Analytical, numerical and experimental approach for design and development of optimal die profile for the cold extrusion of B4C DRMM Al 6061 composite billet into hexagonal section

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• 作者：R. Venkatesan (1)
  C. Venaktesh (2)
  
• 关键词：Stir casting ; Metal matrix composites ; Nanoindentation ; Upper bound technique ; DEFORM ; 3D ; Cosine profile die
• 刊名：Journal of Mechanical Science and Technology
• 出版年：2014
• 出版时间：December 2014
• 年：2014
• 卷：28
• 期：12
• 页码：5117-5127
• 全文大小：3,600 KB
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• 作者单位：R. Venkatesan (1)
  C. Venaktesh (2)
  
  1. Department of Mechanical Engineering, Sona College of Technology, Salem, 641659, Tamilnadu-st, India
  2. Department of Mechanical Engineering, Jansons Institute of Technology, Coimbatore, 641659, Tamilnadu-st, India
  
• 刊物类别：Engineering
• 刊物主题：Mechanical Engineering
  Structural Mechanics
  Control Engineering
  Industrial and Production Engineering
  
• 出版者：The Korean Society of Mechanical Engineers
• ISSN：1976-3824

文摘

Aluminium based matrix composites with boron carbide as particle reinforcement called Discontinuous reinforced metal matrix composites (DRMMs) possess high specific strength, high elastic modulus, good wear resistance, damping capacity and thermal stability. But during the development of DRMM composites, compression process like extrusion is an advisable secondary process for homogenous structure. This research work investigates the metal flow behavior of Al-B4C based DRMM composite through six different die profiles namely third order polynomial, fourth order polynomial, cosine, elliptical, hyperbolic and conical geometry. Extrusion load, stress and strain distribution, and metal flow for above said die profiles are predicted by using analytical approach upper bound technique and compared with finite element method. Cosine and third order polynomial profiles are found to be most optimal in terms of homogenous and minimal extrusion load requirement. To validate the results, specially made Al-B4C composite through stir casting route was extruded from round to hexagon through an exclusively fabricated cosine die. Results observed from the experiment have good agreement with both analytical and numerical.