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| 1 | 采用粉末冶金技术制备的空心微珠分散钛基复合材料的表征及磨损性能(英文)显示文摘采用粉末冶金技术制备空心微珠分散的钛基复合材料,并对其磨损和腐蚀行为进行研究.结果表明,所制备的复合材料组织中在α-Ti基体中分散有平均孔径为50~150 μm的空心微珠.复合材料的多孔性归因于压制过程中载荷对空心微珠颗粒的破坏及空心微珠本身的空心特性.X射线衍射分析表明复合材料由Al2O3、SiO2、TiO2和α-Ti相组成.基体钛合金的显微硬度为HV 240,而复合材料的显微硬度在HV 1100~HV 1800范围内变化.磨损实验表明,相对于商用Ti-6Al-4V合金,复合材料对硬化钢球和WC球的抗磨损性能得到显著增强.复合材料在3.56%NaCl(质量分数)溶液中的腐蚀行为表明,其耐点蚀性能改善,腐蚀电位向正(更高)方向移动.然而,与商用Ti-6Al-4V合金相比,空心微珠分散钛合金的腐蚀速率增大. | D.P.MONDAL J.D.MAJUMDAR M.D.GOEL G.GUPTA | 2014 | Transactions of Nonferrous Metals Society of China2014，24，5： | 1 |
| 2 | 采用粗空心微球低压粉末冶金法制备空心微球复合泡沫钛(英文)显示文摘在低压下采用粉末冶金法,使用粗尺寸空心微球制备出不同相对密度的钛空心微球复合泡沫材料。在压力为60~70 MPa,通过冷压制备得到不同相对密度的泡沫钛。研究冷压压力与空心微球破碎倾向和相对密度的函数关系。研究制备的泡沫钛材料的压缩变形行为,考虑到实际应用,建立了平台应力、弹性模量、致密化应变和能量吸收之间的经验关系。对比泡沫钛和致密钛的性能指标,发现在工程应用中泡沫钛是致密钛的优秀替代物。 | N.JHA D.P.MONDAL M.D.GOEL J.D.MAJUMDAR S.DAS O.P.MODI | 2014 | Transactions of Nonferrous Metals Society of China2014，24，1： | 1 |
| 3 | Effect of blast inside tunnel on surrounding soil mass,tunnel lining,and superstructure for varying shapes of tunnels显示文摘In this study,a finite element(FE)analysis of shallow tunnels exposed to a blast inside the tunnel,with soil as surrounding medium and a structure at ground level,was performed.The ConWep program,developed by the US Army,was used to simulate blast loading using ABAQUS/Explicit■.Drucker-Prager(D-P)plasticity model,concrete damage plasticity(CDP),and Johnson-Cook(J-C)plasticity models were used to define the behavior of the soil,concrete,and reinforcement,respectively.FE analysis was carried out to compare the damages to the superstructure with variation in the cross-sectional shapes of the tunnel under internal blast loading.Three tunnel shapes(circular,rectangular,and horseshoe cross-sections)were considered in the FE analysis.An explosive of 100 kg TNT was located at the center of the cross-section of the tunnel.The response of the tunnel in terms of displacement and stress at critical locations was computed.The results showed that changes in the cross-section of the tunnel affect the stability of the tunnel,even when keeping all other factors constant.It was observed that the intensity of the stresses was the highest for a rectangular tunnel and lowest for a circular tunnel.Furthermore,it was also determined that the tunnel with a rectangular cross-section experienced the maximum displacement in the reinforced concrete(RC)lining compared with the horseshoe and circular tunnels.The displacement measured at critical structural members of the superstructure was found to be the highest for the tunnel with a rectangular cross-section and lowest for the tunnel with a circular cross-section. | M.D.Goel Shivani Verma Jagriti Mandal Sandeep Panchal | 2021 | Underground Space2021，6，6： | 0 |
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