तन्य सामग्रियों (ductile materials) के लिए, निम्नलिखित में से किस विफलता सिद्धांत (failure theory) को सबसे उपयुक्त और सटीक माना जाता है?

In shaft design, maximum principal stress theory is reasonably applicable when the material is:

Which theory states that failure or yielding occurs at a specific location within a member when the maximum principal stress reaches the material's limiting strength as determined in a simple tension test?