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of total cemented backfilling (HTB) under dynamic loading, 50 mm×25 mm HTB specimen was prepared, the static uniaxial compression test and the split Hopkinson pressure bar (SHPB) uniaxial impact test... energy absorption performance. Key words: mining; high concentrations total tailing cemented backfilling; strain rate; split Hopkinson pressure bar (SHPB) test; dynamic mechanics performance 相对于空场法采矿,充填......
A NOVEL APPROACH FOR THE PREDICTION OF SURFACE PROFILE OF OUTGOING WORKPIECE AND THE CALCULATION OF MEAN ROLL RADIUS IN ALLOY BAR ROLLING Y.G. Dong1,W.Z. Zhang1,J.F. Song2 (1.College of Mechanical Engineering, Yanshan University, Qinhuangdao 066004, China;2.College of Electromechanical Engineering, Harbin Institute of Technology, Harbin 150001,China) Abstract:In alloy bar rolling process......
Parameter Optimization Study on Control of Distortion in Bright Bar Used In Rack Application Subjected To Induction Heat Treatment K.Palaniradja1,N.Alagumurthi1,V.Soundararajan1 (1.Department... machining operations. It was with these aims that investigations into the control of distortion in bright bar (EN 18D steel) used in rack application (Power steering assembly) have been carried out......
properties and failure rule of layered backfill under strain rates from 10 to 80 s-1, impact loading test on layered backfill specimens (LBS) was conducted by using split Hopkinson pressure bar system... (LBS); split Hopkinson pressure bar (SHPB); dynamic mechanical properties; damage characteristic; failure criterion 1 Introduction Due to the relatively low-level dilution ratio and flexibility, cut......
合金钢棒材生产线半连轧可逆式粗轧机主传动系统设计方案选择韩超1,宣永建1,周冶1,曹剑叶1(1.北京市中冶京诚工程技术有限公司 电气工程技术所)摘 要:根据合金钢棒材生产工艺的特点及粗轧机对传动系统的要求,结合作者多年设计和实践经验,介绍了半连轧可逆式粗轧机主传动系统设计时,如何选择变频装置,传动电动机,整流变压器,电源补偿装置,重点对比分析了三电平交-直-交变频装置和交-交变频装置的特点及性能价格,同步电动机和异步电动机的结构和性能参数以及无功补偿和谐波补偿的特点,最终给出了选择建议.关键词:合......
效斜压杆代替,从而整片墙体的极限荷载Vmax由等效斜压杆,水平条带,竖向芯柱所组成的抗剪抵抗机构共同承担,对应计算公式为 (6) 图10 刚架斜压杆模型 Fig. 10 Baroclinic bar model of rigid frame 式中:V1为水平条带内钢筋的抗剪承载力；V2为竖向芯柱提供的销栓力；V3为等效斜压杆承担的抗剪承载力. 4.2.1 水平条带内钢筋的抗剪承载力V1 根据......
J. Cent. South Univ. (2020) 27: 3464-3476 DOI: https://doi.org/10.1007/s11771-020-4559-8 Hydration process of rice husk ash cement paste and its corrosion resistance of embedded steel bar WANG Hui... steel bar [J]. Journal of Central South University, 2020, 27(11): 3464-3476. DOI: https://doi.org/10.1007/s11771-020-4559-8. 1 Introduction In China, billion tons rice husk is produced from agricultural......
distribution in a metal bar when its one end was heated. According to principle of hot expansion, a holograph of temperature distribution in the bar by laser holotechnique was taken. The results of numerical simulation and experiments are in good agreement and a new method for study on thermal conduction by laser holo-technique was found. Key words:metal bar; thermal conduction equation; computer......
试析露天矿运输能力和采装能力的合理匹配周卫华新疆雪峰爆破工程有限公司摘 要:本文针对露天矿运输能力和采装能力的合理匹配,结合理论实践,在简要阐述露天矿运输和采装研究现状的基础上,分析了运输能力和采装能力合理匹配的方法.得出统一生产调度系统,是实现露天矿运输设备行车路线最佳选择,减少车辆排队,提高采运设备生产效率关键的结论,希望对相关相关有一定帮助.关键词:露天矿;运输能力;采装能力;合理匹配;......
高强度建筑钢筋的最新技术进展杨才福1(1.北京市钢铁研究总院)摘 要:介绍了国内外高强度钢筋的发展历史,生产技术进展和发展趋势.微合金化,余热处理,细晶化是发展高强度钢筋的有效途径.在微合金化钢筋方面,V-N钢筋具有明显的技术经济优势;通过利用廉价的氮元素,促进了V(C,N)的析出,显著提高了V的沉淀强化效果,可节约钒用量50%,达到了节约贵重合金资源,降低生产成本的目的.余热处理钢筋和细晶粒钢筋通过组织强化或利用超细晶技术,在碳素钢和20MnSi钢的基础上获得了400 MPa的Ⅲ级钢筋和500 MPa的Ⅳ级钢......
