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Comparative Study of Different Materials with Al-Sic for Engine Valve Guide by Using FEM

World Journal of Engineering and Technology 2016年第2期4卷 238-251页

作者： hemendra kumar srivastva Arurendra Singh Chauhan Manmohan Kushwaha Amaan Raza Prashantkr Bhardwaj Vaibhav Raj Department of Mechanical Engineering Naraina Group of Institutions Kanpur India Department of Mechanical Engineering Maharana Pratap Engineering College Kanpur India

In this work, an effort has been designed to raise the reliability of engine using Al-Sic composites with other alternatively materials for the engine valve guides. Aluminum matrix composites have found the most suitable inside automotive, aerospace and aircraft industries and contain the greatest promise for future year’s growth. The finite element analysis of the Al-Sic composite with Titanium alloy (Ti-834), Copper Nickel Silicon alloys (CuNi3Si), and aluminum bronze alloy as an alternative material for engine valve guide was done using Ansys 13.0 software. The stress analysis of engine valve guide under the different pressure and temperature is considered, the pressure is taken as from 10 MPa to 100 MPa with different temperatures varying from 600℃ to 650℃. The temperature, principal stress and principal strain distribution on the entire surface area of the engine valve guide were obtained. The stresses were observed to be well below the permitted stress for all the materials but the Al-Sic composites found the most suitable one. Valve guide is modeled in pro-engineer software and analysis is carried out in Ansys 13.0. The deformations and stresses induced due to structural and thermal loading is illustrated and discussed.

关键词： Valve Guide Composite Materials FEM Deformation Von Mises Stress

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Magnesium based surface metal matrix composites by friction stir processing

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Journal of Magnesium and Alloys 2016年第1期4卷 52-61页

作者： B.Ratna Sunil G.Pradeep kumar Reddy hemendra Patle Ravikumar Dumpala Department of Mechanical Engineering Rajiv Gandhi University of Knowledge Technologies(AP-IIIT)Nuzvid 520202India Department of Mechanical Engineering Vignana Bharathi Institute of TechnologyHyderabad 501301India Department of Mechanical Engineering Visvesvaraya National Institute of TechnologyNagpur 440010India

Surface metal matrix composites(MMCs)are a group of modern engineered materials where the surface of the material is modified by dispersing secondary phase in the form of particles or fibers and the core of the material experience no change in chemical composition and *** potential applications of the surface MMCs can be found in automotive,aerospace,biomedical and power ***,friction stir processing(FSP)technique has been gaining wide popularity in producing surface composites in solid state *** and its alloys being difficult to process metals also have been successfully processed by FSP to fabricate surface *** aim of the present paper is to provide a comprehensive summary of state-of-the-art in fabricating magnesium based composites by *** of the secondary phase particles and grain refinement resulted from FSP on the properties of these composites is also discussed.

关键词： Surface composites Friction stir processing Hardness Light weight Magnesium alloys Biomedical implants

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Application of monorail fixator for femoral gap nonunion

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Chinese Journal of Traumatology 2014年第4期17卷 239-241页

作者： hemendra kumar Agrawal Ashish Jaiman Vipin Khatkar Vinod kumar Sharma Central Institute of Orthopedics VMMC & Safdarjung Hospital New Delhi 110029 India

Difficult femoral nonunion takes account of infective nonunion and aseptic gap *** length discrepancy and nonunion need to be tackled *** Ilizarov ring fixator is in vogue but it has some *** overcome these,monorail fixator is an effective *** good results can be obtained if we can get a perfect anatomical alignment and good regeneration.

关键词： Femur Ilizarov technique External fixators

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Cosmetic arm lengthening with monorail fixator

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Chinese Journal of Traumatology 2015年第3期18卷 170-174页

作者： hemendra kumar Agrawal Balvinder Singh Mohit Garg Vipin Khatkar Sumit Batra Vinod kumar Sharma Central Institute of Orthopaedics. Safdarjung Hospital New Delhi 110029 India

Upper limb length discrepancy is a rare occurrence. Humerus shortening may need specialized treatment to restore the functional and cosmetic status of upper limb. We report a case of humerus lengthening of 9 cm with a monorail external fixator and the result was observed during a 2-year follow-up. Humerus lengthening needs specialized focus as it is not only a cosmetic issue but also a functional demand. The monorail unilateral fixator is more functional and cosmetically acceptable, and thus becomes an effective treatment option.

关键词： Humerus External fixators Ilizarov technique Osteogenesis Distraction

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An unusual cause of radial nerve palsy

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Chinese Journal of Traumatology 2014年第3期17卷 175-177页

作者： hemendra kumar Agrawal Vipin Khatkar Mohit Garg Balvinder Singh Ashish Jaiman Vinod kumar Sharma Central Institute of Orthopedics VMMC andSafdarjung Hospital New Delhi 110029 India

Neurapraxia frequently occurs following traction injury to the nerve intraoperatively, leading to radial nerve palsy which usually recovers in 5-30 weeks. In our case, we had operated a distal one-third of humeral shaft fracture and fixed it with 4.5 mm limited contact dynamic compression plate. The distal neurovascular status of the limb was assessed postoperatively in the recovery room and was found to be intact and all the sensory-motor functions of the radial nerve were normal. On the second postoperative day, following the suction drain removal and dressing, patient developed immediate radial nerve palsy along with wrist drop. We reviewed the literature and found no obvious cause for the nerve palsy and concluded that it was due to traction injury to the radial nerve while removing the suction drain in negative pressure.

关键词： Radial nerve Humeral fractures Paralysis Diaphyses

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