Answer: B - Brittle materials
The maximum normal stress theory is used for brittle materials.
As per maximum normal stress theory, “When the maximum principal stresses developed in a body exceed the material's uniaxial ultimate tensile/compressive strength (or yield strength), failure will occur.” This theory is also known as the “Rankine theory”.
In the case of brittle materials, tensile stresses are critical stresses because brittle materials are very weak in tension. That's why the maximum normal stress theory is used for brittle materials.
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