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: B. Sewage sludge
- A. Rubber latex
- B. Sewage sludge
- 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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