An ideal plastic substance indicates no deformation, when stressed upto yield stress, but behaves like a Newtonian fluid beyond yield stress. Which of the following is an ideal plastic ?

Correct answer: A. Sewage sludge

  • A. Sewage sludge
  • B. Rubber latex
  • C. Blood
  • D. Sugar solution

Explanation

Sewage sludge behaves as a Bingham or ideal plastic fluid: it requires a yield stress before flowing and then shows approximately Newtonian behaviour. Blood and latex are commonly non-Newtonian, while sugar solution is essentially Newtonian.

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