Effect of hollow sphere size and size distribution on the quasi-static and high strain rate compressive properties of Al-A380l2O3 syntactic foams

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• 作者：Joseph A. Santa Maria (1)
  Benjamin F. Schultz (1)
  J. B. Ferguson (1)
  Nikhil Gupta (2)
  Pradeep K. Rohatgi (1)
  
• 刊名：Journal of Materials Science
• 出版年：2014
• 出版时间：February 2014
• 年：2014
• 卷：49
• 期：3
• 页码：1267-1278
• 全文大小：
• 作者单位：Joseph A. Santa Maria (1)
  Benjamin F. Schultz (1)
  J. B. Ferguson (1)
  Nikhil Gupta (2)
  Pradeep K. Rohatgi (1)
  
  1. Materials Science and Engineering Department, University of Wisconsin-Milwaukee, 3200 N Cramer St., Milwaukee, WI, 53201, USA
  2. Mechanical and Aerospace Engineering Department, Polytechnic Institute of New York University, 6 MetroTech Center, Brooklyn, NY, 11201, USA
  
• ISSN：1573-4803

文摘

Metal matrix syntactic foams are promising materials for energy absorption; however, few studies have examined the effects of hollow sphere dimensions and foam microstructure on the quasi-static and high strain rate properties of the resulting foam. Aluminum alloy A380 syntactic foams containing Al2O3 hollow spheres sorted by size and size range were synthesized by a sub-atmospheric pressure infiltration technique. The resulting samples were tested in compression at strain rates ranging from 103s1 using a conventional load frame to 1720s1 using a Split Hopkinson Pressure-bar test apparatus. It is shown that the quasi-static compressive stresstrain curves exhibit distinct deformation events corresponding to initial failure of the foam at the critical resolved shear stress and subsequent failures and densification events until the foam is deformed to full density. The peak strength, plateau strength, and toughness of the foam increases with increasing hollow sphere wall thickness to diameter (t/D) ratio. Since t/D was found to increase with decreasing hollow sphere diameter, the foams produced with smaller spheres showed improved performance. The compressive properties did not show measurable strain rate dependence.