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Forums
Engineering
Mechanical Engineering
Principal Stresses in a Shear Flow
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[QUOTE="Kushwoho44, post: 6371709, member: 418991"] Hi, I was thinking about principal stresses and unfortunately this is a bit of a dark spot for me in my education. I understand principal stresses as the stresses that are present when the co-ordinate system is oriented such that there are no shear stresses, and only normal stresses. As such, for a 2D system, there will two principal axis, which are orthogonal and one of these axis will contain the maximum stress and the other the minima. In the case of a solid under external forces, I can understand this situation. However, I am a bit confused in even a simple laminar viscous flow, say 2D in a pipe for simpilcity. I cannot visualise a co-ordinate system here where there will be no shear, as there is shear between the lamina of the material, so how can there be principal stresses and strains? Kind regards. [/QUOTE]
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Principal Stresses in a Shear Flow
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