaKeiji YukihiroKen Yamasita
    P.608-613页
    查看更多>>摘要：Insulating ceramics were considered as machinable material with the electrical discharge machining method using the assisting electrode method, which was proposed and advanced by the authors. The mechanical properties changed with the experimental parameters, including the physical characteristics of the workpiece and the tool electrode. In this research, sintered ZrO2-Y2O3 insulating ceramics were subjected to EDM. To investigate the effects of the porous tool electrode material on the removal rate, the porous copper cylinder material was fabricated by PECS (pulse electric current sintering) method. The relative density changed from 60 to 95 wt%. The suitable machining characteristics could be obtained with a relative density of 85% at the positive electrode polarity. The shape of electrodes was transcribed on the workpiece surface more precisely than the solid copper electrode.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    Isothermal Rolling of Mg-based Laminated Composites made by Explosion Cladding

    Xin-Ping ZhangMing-Jen TanTing-hui YangJing-Tao Wang...
    P.614-619页
    查看更多>>摘要：Rolling of Al-Mg-Al tri-layer composite material fabricated by the explosion cladding method was simulated using finite element methods. The rolling temperature was determined based on the flow stresses of AZ31 magnesium alloy and 7075 Al alloy at elevated temperature. The strain distribution in the plates during rolling and effects of the reduction ratio on the separation in the Al/Mg/Al laminate were studied. The simulation agrees with experimental results.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    Formability of Ti-29Nb-13Ta-4.6Zr Biomaterial at High Temperatures

    Ming-Jen TanSyed Fida HassanToshikazu AkahoriMitsuo Niinomi...
    P.620-625页
    查看更多>>摘要：Ti-29Nb-13Ta-4.6Zr has been recently developed as a biomaterial showing most potential. The study here was conducted to investigate the high temperature deformation behavior under uniaxial tensile stress at various temperatures (i.e., 700℃, 800℃ and 900℃) with different initial strain rates at atmospheric condition. Results of the high temperature tensile tests show a significant improved elongation-to-failure of this novel biomaterial at elevated temperatures compared to open literature, and hence its formability potential.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    Evaluation of Novel Approach on Delamination Factor after Drilling Composite Laminates

    Chung-Chen TsaoKei-Lin KuoI-Chien Hsu
    P.626-630页
    查看更多>>摘要：Drilling is the most economic and convenient operation of secondary machining for hole making of fiber-reinforced materials owing to the need for structure joining. Delamination is commonly recognized as a major defect after drilling composite materials. In general, the delamination is an irregular shape and size, containing long and fine breaks and cracks at the exit of the drilled hole, especially in the drilling of carbon fiber-reinforced plastic (CFRP). The conventional delamination factor (F_a) is not appropriated to characterize the damage area because the shape of the delamination after drilled CFRP is not a regular representation of the damage magnitude. In this paper, a novel approach of the equivalent delamination factor (F_(ed)) is proposedand compared with the adjusted delamination factor (F_(da)) and the conventional delamination factor (F_a). The experimental results show the F_(ed) obtained is considered suitable for characterizing delamination at the exit of a hole after drilling composite materials.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    Process Technology and Performance Evaluation of Nylon 6/PU Stab Resistance Fabric Matrix

    Cho-Hsun LeeChing-Wen LouJin-Mao ChenHung-Jui Liang...
    P.631-636页
    查看更多>>摘要：Stab resistance compound fabric is frequently used in daily life, industry, military and aerospace. In this study, Nylon 6 and Polyester short fibers were mixed in ratio of 70:30. The mixture was needle punched at speed 300 needle/min to form a stab resistant fabric. The non-woven fabric matrix, non-woven fabric/grid matrix, non-woven/water-bone polyurethane (PU), and matrix/grid/water-bone PU, were put to test their tensile stress, tear stress, and stab resistance. Latter, the most stab resistant compound matrix was constructed in lamination structures to examine the relationship between thickness and stab resistance. The result showed that stab resistance of the non-woven/grid/water-bone PU compound fabric was 115 N; the triple-layered sample D was 208 N.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    Machining of Micro-channels on Brittle Glass Using an Abrasive Slurry Jet

    King Lun PangThai NguyenJingming FanJun Wang...
    P.639-644页
    查看更多>>摘要：This paper presents a study of using an abrasive slurry jet for the machining of micro channels on brittle glasses. The machined surface morphology and channel dimensions are used to assess the technology. Surface morphology was found featuring with two types of wave patterns; one was along the channels with large wave lengths as a result of the jet deflection during the motion of nozzle, and the other was due to viscous flow that resulted in smooth surface eroded predominantly by ductile mode. The investigation showed that using higher jet pressure and higher particle concentration enables to create channels with higher depth, although these widened the channels and degraded the surface quality in some cases by inducing a larger number of pit fragments on the surface. With proper control of the operating parameters, this technology can be used for machining micro channels on brittle materials with high quality of surface finish.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    A Study of Abrasive Jet Micro-Grooving of Quartz Crystals

    Alireza MoridiJun WangYasser M. AliPhilip Mathew...
    P.645-651页
    查看更多>>摘要：Owing to its various distinct advantages over the other machining technologies, abrasive jet machining has become a promising machining technology for brittle and hard-to-machine materials. An experimental study is presented on the micro-grooving of quartz crystals using an abrasive airjet. The effect of the various process parameters on the major machining performance measures are analysed to provide a deep understanding of this micro-machining process. Predictive models are then developed for quantitatively estimating the machining performance. The models are finally verified by an experiment. It shows that the model predictions are in good agreement with the experimental results under the corresponding conditions.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    Modelling and Simulation of Cutting Forces in Micromachining

    Shah Md. Mahfuzur RahmanJong-Leng Liow
    P.652-656页
    查看更多>>摘要：The analysis of cutting forces plays an important role in the design of machine tool systems as well as in the planning, optimization, and control of micro machining processes. Several parameters influence the cutting forces of which the friction is important in causing premature tool failure. This paper presents a force model that includes the friction force for sliding due to the contact between the tool and workpiece at the flank face. Simulation results were compared with the experimental results of Bao and Tansel [1] showing that the model can satisfactorily represent the cutting forces in two dimensional cutting.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    Experimental Study on the Chip Geometry and Shear Angle in Micro-Cutting Aluminum 7050-T7451

    Jun ZhouJianfeng LiJie Sun
    P.657-662页
    查看更多>>摘要：In this paper, the micro-scale machining characteristics of a non-ferrous structural alloy, aluminum 7050-T7451 is investigated through a series of cutting experiments. The effects of cutting speed and undeformed chip thickness on the chip geometry, cutting ratio, effective rake angle and shear angle in orthogonal micro-scale cutting of Al 7075-T7451 are presented. Explanations for the observed trends are also given.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd