材料期刊网

Application and Experiment on the Least-action Principle of Explosive Welding of Stainless Steel/Steel

Chang-gen SHI , Yu WANG , Si-jing LI , Jun YOU

钢铁

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Detonation Mechanism in Double Vertical Explosive Welding of Stainless Steel/Steel

Chang-gen SHI , Yu WANG , Lin-sheng ZHAO , Hong-bao HOU , Yu-heng GE

钢铁研究学报(英文版)

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An Example of the Scientists—Congratulate Professor SHI Changxu on His Seventyth Birthday

DirectorsBoardofInstituteofMetalResearch , AcademiaSinica

金属学报(英文版)

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镧-依文思蓝-氨基糖苷类抗生素的显色反应及其分析应用

江虹 , 胡小莉 , 刘绍璞 , 秦宗会 , 湛海粼

应用化学 doi:10.3969/j.issn.1000-0518.2003.09.016

在pH值为3.5～6.0,镧(Ⅲ)-依文思蓝(EB)与硫酸新霉素(NEO)、硫酸卡那霉素(KANA)、硫酸庆大霉(GEN)和硫酸妥布霉素(TOB)等氨基糖苷类抗生素反应可生成具有吸收峰和负吸收峰的三元蓝色离子缔合物.其最大吸收波长位于668～674 nm,线性范围从0～1.20×10-5g/mL至0～1.加×10-5g/mL,摩尔吸收光系数(ε)在3.10×104～6.17×104L/(mol@cm)之间;最大负吸收波长位于614～620 nm,线性范围从0～9.00×10-6g/mL至0～1.7×10-5g/mL,摩尔吸收光系数(ε)在4.33×104～1.04×105L/(mol@em).当用正负光吸收叠加时,灵敏度更高.探讨了反应条件、主要分析化学性质及三元缔合物的配合比(LA:EB:GEN=1:2:3).

关键词: 镧(Ⅲ),依文思蓝,氨基糖苷,抗生素,分光光度法

热致液晶共聚酯60PHB/PEN的热降解动力学研究--(Ⅰ) 非等温热降解动力学

张莉 , 马敬红 , 梁伯润 , 余亦华

高分子材料科学与工程

在氮气氛中采用热重分析的方法对热致液晶共聚酯60PHB/PEN的热降解动力学进行了研究.采用Friedman和Chang两种单一加热速率方法对活化能Ea、反应级数n和频率因子Z等降解反应动力学参数进行了分析.讨论了加热速率和计算方法对热稳定性及降解动力学参数的影响.

关键词: 热致液晶共聚酯 , 热降解 , 动力学 , 热稳定性

第27卷B辑作者索引

金属学报

Volu扣ne 27SeriesB1991AUTHOR INDEX CCAO Guanghan(曹光旱)············……6一B科6CAo weijie(曹卫恋)..················……5一B32oCAO Yilin(曹益林)··················……6一B443CHANG Xin(常听)···············……1一B48CHE Guang邻n(车广灿)·············一6一B科0CHEN Erbao(陈二保)···············……6一B410CHEN Jia....

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复合材料层合板低速冲击逐渐累积损伤预测方法

徐颖 , 温卫东 , 崔海坡

材料科学与工程学报 doi:10.3969/j.issn.1673-2812.2006.01.020

针对复合材料层板在冲击载荷下,各种损伤的产生和扩展是一个随载荷、时间和空间而演变的过程,发展了复合材料层合板低速冲击逐渐累积损伤预测方法.采用刚度退化技术和改进的Chang-Chang失效准则、显式有限元法来模拟复合材料层合板受到低速冲击下逐渐损伤过程.使用所发展的方法分析了[0m/90n/0m]铺层的复合材料层合板在低速冲击过程中的逐渐损伤扩展,结果表明本文的方法能较好地模拟复合材料层板在低速冲击下的损伤扩展及变形过程,计算结果与实验结果吻合较好;对不同冲击能量下层合板损伤扩展研究表明,冲击能量与分层损伤面积成线性关系.

关键词: 复合材料层合板 , 冲击 , 逐渐累积损伤 , 破坏机理 , 数值模拟

基于低能量冲击损伤阻抗的复合材料薄壁结构铺层顺序设计

张鹏飞 , 金海波

复合材料学报

建立了有效的复合材料层合板结构冲击损伤分析方法,层合板面内损伤采用改进的Chang/Chang失效准则做判据,得到面内各类损伤形式.层间损伤采用与Mixed-Mode粘接元等效的TIEBREAK接触模拟.利用此分析方法,从复合材料薄壁结构设计需要出发,研究了在低能量冲击下,铺层的层间角度、铺层方向、铺层重叠对层合板结构冲击损伤阻抗的影响规律,并对它们的综合影响进行了总体分析,得到了能提高层合板结构损伤阻抗的铺层顺序设计指导.最后用该设计指导对某种铺层结构进行了重新设计和有限元模拟,验证了该设计指导的可行性和有效性.

关键词: 冲击损伤 , 分层损伤 , TIEBREAK接触 , 铺层顺序 , 损伤阻抗

FORMATION OF Fe—N COMPOUNDS BY LASER NITRIDATION IN AN ATMOSPHERIC AMBIENT

Y.L.Yang , F.J.Sun , D.Zhang

金属学报(英文版)

The formation of Fe-N compounds by laser nitriding in an atmospheric ambient was reported.By CW-CO2 laser irradiation on pure ferrite iron in the atmospheric am-bient,Fe-N compounds (including Fe2N,Fe3N and Fe4N) are formed as a result of a laser-enhanced and temperature-enhanced reactions.The samples were analyzed with X-ray diffraction.It is found that the laser power density,scanning speed and nitro-gen temperature are the main factors influencing the formation of Fe-N compounds.Nitrogen can be activated by pre-heating at some temperature.Nitrogen activation and sample surface melting by CW-CO2 laser greatly enhance the reaction between the sample surface and nitrogen beam.After annealing at 500℃ for Sh,some Fe2N and Fe3N converted into more stable Fe4N.

关键词: laser nitriding , null , null

Relationship between the Brittlement Susceptibility and H Permeation Current for UNS G11180 Steel in 5% NaCl Solution with H_2S

Xueyuan ZHANG and Yuanlong DU(State Key Lab. for Corrosion and Protection , Institute of Corrosion and Protection of Metals , Chinese Academy of Sciences , Shenyang 110015 , China)

材料科学技术（英文）

Sulfide stress corrosion cracking (SSCC) behaviour of UNS G11180 steel in 5% NaCl solution with H2S was studied by slow strain rate tensile test (SSRT), SEM and electrochemical hydro gen permeation technique. The results reveal different cracking mechanism and H permeation current (IH) through UNS G11180 steel plate in different concentration of H2S solution. The susceptibility to SSCC of UNS G11180 Steel in 5% NaCl solution with H2S was evaluated by the permeation current(IH, μA), which depends on the concentration (c×10-6) of H2S by the equation:IH = 8.525 ×c0.7249. lt is proved that the electrochemical H permeation method is a practical way to assess the susceptibility to SSCC.

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