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. Effects of friction factor and sidewall thickness on metal flow and boss forming were investigated by FEM. The results indicate that the bosses and the sidewall of the rectangular box are formed unevenly due to the uneven flow of the metal. The increase in friction factor at die/sheet interface improves the metal flow pattern and the efficiency of boss forming, but reduces the sidewall uniformity......
金板材；实心凸起；板锻造；分流面；缩孔机制 文章编号:1004-0609(2017)-11-2221-07 中图分类号:TG386.3 文献标志码:A 凸起结构(Boss structure),根据美国金属手册定义,即锻件表面上相对较短,通常为圆柱形的突起或突出部分[1].作为一种局部功能结构...实践价值.本文作者基于板锻造成形技术,针对底部带有实心凸起结构的铝合金筒形零件,采用拉深-墩挤板锻造成形工艺成形底部中心实心凸起结构,如图1所示,并结合有限元数值模拟及工艺试验,揭示凸起板锻造成形过程中的变形机理,探明凸起底部缩孔形成机制. 图1 实心凸起板锻造成形原理示意图 Fig. 1 Schematic diagram of solid boss forming......
SAMTECH软件:从飞机结构中复合材料板的大规模优化设计到细节结构的损伤分析 REMOUCHAMPS Alain1,BRUYNEEL Mickael1,MU Quan-chen2 (1.SAMTECH HQ,Liege,Belgium;2.SAMTECH Asia Pacific,Beijing,CHINA) 摘要:本文中介绍了当前最热门的趋势,即在工业领域的预先设计阶段中,复合材料的结构设计和解决方案可以在商业有限元软件SAMCEF与BOSS Quattro相结合的优化平台上来实现.这些解决方案,覆盖了从大规模复合材料结构的预先设计到高级的局部细节的研究,其中包括分层和裂缝增长.本文中的三个例子都来自于工业合作伙伴的描述. 关键词:Docnment code:A Article ID:1001-4381(2008)Suppl-0057-16; [全文内容正在添加中] ......
号:1672-7207(2019)11-2695-08 Research on heat-tensile flow stress and solid boss plate forging for 5052 aluminum alloy LIN Qiquan1, WANG Xiaowei1, DONG Wenzheng1, 2, 3, LI Yantao1, WANG Zhigang3 (1.... The numerical simulation results of the solid boss caused by plate forging was compared with those of the experiment of sheet forging. The results show that the flow stress of 5052 aluminum alloy decreases......
BESIII测量Xc J→ηη’的蒙特卡罗研究肖浩1,姬清平2,王至勇3,郑波11. 南华大学核科学技术学院2. 南开大学物理科学学院3. 中国科学院高能物理研究所摘 要:基于BOSS软件框架,利用BESIII合作组产生的400 M单举ψ(3686)事例,研究在BESIII探测器上实现测量到Xc J→ηη’分支比的可能性.以无信号事例的单举ψ(3686)样本为背景样本,以纯信号蒙特卡罗事例为信号样本,控制信号事例,在分别假设观测到Xc J→ηη’衰变过程信号显著水平为3σ和5σ的情况下,得到该过程对应的分支比.关键词:Xc J衰变;BESIII探测器;Xc J→ηη’测量;蒙特卡罗研究;......
客运专线用100m钢轨矫直断裂原因分析任安超1,2,吉玉3,周桂峰4,袁泽喜4,韩斌2,周剑华4(1.湖北省武汉市武汉钢铁(集团)有限公司研究院工艺技术研究所2.湖北省武汉市武汉科技大学 材料冶金学院3.武汉钢铁(集团)公司研究院,湖北武汉 4300804.武汉科技大学 材料与冶金学院,湖北武汉 430081)摘 要:客运专线用100m 60kg/m重轨在焊轨厂拼焊后,当四面矫直时发生断裂现象.采用光学显微镜及扫描电镜(SEM)等方法对钢轨矫直时断裂原因进行了分析和研究.结果表明:钢轨断裂是由于距钢轨端部约10......
to increase again and there were a lot of small boss with nodulation shape appearing on the nano-composite coatings surface. Key words:pulse electrodeposition; nano-composite coatings; deposition rate......
to refinement in grain structure of nano-composite coatings, but when it improved to 30 g·L-1, the crystallite sizes increase again and in the meantime there are a lot of small boss with nodulation shape......
of small boss with nodulation shape appearing on the nano-composite coatings surface.关键词:......
,which inhabited the growth of atomic beams.Reverse pulse currents eliminated concentration polarization and dissolved some surface boss of atomic beams.The solution of W and P atoms within Ni grains......
