How can convert shear stress to tensile stress?
For example if shear stress equals 78 MPa, what is the equivalent tensile stress?
Howdy Mohammad Moshkbar Bakhshayesh,
It looks to me as if you are really inquiring about sliding friction rather than shear stress. Sliding friction is a function of normal force and the coefficient of friction between the surfaces involved. If you were to look up sliding friction online or here on ResearchGate you could find formulas, etc. that you need. However, your background is such that you probably know that.
Normal stress and shear stress are very different. Normal stress is an applied force perpendicular to a surface, like the weight of a brick. Shear stress is normally used with fluids and occurs in the fluid when it flows over a surface with a no-slip condition so the velocity increases away from the surface. The variation of velocity is called shear and the exchange of momentum normal to the surface that causes that shear is shear stress. A similar affect may be seen with a deck of cards that shifts to an angle then one slides the top card parallel to a table, however, friction between the cards is sliding friction that causes the shear strain in that case and it is affected by normal stress on the top card. This is not important in fluids.
Shear stress and normal stress cannot be converted because they are so different, but if you want to relate sliding friction to normal stress the answer is readily available.
I hope I have not misunderstood your actual question,
Happy Trails, Len
Howdy Mohammad Moshkbar Bakhshayesh,
I was pleasantly surprised to see "tensile stress" instead of "normal stress" in your question this morning. Your ResearchGate profile mentions both a wear-resistant alloy and welds as topics on which you are working so relating tension in a weld to drag of an alloy sample during a wear test may be the problem, but that is a guess.
The force per unit area, 78 MPa, that you cite as "shear stress" should not be converted directly to the force per unit area of "tensile stress" because the areas involved are not related. The measure to use in a conversion would be the drag force that is the action-reaction fact. That force divided by the area under tension would give you the "tensile stress" on a weld.
Another sentence that describes the application would really help here.
Happy Trails, Len
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