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reduction-SHS melting process were investigated. The high titanium ferrous alloys were characterized by XRD,SEM and chemical compositions analysis technologies. The results indicate that the adiabatic...%~9.20%, 16.15%~20.53% and 2.78%~3.82%, respectively. Key words: thermit reduction-SHS; high titanium ferrous with low oxygen; adiabatic temperature; unit reaction heat; inclusion 高钛铁(含钛量65%~75%,质量分数,下同)合......
showed the formation of adiabatic shear band (ASB). Key words: AZ31B magnesium alloy; post-weld heat treatment; ballistic behaviour; penetration depth; adiabatic shear band 1 Introduction In recent.... JHA et al [11] determined the ballistic limit of aluminium 2219 alloy plates with 6.4 and 7.8 mm in thickness joined by tungsten inert gas (TIG) welding. They observed the formation of adiabatic......
应变率敏感系数C进行了修正,修正后预测结果与实验数据吻合得很好,最大相对误差为–3.4%.比较3种钨合金JC模型的参数,判断出细晶钨合金最易形成绝热剪切带.关键词:霍普金森压杆;细晶钨合金;Johnson-Cook模型;绝热剪切带(adiabatic shear band,ASB);......
to reveal adiabatic shearing behavior of recovered samples. Results show that both the two alloys manifest significant strain hardening effects. Critical damage strain rate of the two alloys is about 4.3 9 103s-1, under which the impact absorbs energy of Ti–5Al–2.5Sn ELI and Ti–8Al–1Mo–1V are 560 and 470 MJ m-3, respectively. Both of them fracture along the maximum shearing strength orientation......
Calculation of rotation and shearing dislocation deformation of underlying shield tunnels due to foundation pit excavation WEI Gang1, 2, ZHANG Xinhai1 (1. College of Civil Engineering and Architecture..., supplemented by the rigid body rotational deformation, accounting for 10%-30%. Key words: excavation of foundation pit; shield tunnel; deformation model; shearing dislocation; rigid body rotation effect 随着城......
during asymmetrical rolling process. The factors affecting the bending were discussed. Key words: asymmetric rolling; shearing deformation; 5182 aluminium alloy; plate shape; microstructure......
words: paste backfill; anti-segregation index; shearing resistance; yield stress; vibrational segregation rate 膏体充填采矿技术因其突出的经济性,安全性和环保性,受到了广泛的关注,已被运用到越来越多的矿山.随着地下开采工作的推进,充填料浆逐步回填到地下采空区,以支撑上覆岩层,防止地表塌陷及顶板冒落......
that the recovery, recrystallization and grain growth of magnesium alloy at the binding region occur with increasing the heating temperature and prolonging the holding time, and the explosive adiabatic shear bands... word: Al/Mg composite; AZ31B/7075 composite explosive recombination; interface evolution; diffusion layer; adiabatic shear bands; shear strength 爆炸复合界面两侧区域因高能量冲击波作用而发生剧烈的塑性变形[1],两侧材料均产生一定程度的硬......
40CrNi2Mo钢中厚靶板的抗枪弹行为研究 董瀚1,李晓源1,时捷1 (1.钢铁研究总院,结构材料研究所,北京,100081) 摘要:利用卵形尖头弹丸垂直撞击40CrNi2Mo钢中厚靶板,观察不间弹速下钢板出现的损伤形貌,评定背面强度极限,分析了穿甲机制与抗弹性能的关系.结果表明,抗拉强度小于1 270 MPa时,钢板以塑性扩孔形式穿甲.利用两阶段塑性扩孔模型计算出的钢板塑性扩孔耗能与实验吻合较好.由于强度是影响塑性扩孔耗能的主要因素,因而钢板的抗弹性能随着强度升高而单调递增.强度进一步升高后钢板因产生与绝热剪切相关的损伤而失效,因而抗弹性能下降. 关键词:40CrNi2Mo钢; 塑性扩孔; 绝热剪切; 抗弹性能; 40CrNi2Mo steel; ductile hole enlargement; adiabatic shear; ballistic performance......
热挤压,冷扭转复合工艺制备钨合金的绝热剪切敏感性 孙常青1,郭伟2,倪芳2,郑海云1,李树奎2,刘金旭2 (1.国营121厂,黑龙江,牡丹江,157000;2.北京理工大学,北京,100081) 摘要:对烧结态93W-4.5Ni-2.1Fe-0-35Co钨合金进行热挤压变形强化,获得纤维组织,再通过冷扭转变形调整纤维状钨颗粒的取向,对压,扭复合工艺制备的钨合金进行动态雎缩性能测试和绝热剪切敏感性的分析,并与烧结态和冷扭转态钨合金作对比研究.结果表明,热压,冷扭复合工艺制备的钨合金在具备高屈服强度的同时,具备了较高的绝热剪切敏感性.微观分析表明,热压,冷扭复合工艺改变了条状粘结相组织的受力状态和分布状态,从而导致钨合金绝热剪切敏感性的提高. 关键词:钨合金; 绝热剪切; 纤维晶粒取向; 动态压缩; tungsten heavy alloy; adiabatic shear band......
