For the peeps here, this is the convention in geomechanics. Tension is -ve and compression is +ve. If you are taking solid mechanic/mechanics of materials/strength of materials, the convention is the opposite.
This video only explains how to use the formulas related to soil mechanics. The theory on how to derive these equations can be found in textbooks on mechanics of materials.
You add 90 degrees to the 45 because that way you account from the total angle made from the original x-axis to the new position. In other words, to do these calculations, you rotate your unit coordiante system 45 degrees. Because you do that, you must add 90 to account for it. And remember that you rotate your coordinate system so that SigmaX is normal to the plane you are testing and Tau Y is parallel to it.
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The only video that made me understand how to find the angles! thank you
If anyone is having troubles with the way the angle is found, essentially you subtract whatever your angle is from 180
This helps a lot! Thank you sir!
For the peeps here, this is the convention in geomechanics. Tension is -ve and compression is +ve. If you are taking solid mechanic/mechanics of materials/strength of materials, the convention is the opposite.
normal stress is going towards the object, does not it suppose to be negative.
Compressive normal stresses are taken as positive in soil mechanics
thank you dr. ❤❤❤❤❤❤
I think sir this in case of tension not compression as (shown in video) so should the normal stress then be negative ?
Couldn't we use tensile as +ve and compression as -ve?
respect sir
could you explain the equations those how can be governed from?
This video only explains how to use the formulas related to soil mechanics. The theory on how to derive these equations can be found in textbooks on mechanics of materials.
I unable to understand that the direction taken by thita
Why is the degree 135 instead of 45?
This is just how the formula works
@@GeoEngineeringandScience Well that ain't very helpful. Understanding derivations of formulas helps students a lot.
You add 90 degrees to the 45 because that way you account from the total angle made from the original x-axis to the new position. In other words, to do these calculations, you rotate your unit coordiante system 45 degrees. Because you do that, you must add 90 to account for it. And remember that you rotate your coordinate system so that SigmaX is normal to the plane you are testing and Tau Y is parallel to it.
i must be doing something wrong because this does not work for me