When a fluid flows inside a pipe, it follows a general relation from which we can find the shear stress at pipe walls.
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Image credits : Wikipedia How to calculate shear stress at pipe wall?
K t = σ max/σ Image: Stress concentration at sharp corners We can calculate the strength of the work piece under stress concentration by using the relation below. So, stress concentration is not desirable as the holes and sharp edges will become the weakest part of the entire work piece. These weakens the work piece and has greater potential to fail. When the work piece has sharp edges or turns or holes in it, the stress get accumulated locally. These stresses are not distributed across the surface due to sudden change in cross section. I is the moment of inertia What is stress concentration? The formula for finding shear stress at a point is given below. To find shear stress at a particular point there is a different practice. Till now all the formulae that we have discusses are used for finding shear stress at the surface. How to calculate shear stress at a point? The formula to calculate the shear stress from torsion is discussed in above sections and the same is used while performing the torsion test. If the work piece breaks then it is said to fail the torsion test and if it survives without necking then it is said to pass the test. This test is performed to know whether work piece will work under specific torsional load conditions or not. This is the simplest practice to test the work piece under torsion. In this test, the ends of the work piece are twisted along the longitudinal axis of the work piece. To check the for the shear strength of the work piece under torsional load, torsion test is performed. Where mu is the dynamic viscosity How to calculate shear stress in torsion test?
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