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low-cycle fatigue of GH4169 alloy with hole structure[J]. The Chinese Journal of Nonferrous Metals, 2021, 31(3): 691-698. DOI: 10.11817/j.ysxb.1004.0609.2021-35943 疲劳失效是影响飞行器服役安全的重大问题.据报道[1],疲劳失效占发动机系... Sheet fatigue specimens with central hole (Unit: mm) 采用MTS-810液压伺服试验机测试了4种状态下的疲劳性能,温度为600 ℃,应力为820 MPa,频率为4 Hz,应力比R=0.1;采用PROTO LXRD的Mn Kα靶测试了在600 ℃时效1,10,20,50,100,200和500 h后的残余应力场,衍射角为152°.测试时,据孔边......
of the drilled holes. Key words: Al 1050 sheet; pulsed Nd?YAG laser; process parameters; drilled hole formation; temperature distribution; optimal drilling condition  ... of the hole and crumbling of the cut section, induced by direct contact of tools with the sheet metal [3, 5]. The merits of a Nd?YAG laser, including a high energy density, distinguished focusing......
中深孔微差挤压爆破法回采顶柱的实践王群1(1.广东省肇庆市高要市广东高要河台金矿)摘 要:针对河台金矿云西矿区顶柱开采技术条件,选择了中深孔爆破法回采方案.详述了中深孔爆破参数和爆破工艺.多排同段大药量微差挤压爆破技术的应用,有效地降低了顶柱回采生产成本,提高了生产能力,取得了较好的技术经济效果.关键词:顶柱回采; 中深孔; 微差挤压; 爆破参数......
,Yue Z.F.Effect of detail design on fatigue performance of fastener hole[J].Materials and Design, 2010, 31(2):976-980. [6] WEN Shi-zhen, Liu Cui-yun, WU Ruo-lin, MA Chao-li.The effect of hole extrusion...-heng, DU Xiao-kun. Effect of hole cold expansion on fatigue performance of corroded 7B04-T6 aluminum alloy[J]. International Journal of Fatigue, 2019, 126:210-220. [8] Z. Emami Geiglou,TN Chakherlou......
, 35(3): 4-8. WANG Guan-shi, DENG Xu, HU Shi-li, HONG Ben-gen, LUO Si-hai. A calculation model for intensity of single-hole liquid injection under Non-Darcy flow condition[J]. Mining and Metallurgical... absorbent polymer on wetting front of drip irrigation[J]. Transactions of the Chinese Society of Agricultural Engineering, 2006, 22(12): 1-7. Influence range of single hole injection of ionic rare earth......
章编号:1672-7207(2015)08-2857-06 Micro hole machining using double helix electrodes in electro discharge machining WANG Zhiqiang1, 2, GONG Hu1, 2, FANG Fengzhou1, 2 (1. State Key ...) Abstract: To improve the efficiency of electro discharge machining (EDM) micro hole and the depth to diameter ratio of micro hole, a proposed double helix electrode (DHE) was manufactured. Fluent software......
. The specimens had three joint members with different lengths of service hole. The estimation was given on the seismic performance of SCOPE system joint on the basis of the failure mechanism on the beam-column... the demand if they are well designed. The service hole length of the members can satisfy the seismic demand. Key words: seismic performance; SCOPE system; cyclic loading; hysteretic curve......
金属有机化学汽相淀积生长的本征氮化镓中持续光电导和复合机制的研究 王金延1,文正1,邓冬梅1,郝一龙1,吴春瑜2,王阳元1 (1.北京大学,北京,100871;2.辽宁大学,辽宁,沈阳,110036) 摘要:通过对室温下的本征氮化镓材料进行不同波长(360nm~377nm)的光照,分析了本征氮化镓中的持续光电导及其复合机制.实验的结果证明了两种持续光电导的特性:一种是快速的复合,而且分析表明关灯后这种复合机制导致的持续光电流下降幅度随着波长的增加而增加;另一种是速度较慢的复合,它的电流衰减幅度几乎不受波长的影响.基于这些现象,提出了一个可能的物理模型,认为第一种机制是由于导带电子被电子陷阱俘获而引起的,第二种是由于导带电子与空穴陷阱俘获的空穴之间的复合而造成的. 关键词:空穴陷阱; 电子陷阱; 光电导; 复合; hole traps; electron traps......
金属有机化学汽相淀积生长的本征氮化镓中持续光电导和复合机制的研究 王金延1,文正1,邓冬梅1,郝一龙1,吴春瑜2,王阳元1 (1.北京大学,北京,100871;2.辽宁大学,辽宁,沈阳,110036) 摘要:通过对室温下的本征氮化镓材料进行不同波长(360nm~377nm)的光照,分析了本征氮化镓中的持续光电导及其复合机制.实验的结果证明了两种持续光电导的特性:一种是快速的复合,而且分析表明关灯后这种复合机制导致的持续光电流下降幅度随着波长的增加而增加;另一种是速度较慢的复合,它的电流衰减幅度几乎不受波长的影响.基于这些现象,提出了一个可能的物理模型,认为第一种机制是由于导带电子被电子陷阱俘获而引起的,第二种是由于导带电子与空穴陷阱俘获的空穴之间的复合而造成的. 关键词:空穴陷阱; 电子陷阱; 光电导; 复合; hole traps; electron traps......
, soft and fibrous materials. It offers high energy density, the absence of a heat affected zone(HAZ), high performance, and an environment friendly process. In spite of these advantages, micro-hole...-machining of AWJ. The characteristics of a hole machined was investigated by the proposed AWJ process according to the ratio of water and abrasives. With the optimal experimental conditions, 3×3 array SiC......