Is the direction of the positive principal strain defined by the counterclockwise?

Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
ChapterMA: Math Assessment
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Is the direction of the positive principal strain defined by the counterclockwise?

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The shear stress is considered as the positive when the pair of shear stresses acting on the opposite sides of the object in the anticlockwise direction.

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