• K Sivakumar

      Articles written in Bulletin of Materials Science

    • An equation of state for porous materials under shock loading

      N Ramakrishnan K Sivakumar

      More Details Abstract Fulltext PDF

      Based on the physical interpretation of the linear equation of state (EOS) of dense solids under shock loading, which relates particle and shock speeds asUs=Cb+gUp, the EOS for porous solids has been developed and is expressed asUs*=ΨCb*+g*Up whereCb* andg* are effective bulk sound speed and effective inverse ultimate volume strain respectively. Ψ is a pore collapse function introduced specially to differentiate loading and unloading behaviour.Cb* andg* are derived theoretically whereas Ψ is established empirically as Ψ=f(Up,Cb). This EOS does not call for any experimentally established material constant to describe the effect of porosity. Also its ability to describe the unloading behaviour distinguishes it from the presently available equations of state.

    • An expression for contact area between particles in a powder compact in terms of the porosity

      N Ramakrishnan K Sivakumar

      More Details Abstract Fulltext PDF

      An equation for contact area between powder particles in a powder compact, in terms of the porosity, has been derived using a geometry representing spherical voids of different sizes distributed in a material matrix. This equation is verified using experimental data as well as results obtained from computer simulation of powder compaction using a finite element method.

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    • Dr Shanti Swarup Bhatnagar for Science and Technology

      Posted on October 12, 2020

      Prof. Subi Jacob George — Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur, Bengaluru
      Chemical Sciences 2020

      Prof. Surajit Dhara — School of Physics, University of Hyderabad, Hyderabad
      Physical Sciences 2020

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      Posted on July 25, 2019

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