期刊文献+
共找到4篇文章
< 1 >
每页显示 20 50 100
MICRO MECHANICAL ANALYSIS OF 3-D WOVEN COMPOSITES 被引量:2
1
作者 周光明 周储伟 王新峰 《Transactions of Nanjing University of Aeronautics and Astronautics》 EI 2004年第3期163-167,共5页
A micro mechanical model is carried out to predict micro stresses and macro elastic properties of 3-D woven composites. A unit cell is composed of two phases. One is fiber yarn and the other is resin or fiber yarn in ... A micro mechanical model is carried out to predict micro stresses and macro elastic properties of 3-D woven composites. A unit cell is composed of two phases. One is fiber yarn and the other is resin or fiber yarn in transverse. The additional shearing introduced by bending of fiber yarn is considered. The method to determine the microstructure is also discussed. This model is applied to the analysis of a 3-D woven graphite/epoxy composite. Micro stresses of the cell are studied, and then macro modulus is obtained by employing the average method. The predictions agree well with experimental results. 展开更多
关键词 micro mechanics 3-d woven composites Galerkin method
下载PDF
Challenges and opportunities in the production of magnesium parts by directed energy deposition processes
2
作者 Gürel Cam Ali Günen 《Journal of Magnesium and Alloys》 SCIE EI CAS CSCD 2024年第5期1663-1686,共24页
Mg-alloys have gained considerable attention in recent years for their outstanding properties such as lightweight,high specific strength,and corrosion resistance,making them attractive for applications in medical,aero... Mg-alloys have gained considerable attention in recent years for their outstanding properties such as lightweight,high specific strength,and corrosion resistance,making them attractive for applications in medical,aerospace,automotive,and other transport industries.However,their widespread application is hindered by their low formability at room temperature due to limited slip systems.Cast Mg-alloys have low mechanical properties due to the presence of casting defects such as porosity and anisotropy in addition to the high scrap.While casting methods benefit from established process optimization techniques for these problems,additive manufacturing methods are increasingly replacing casting methods in Mg alloys as they provide more precise control over the microstructure and allow specific grain orientations,potentially enabling easier optimization of anisotropy properties in certain applications.Although metal additive manufacturing(MAM)technology also results in some manufacturing defects such as inhomogeneous microstructural evolution and porosity and additively manufactured Mg alloy parts exhibit lower properties than the wrought parts,they in general exhibit superior properties than the cast counterparts.Thus,MAM is a promising technique to produce Mg alloy parts.Directed energy deposition processes,particularly wire arc directed energy deposition(WA-DED),have emerged as an advantageous additive manufacturing(AM)technique for metallic materials including magnesium alloys,offering advantages such as high deposition rates,improved material efficiency,and reduced production costs compared to subtractive processes.However,the inherent challenges associated with magnesium,such as its high reactivity and susceptibility to oxidation,pose unique hurdles in the application of this technology.This review paper delves into the progress made in the application of DED technology to Mg-alloys,its challenges,and prospects.Furthermore,the predominant imperfections,notably inhomogeneous microstructure evolution and porosity,observed in Mg-alloy components manufactured through DED are discussed.Additionally,the preventive measures implemented to counteract the formation of these defects are explored. 展开更多
关键词 Additive manufacturing DED processes Arc-dED Wire arc additive manufacturing(WAAM) 3-d printing High deposition rate
下载PDF
激光大尺度3维动态聚焦扫描加工系统研究 被引量:6
3
作者 李东华 邓磊敏 +2 位作者 段军 曾晓雁 游欣易 《激光技术》 CAS CSCD 北大核心 2016年第4期466-471,共6页
为了满足激光3维微加工不断提高的精度要求、不断增大的加工尺寸范围,以及加工效率的上升需求,采用理论分析和计算结合的方法,研制出由动态聚焦镜和2维扫描振镜组合的动态聚焦系统,与高精度X-Y-Z 3维高精度工作台集成为一台激光大尺度3... 为了满足激光3维微加工不断提高的精度要求、不断增大的加工尺寸范围,以及加工效率的上升需求,采用理论分析和计算结合的方法,研制出由动态聚焦镜和2维扫描振镜组合的动态聚焦系统,与高精度X-Y-Z 3维高精度工作台集成为一台激光大尺度3维动态聚焦扫描加工设备。设计了焦距为100mm、视场角±15°、光阑口径7mm、后工作距137mm、相对畸变小于0.5%的远心f-θ镜和入光口径8mm、光学杠杆比1∶8、后工作距800mm±40mm的动态聚焦镜系统,并使用ZEMAX软件对系统关键光学部件动态聚焦镜和远心f-θ镜进行光学设计及系统性能评价。结果表明,通过工艺控制软件分层拼接,实现了460mm×310mm×50mm大尺度3维动态聚焦的高精度紫外激光微加工功能,在该3维扫描范围内,激光聚焦光斑直径始终保持小于10μm,从而满足大尺度激光3维精密微加工需求。 展开更多
关键词 激光技术 3维动态聚焦 光学设计 3维微加工
下载PDF
Measurement and Compensation of Deviations of Real Tooth Surface of Spiral Bevel Gear 被引量:8
4
作者 王军 王小椿 +1 位作者 姜虹 冯文军 《Chinese Journal of Aeronautics》 SCIE EI CAS CSCD 2003年第3期182-186,共5页
This paper presents a method for measurement of deviation of the real gear tooth surface from the theoretical one with a coordinate measurement machine and compensation of repeatable parts. By investigation of charact... This paper presents a method for measurement of deviation of the real gear tooth surface from the theoretical one with a coordinate measurement machine and compensation of repeatable parts. By investigation of characteristics of distortion of the gear tooth surface along the circle direction, the deviation is derived from distortion, and the definition of deviation with the geometrical invariability is proposed. Then the approach for determination of the location and orientation of the gear with respect to the coordinate measurement machine and the measurement way are developed. The deviation is represented with a difference surface, and an algorithm for derivation of parameters of global form deviations from the discrete points has been provided. Finally, the compensation approach is discussed. 展开更多
关键词 machine manufacture automation COMPENSATION spiral bevel gear 3-d measurement
下载PDF
上一页 1 下一页 到第
使用帮助 返回顶部