Journal of Materials Engineering and Performance

, Volume 12, Issue 5, pp 561–568 | Cite as

Ball indentation analysis of a tough polymer sheet

  • Malik M. Nazeer
  • M. Afzal Khan
  • A. Naeem
  • A. ul Haq


The ball indentation process of tough polymer sheet clamped at its periphery has various particular response characteristics. These characteristics of the polymer sheet have been discussed in comparison to the ductile metal sheet undergoing a similar indentation process. The ball indentation process of polymer sheet is also mathematically analyzed to evaluate fracture toughness and distribution of the energy used. This analysis is useful for designers to foresee the pre- and post-peak load response and possible aftermath. The information and results presented may be useful to meet some particular design and utility demands. Data for a number of tests was recorded and analyzed and it was observed that at a particular load and corresponding displacement, fracture first begins within the dimple. The fracture toughness and energy used were calculated using a mathematical model developed for computations. The energy-based equations of Rigid-Plastic Fracture Mechanics have been used for computational model for steel balls indentation, perforation, and fracture propagation. The dependence of various parameters on the indenting ball diameter and bearing of the anisotropy due to sheet extrusion is elaborated.


elasto-plastic flow fracture propagation fracture toughness perforation polymer indentation characteristics 


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Copyright information

© ASM International 2003

Authors and Affiliations

  • Malik M. Nazeer
    • 1
  • M. Afzal Khan
    • 1
  • A. Naeem
    • 1
  • A. ul Haq
    • 1
  1. 1.Dr. A.Q. Khan Research LaboratoriesRawalpindiPakistan

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